7Baggers

Great Lakes Dredge & Dock Corporation
(NASDAQ:GLDD) 

GLDD stock logo

Great Lakes Dredge & Dock Corporation provides dredging services in the United States. The company engages in capital dredging that consists of port expansion projects, coastal restoration and land reclamations, trench digging for pipelines, tunnels and cables, and other dredging related to the cons...

Founded: 1890
Full Time Employees: 437
Sector: Industrials
Industry: Engineering & Construction

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Quarterly
Annual
    Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 
                                                                                
      contract revenues
    256,452,000 195,205,000 193,755,000 242,865,000 202,774,000 191,173,000 170,086,000 198,660,000 181,729,000 117,185,000 132,667,000 158,044,000 146,658,000 158,346,000 149,428,000 194,349,000 209,964,000 168,638,000 169,914,000 177,633,000 172,145,000 175,841,000 167,920,000 217,695,000 164,295,000 169,775,000 184,811,000 192,637,000 119,290,000 204,322,000 150,590,000 146,593,000 191,741,000 163,317,000 176,859,000 170,586,000 213,405,000 198,869,000 192,192,000 163,119,000 222,642,000 220,802,000 238,877,000 174,557,000 245,542,000 202,198,000 184,709,000 174,382,000 190,882,000 198,826,000 152,863,000 188,847,000 199,382,000 166,763,000 166,532,000 154,907,000 158,568,000 158,468,000 154,959,000 155,338,000 172,054,000 173,333,000 180,135,000 161,400,000 160,557,000 140,029,000 142,455,000 179,203,000 142,809,000 145,322,000 135,721,000 89,704,250 116,460,000 115,625,000 126,732,000  
      costs of contract revenues
    202,816,000 151,445,000 157,189,000 173,342,000 153,845,000 154,940,000 140,246,000 153,086,000 143,061,000 108,155,000 114,768,000 145,909,000 162,820,000 154,547,000 138,947,000 161,294,000 156,973,000 132,357,000 146,992,000 144,557,000 138,758,000 139,490,000 134,904,000 149,221,000 129,734,000 137,942,000 147,325,000 142,760,000 86,909,000 162,188,000 128,350,000 131,888,000 200,509,000 146,622,000 151,085,000 154,404,000 191,308,000 178,824,000 167,936,000 143,129,000 193,773,000 196,717,000 206,590,000 163,875,000 224,615,000 177,739,000 158,506,000 153,475,000 143,867,000 176,510,000 147,682,000 163,064,000 187,914,000 153,743,000 142,643,000 134,885,000 140,150,000 131,077,000 135,193,000 127,638,000 147,040,000 140,638,000 145,546,000 130,916,000 144,975,000 122,962,000 113,897,000 152,166,000 125,193,000 123,714,000 123,749,000 78,398,500 103,114,000 97,462,000 113,018,000  
      gross profit
    53,636,000 43,760,000 36,566,000 69,523,000 48,929,000 36,233,000 29,840,000 45,574,000 38,668,000 9,030,000 17,899,000 12,135,000 -16,162,000 3,799,000 10,481,000 33,055,000 52,991,000 36,281,000 22,922,000 33,076,000 33,387,000 36,351,000 33,016,000 68,474,000 34,561,000 31,833,000 37,486,000 49,877,000 32,381,000 42,134,000 22,240,000 14,705,000 -8,768,000 16,695,000 25,774,000 16,182,000 22,097,000 20,045,000 24,256,000 19,990,000 28,869,000 24,085,000 32,287,000 10,682,000 20,927,000 24,459,000 26,203,000 20,907,000 47,015,000 22,316,000 5,181,000 25,783,000 11,468,000 13,020,000 23,889,000 20,022,000 18,418,000 27,391,000 19,766,000 27,700,000 25,014,000 32,695,000 34,589,000 30,484,000 15,582,000 17,067,000 28,558,000 27,037,000 17,616,000 21,608,000 11,972,000 11,305,750 13,346,000 18,163,000 13,714,000  
      yoy
    9.62% 20.77% 22.54% 52.55% 26.54% 301.25% 66.71% 275.56% -339.25% 137.69% 70.78% -63.29% -130.50% -89.53% -54.28% -0.06% 58.72% -0.19% -30.57% -51.70% -3.40% 14.19% -11.92% 37.29% 6.73% -24.45% 68.55% 239.18% -469.31% 152.37% -13.71% -9.13% -139.68% -16.71% 6.26% -19.05% -23.46% -16.77% -24.87% 87.14% 37.95% -1.53% 23.22% -48.91% -55.49% 9.60% 405.75% -18.91% 309.97% 71.40% -78.31% 28.77% -37.73% -52.47% 20.86% -27.72% -26.37% -16.22% -42.85% -9.13% 60.53% 91.57% 21.12% 12.75% -11.55% -21.02% 138.54% 139.14% 31.99% 18.97% -12.70%      
      qoq
    22.57% 19.67% -47.40% 42.09% 35.04% 21.42% -34.52% 17.86% 328.22% -49.55% 47.50% -175.08% -525.43% -63.75% -68.29% -37.62% 46.06% 58.28% -30.70% -0.93% -8.15% 10.10% -51.78% 98.13% 8.57% -15.08% -24.84% 54.03% -23.15% 89.45% 51.24% -267.71% -152.52% -35.23% 59.28% -26.77% 10.24% -17.36% 21.34% -30.76% 19.86% -25.40% 202.26% -48.96% -14.44% -6.66% 25.33% -55.53% 110.68% 330.73% -79.91% 124.83% -11.92% -45.50% 19.31% 8.71% -32.76% 38.58% -28.64% 10.74% -23.49% -5.48% 13.47% 95.64% -8.70% -40.24% 5.63% 53.48% -18.47% 80.49% 5.89% -15.29% -26.52% 32.44%   
      general and administrative expenses
    20,901,000 17,553,000 19,478,000 20,038,000 18,682,000 19,815,000 16,161,000 16,111,000 15,389,000 14,188,000 14,462,000 13,017,000 12,401,000 13,292,000 10,820,000 14,604,000 16,421,000 15,167,000 14,224,000 16,322,000 17,494,000 14,888,000 14,804,000 15,571,000 16,184,000 13,488,000 14,613,000 14,825,000 6,702,000 17,293,000 15,169,000 15,944,000 16,747,000 17,522,000 17,267,000 16,795,000 18,506,000 7,187,000 19,751,000 20,089,000 22,301,000 15,277,000 15,543,000 17,948,000 18,061,000 16,062,000 15,918,000 17,870,000 11,322,000 19,219,000 18,311,000 19,187,000 17,069,000 11,667,000 11,456,000 13,267,000 11,987,000 12,736,000 13,622,000 12,089,000 12,591,000 16,535,000 14,266,000 10,960,000 11,475,000 11,755,000 11,591,000 10,399,000 10,971,000 11,248,000 10,154,000 6,684,250 9,528,000 9,217,000 7,993,000  
      other gains
    122,000 -1,936,000  -460,000 -799,500 -276,000 -906,000 -2,016,000                                                                     
      operating income
    32,613,000 28,143,000 17,087,000 49,945,000 30,047,000 16,694,000 14,585,000 31,479,000 -576,750 -5,123,000 3,680,000 -864,000 2,244,250 -9,453,000 -342,000 18,772,000 11,722,250 21,405,000 8,836,000 16,648,000 23,621,250 23,186,000 18,251,000 53,048,000 18,984,250 18,372,000 22,792,000 34,773,000 7,620,750 23,389,000 8,134,000 -1,040,000 1,678,000 -1,002,000 8,338,000 -624,000 4,147,250 12,860,000 3,818,000 -89,000 4,105,750 9,692,000 13,989,000 -7,258,000 5,290,250 8,007,000 10,269,000 2,885,000 -2,138,250 6,243,000 -21,390,000 6,594,000 5,193,250 1,461,000 12,526,000 6,786,000 9,763,500 14,786,000 8,657,000 15,611,000 13,921,000 16,055,000 20,215,000 19,414,000 9,584,500 5,119,000 16,774,000 16,445,000 6,468,000 10,295,000 1,752,000 4,548,000 3,726,000 8,812,000 5,654,000  
      yoy
    8.54% 68.58% 17.15% 58.66% -5309.71% -425.86% 296.33% -3743.40% -125.70% -45.81% -1176.02% -104.60% -80.85% -144.16% -103.87% 12.76% -50.37% -7.68% -51.59% -68.62% 24.43% 26.20% -19.92% 52.56% 149.11% -21.45% 180.21% -3443.56% 354.16% -2434.23% -2.45% 66.67% -59.54% -107.79% 118.39% 601.12% 1.01% 32.69% -72.71% -98.77% -22.39% 21.04% 36.23% -351.58% -347.41% 28.26% -148.01% -56.25% -141.17% 327.31% -270.76% -2.83% -46.81% -90.12% 44.69% -56.53% -29.86% -7.90% -57.18% -19.59% 45.24% 213.64% 20.51% 18.05% 48.18% -50.28% 857.42% 261.59% 73.59% 16.83% -69.01%      
      qoq
    15.88% 64.70% -65.79% 66.22% 79.99% 14.46% -53.67% -5558.00% -88.74% -239.21% -525.93% -138.50% -123.74% 2664.04% -101.82% 60.14% -45.24% 142.25% -46.92% -29.52% 1.88% 27.04% -65.60% 179.43% 3.33% -19.39% -34.45% 356.29% -67.42% 187.55% -882.12% -161.98% -267.47% -112.02% -1436.22% -115.05% -67.75% 236.83% -4389.89% -102.17% -57.64% -30.72% -292.74% -237.20% -33.93% -22.03% 255.94% -234.92% -134.25% -129.19% -424.39% 26.97% 255.46% -88.34% 84.59% -30.50% -33.97% 70.80% -44.55% 12.14% -13.29% -20.58% 4.13% 102.56% 87.23% -69.48% 2.00% 154.25% -37.17% 487.61% -61.48% 22.06% -57.72% 55.85%   
      interest expense—net
    -3,527,000 -4,558,000 -4,215,000 -4,451,000 -4,903,000 -4,888,000 -4,198,000 -3,891,000 -2,818,000 -2,762,000 -3,175,000 -3,385,000 -2,750,000 -3,551,000 -3,424,000 -4,025,000 -4,364,250 -4,214,000 -6,657,000 -6,586,000 -5,018,500 -6,719,000 -6,725,000 -6,630,000 -5,268,500 -6,335,000 -7,188,000 -7,551,000 -6,429,750 -8,062,000 -8,997,000 -8,660,000 -4,610,000 -6,417,000 -6,441,000 -5,582,000 -4,110,750 -4,819,000 -5,903,000 -5,721,000 -4,622,500 -7,293,000  -5,630,000 -5,237,000 -4,702,000 -5,012,000 -5,016,000 -5,270,000 -5,542,000 -5,396,000 -5,733,000 -5,175,000 -5,105,000 -5,383,000 -5,259,000                     
      other income
    -37,000 264,000 246,000 -368,000 -293,000 200,000 128,000 425,000 60,000 -78,000 2,024,000 227,000 -444,500 -253,000 -1,120,000 -405,000 302,000 -204,000 755,000 141,000 1,510,000 156,000 565,000 -1,121,000 44,000 -22,000 123,000 172,000 -702,000 165,000  -2,916,000    208,000 -479,500 -637,000   -88,250 706,000 -618,000 -441,000 -200,000 384,000                               
      income before income taxes
    18,227,000 23,849,000 13,118,000 45,126,000 24,851,000 12,006,000 10,515,000 28,013,000 27,768,000 -7,963,000 2,529,000 -4,022,000 -950,250 -13,257,000 -4,886,000 14,342,000 7,531,000 16,987,000 2,934,000 10,203,000                 -438,250 7,410,000 -2,475,000 -6,688,000         -6,293,750 1,950,000 -27,432,000 307,000 -10,535,000 -3,507,000 7,114,000 1,517,000 9,971,000 9,277,000 3,623,000 3,925,000 8,879,000 12,834,000 17,089,000 15,472,000 21,000 2,040,000 12,035,000 11,621,000 2,228,000 5,366,000  1,416,750 1,163,000 2,858,000 1,646,000  
      income tax provision
    -5,593,000 -6,125,000 -3,423,000 -11,710,000   -2,842,000         -3,285,000 -1,349,750 -3,181,000 -829,000 -1,389,000 -4,629,250 -4,076,000 -3,131,000 -11,310,000 -3,570,000 -3,204,000                     -2,097,000        -2,768,000 -564,000 -1,650,000 -3,618,000 -1,455,000 -1,527,000 -4,526,750 -5,113,000 -6,755,000 -6,239,000             
      net income
    12,634,000 17,724,000 9,695,000 33,416,000 19,716,000 8,852,000 7,673,000 21,024,000 21,558,000 -6,154,000 1,733,000 -3,231,000 -721,500 -9,910,000 -4,033,000 11,057,000 24,707,000 13,806,000 2,105,000 8,814,000 10,609,000 12,547,000 8,960,000 33,987,000 15,973,000 7,952,000 8,246,000 17,168,000 351,750 11,702,000 -974,000 -9,321,000 -5,606,750 -4,945,000 -694,000 -16,788,000 -298,500 4,560,000 -1,719,000 -4,035,000 -1,338,500 312,000 2,724,000 -8,390,000 19,013,000 -2,086,000 -1,437,000 -5,195,000 -11,482,000 1,266,000 -25,188,000 411,000 -6,487,000 -2,152,000 4,346,000 953,000 7,026,000 5,659,000 2,168,000 2,398,000 6,432,000 7,721,000 10,334,000 9,233,000 -275,000 1,155,000 7,404,000 6,450,000 1,401,000 2,930,000 -1,180,000 821,750 644,000 1,679,000 964,000  
      yoy
    -35.92% 100.23% 26.35% 58.94% -8.54% -243.84% 342.76% -750.70% -3087.94% -37.90% -142.97% -129.22% -102.92% -171.78% -291.59% 25.45% 132.89% 10.03% -76.51% -74.07% -33.58% 57.78% 8.66% 97.97% 4441.01% -32.05% -946.61% -284.19% -106.27% -336.64% 40.35% -44.48% 1778.31% -208.44% -59.63% 316.06% -77.70% 1361.54% -163.11% -51.91% -107.04% -114.96% -289.56% 61.50% -265.59% -264.77% -94.29% -1363.99% 77.00% -158.83% -679.57% -56.87% -192.33% -138.03% 100.46% -60.26% 9.24% -26.71% -79.02% -74.03% -2438.91% 568.48% 39.57% 43.15% -119.63% -60.58% -727.46% 684.91% 117.55% 74.51% -222.41%      
      qoq
    -28.72% 82.82% -70.99% 69.49% 122.73% 15.37% -63.50% -2.48% -450.31% -455.11% -153.64% 347.82% -92.72% 145.72% -136.47% -55.25% 78.96% 555.87% -76.12% -16.92% -15.45% 40.03% -73.64% 112.78% 100.87% -3.57% -51.97% 4780.74% -96.99% -1301.44% -89.55% 66.25% 13.38% 612.54% -95.87% 5524.12% -106.55% -365.27% -57.40% 201.46% -529.01% -88.55% -132.47% -144.13% -1011.46% 45.16% -72.34% -54.76% -1006.95% -105.03% -6228.47% -106.34% 201.44% -149.52% 356.03% -86.44% 24.16% 161.02% -9.59% -62.72% -16.69% -25.29% 11.92% -3457.45% -123.81% -84.40% 14.79% 360.39% -52.18% -348.31% -243.60% 27.60% -61.64% 74.17%   
      basic earnings per share
    0.19 0.27 0.15 0.5 0.29 0.13 0.11 0.32   0.03 -0.05 -0.01 -0.15 -0.06 0.17 0.37 0.21 0.03 0.14 0.16 0.19 0.14 0.53 0.26 0.12 0.13 0.28 0.005 0.19   -0.093 -0.08   -0.005 0.08 -0.03    0.05                          0.02 0.05 -0.02 0.018 0.01    
      basic weighted-average shares
    66,869 66,684 66,698 67,376 67,085 67,217 67,118 66,729 66,469 66,532 66,462 66,264 66,051 66,111 66,071 65,847 65,587 65,691 65,646 65,269 64,743 64,860 64,864 64,455 63,597 63,861 63,605 62,882 62,236 62,358 62,267 61,815 61,365 61,462 61,342 61,065 60,744 60,811 60,711 60,507 60,410 60,496 60,473 60,265 59,938 60,040 59,863 59,708 59,495 59,526 59,436 59,369 59,195 59,253 59,171 59,038 58,891 58,930 58,875 58,785 58,647 58,698 58,602 58,548 58,507 58,506 58,499  58,473 58,464 58,460  56,265    
      diluted earnings per share
    0.18 0.26 0.14 0.49 0.29 0.13 0.11 0.31   0.03 -0.05 -0.01 -0.15 -0.06 0.17 0.38 0.21 0.03 0.13 0.16 0.19 0.14 0.52 0.25 0.12 0.13 0.27 0.005 0.18   -0.093 -0.08   -0.005 0.08 -0.03    0.05                          0.02 0.05 -0.02 0.018 0.01    
      diluted weighted-average shares
    67,747 67,347 67,185 68,399 67,847 67,830 67,697 67,494 66,957 66,532 66,805 66,264 66,051 66,111 66,071 66,436 66,301 66,311 66,137 66,159 65,872 65,894 65,758 65,717 65,042 65,071 64,990 64,569 63,607 63,260 62,267 61,815 61,365 61,462 61,342 61,065 60,744 61,526 60,711 60,507 60,410 60,841 60,924 60,265 60,522 60,040 60,538 59,708 60,101 60,082 59,436 60,017 59,195 59,253 59,534 59,434 59,230 59,161 59,184 59,237 58,871 58,901 58,781 58,703 58,612 58,688 58,554  58,499 58,470 58,460  57,190    
      other losses
      1,000                                                                          
      income tax benefit
        -5,135,000 -3,154,000  -6,989,000 -6,210,000 1,809,000 -796,000 791,000 8,445,000 3,347,000 853,000            -4,230,000 -6,846,000 -137,250 -3,790,000 -54,000 3,295,000 29,498,000 2,714,000 1,124,000 2,274,000 5,233,000 -2,850,000 756,000 2,653,000 -334,000 -742,000 -2,464,000 6,037,000 11,105,000 1,069,000  1,453,000 416,000 -684,000 2,244,000 104,000 4,048,000 1,355,000                       
      gain on sale of assets—net
            -74,000 -35,000  -18,000 -89,500 -40,000   -80,750 -291,000 -138,000                     -10,000         -2,687,000 -3,146,000   -333,000 -108,000 -93,000 -31,000                     
      basic loss per share
            -0.03 -0.09                     -0.02 -0.15   -0.02 -0.27    -0.07 -0.023   -0.14                                 
      diluted loss per share
            -0.03 -0.09                     -0.02 -0.15   -0.02 -0.27    -0.07 -0.023   -0.14                                 
      loss on sale of assets—net
              -243,000    3,000 -321,000    106,000 -46,000  -39,000 -145,000 805,000 -27,000 81,000 279,000 3,541,000 1,452,000 -1,063,000 -199,000 4,722,000 175,000 169,000 11,000 5,500,000 -2,000 687,000     -8,000 139,500 390,000 16,000 152,000   58,000 2,000                         
      proceeds from loss of use claim
                        -430,750 -1,723,000                           -100,000  -13,272,000                          
      income from continuing operations before income taxes
                        12,279,000 16,623,000 12,091,000 45,297,000 15,785,000 12,015,000 15,727,000 27,394,000 14,497,000 15,492,000   -3,960,500 -7,659,000       -2,046,250 1,054,000 5,188,000  9,213,000 -2,096,000 5,980,000 -3,909,000                             
      income from continuing operations
                        10,609,000 12,547,000 8,960,000 33,987,000 14,812,000 8,811,000 11,497,000 20,548,000 9,609,000 11,702,000   -2,432,500 -4,945,000       -1,338,500 312,000 2,724,000  20,318,000 -1,027,000 3,883,000 -2,456,000                             
      loss from discontinued operations, net of income taxes
                            -1,872,500 -859,000 -3,251,000 -3,380,000     -3,174,250   -13,065,000         -2,279,500 -1,059,000 -5,320,000 -2,739,000                             
      basic earnings per share attributable to continuing operations
                        0.215 0.19 0.14 0.53 0.16 0.14 0.18 0.33 0.005 0.19   -0.04 -0.08       -0.023  0.05  0.003 -0.01 0.06 -0.04                             
      basic loss per share attributable to discontinued operations, net of tax
                            -0.03 -0.02 -0.05 -0.05     -0.053   -0.21         -0.038 -0.02 -0.08 -0.05                             
      diluted earnings per share attributable to continuing operations
                        0.21 0.19 0.14 0.52 0.158 0.14 0.18 0.32 0.005 0.18   -0.04 -0.08       -0.023  0.05  0.003 -0.01 0.06 -0.04                             
      diluted loss per share attributable to discontinued operations, net of tax
                            -0.03 -0.02 -0.05 -0.05     -0.053   -0.21         -0.038 -0.02 -0.08 -0.05                             
      equity in earnings of joint ventures
                                    -360,250 26,000 -1,468,000 1,000 4,750 6,000 128,000      11,958,000 -5,785,000   756,000 1,427,000   -29,000 177,000   -27,000 606,000   -193,000 81,000    163,000   61,000 55,000 134,000 422,250 790,000 637,000 262,000  
      loss on extinguishment of debt
                                    -582,500  -2,330,000                         -5,145,000                 
      equity in loss of joint ventures
                                           -115,000 -1,441,250 -2,051,000 -2,616,000 -1,098,000   -1,435,000 -1,843,000   -385,000 -590,000   -8,000 -16,000   -123,000 -591,000   -131,000 -722,000             
      other expense
                                  -57,000  -85,750 -266,000 -285,000    -518,000 -763,000                                     
      loss from continuing operations before income taxes
                                  -920,000 -12,616,000   -2,186,000 -5,997,000        -14,427,000                                 
      loss from continuing operations
                                  -974,000 -9,321,000   -1,062,000 -3,723,000        -8,390,000                                 
      income from discontinued operations, net of income taxes
                                      368,000                                          
      basic loss per share attributable to continuing operations
                                  -0.02 -0.15   -0.02 -0.06        -0.14                                 
      diluted loss per share attributable to continuing operations
                                  -0.02 -0.15   -0.02 -0.06        -0.14                                 
      impairment of goodwill
                                              2,750,000      5,368,500  21,474,000                          
      (gain) loss on sale of assets—net
                                            -221,750 -884,000                                   
      gain on bargain purchase acquisition
                                                  2,197,000                              
      loss on sale of assets — net
                                              5,000                                  
      interest expense — net
                                              -5,567,000                                  
      net loss attributable to noncontrolling interest
                                                                                
      net income attributable to common stockholders of great lakes dredge & dock corporation
                                                19,013,000 -2,086,000  -5,195,000                             
      basic earnings per share attributable to great lakes dredge & dock corporation
                                                -0.035 -0.03  -0.09 -0.098 0.02 -0.42 0.01 -0.11 -0.04 0.07 0.02 0.12 0.1 0.03 0.04 0.12 0.13 0.18 0.16 0.02 0.03 0.13          
      diluted earnings per share attributable to great lakes dredge & dock corporation
                                                -0.035 -0.03  -0.09 -0.098 0.02 -0.42 0.01 -0.11 -0.04 0.07 0.02 0.12 0.09 0.03 0.04 0.12 0.13 0.18 0.16 0.02 0.03 0.13          
      gain on foreign currency transactions—net
                                                  -39,000 65,000    36,000    6,000                     
      net income attributable to noncontrolling interest
                                                                                
      net loss attributable to common stockholders of great lakes dredge & dock corporation
                                                  -1,437,000                              
      basic loss per share attributable to great lakes dredge & dock corporation
                                                  -0.02                              
      diluted loss per share attributable to great lakes dredge & dock corporation
                                                  -0.02                              
      loss on foreign currency transactions—net
                                                    52,000 -178,000 -261,000  -63,000 -40,000 -21,000                      
      net loss attributable to noncontrolling interests
                                                    37,750 182,000 -53,000 22,000    115,000 -198,000 -57,000 -462,000 -6,000   474,000 93,000 1,303,000 540,000 27,000 864,000         
      net income attributable to great lakes dredge & dock corporation
                                                    -5,840,000 1,448,000 -25,241,000 433,000 843,250 -2,132,000 4,437,000 1,068,000 2,425,000 5,602,000 1,706,000 2,392,000 6,954,750 7,685,000 10,808,000 9,326,000 4,110,000 1,695,000 7,431,000 7,314,000         
      dividends declared per share
                                                        0.015 0.02 0.02 0.02 0.015 0.02 0.02 0.02 0.013 0.02 0.02 0.02   0.02          
      net (income) loss attributable to noncontrolling interests
                                                        419,000 20,000 91,000      132,750 -36,000               
      gain on sale of assets
                                                            -725,500 -131,000 -2,513,000                  
      interest expense
                                                            -4,108,000 -5,571,000 -4,911,000 -5,950,000 -2,379,250 -3,302,000 -2,995,000 -3,220,000             
      loss on foreign currency transactions
                                                            -136,000 -544,000                   
      amortization of intangible assets
                                                                80,750 105,000 108,000 110,000 194,000 193,000 193,000 193,000 177,000 65,000 66,000 49,250 66,000 65,000 65,000  
      basic and diluted earnings per share attributable to great lakes dredge & dock corporation
                                                                       0.13         
      basic and diluted weighted-average shares
                                                                       58,488         
      minority interest
                                                                                
      subpoena-related expenses
                                                                           24,250 26,000 69,000 2,000  
      income tax (provision) benefit
                                                                          733,000      
      minority interests
                                                                           750 22,000    
      redeemable preferred stock dividends
                                                                                
      net income available to common shareholders
                                                                           821,750 644,000    
      income tax expense
                                                                                
      redeemable preferred stock
                                                                                
      net income (loss) available to common stockholders
                                                                             1,679,000   
      basic earnings (loss) per share
                                                                             0.04 0.02  
      basic weighted average shares
                                                                             40,989 39,633  
      diluted earnings (loss) per share
                                                                             0.03 0.02  
      diluted weighted average shares
                                                                             48,238 44,697  
      net income (loss) available to common shareholders
                                                                              964,000  
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 
                                                                                  
        assets
                                                                                  
        current assets:
                                                                                  
        cash and cash equivalents
      13,361,000 12,671,000 2,925,000 11,336,000 10,216,000 12,037,000 23,134,000 22,802,000 22,841,000 14,093,000 42,066,000 32,519,000 6,546,000 38,833,000 75,420,000 142,583,000 145,459,000 173,838,000 180,767,000 177,708,000 216,510,000 229,725,000 233,527,000 207,474,000 186,995,000 180,855,000 125,575,000 122,986,000 34,458,000 23,127,000 13,538,000 12,736,000 15,852,000 10,469,000 12,643,000 6,895,000 11,167,000 13,595,000 21,236,000 15,894,000 14,184,000 9,421,000 14,696,000 30,619,000 42,389,000 21,088,000 38,067,000 58,695,000 75,338,000 41,322,000 21,623,000 6,643,000 24,440,000 38,324,000 70,791,000 85,618,000 113,288,000 107,050,000 95,997,000 104,529,000 48,478,000 79,031,000 52,802,000 20,925,000 3,250,000 11,939,000 9,624,000 6,287,000 11,523,000 4,790,000 11,532,000      
        accounts receivable—net
      70,169,000 109,321,000 111,087,000 113,302,000 118,030,000 42,506,000 56,279,000 40,482,000 54,810,000 30,342,000 43,036,000 32,652,000 44,890,000 68,670,000 69,325,000 37,162,000 82,953,000 43,687,000 35,741,000 65,732,000 38,990,000 47,218,000 33,894,000 44,014,000 19,785,000 31,043,000 50,767,000 34,494,000 64,779,000 86,665,000 82,306,000 97,441,000 75,533,000 79,336,000 61,957,000 91,385,000 88,091,000 115,753,000 110,940,000 101,000,000 130,777,000 143,884,000  75,348,000 113,188,000 98,118,000 74,906,000 65,507,000 96,515,000 143,437,000 149,940,000 141,250,000 149,142,000 134,244,000 112,897,000 119,860,000 120,268,000    95,548,000    153,901,000           89,505,000 
        contract revenues in excess of billings
      81,110,000 50,340,000 59,182,000 78,964,000 74,197,000 91,799,000 70,509,000 68,761,000 68,735,000 49,290,000 43,206,000 81,302,000 65,922,000 61,638,000 62,615,000 74,535,000 39,844,000 33,344,000 34,556,000 28,918,000 32,106,000 20,588,000 20,436,000 37,080,000 22,560,000 25,383,000 31,159,000 16,415,000 17,953,000 36,151,000 55,003,000 55,122,000 90,788,000 82,642,000 90,830,000 75,696,000 95,012,000 75,843,000 74,915,000 74,576,000 81,195,000 66,759,000 116,552,000 102,002,000 82,557,000 85,628,000 89,070,000 93,061,000 67,432,000 83,759,000 71,842,000 73,916,000 69,574,000 62,146,000 50,889,000 34,420,000 26,412,000 25,735,000 27,120,000 20,897,000 24,842,000 17,662,000 13,137,000 18,431,000 28,004,000 37,576,000 39,727,000 44,780,000 26,510,000 25,650,000 21,939,000  7,360,000 5,575,000 5,823,000 9,561,000 
        inventories
      27,926,000 27,045,000 26,592,000 26,078,000 29,866,000 34,961,000 31,952,000 32,038,000 33,912,000 32,295,000 32,068,000 28,682,000 29,229,000 27,302,000 31,132,000 30,394,000 30,760,000 30,427,000 32,758,000 33,756,000 34,689,000 32,980,000 30,377,000 29,440,000 30,189,000 27,547,000 27,477,000 26,629,000 28,112,000 32,004,000 32,340,000 33,052,000 34,600,000 35,540,000 35,770,000 38,307,000 37,137,000 35,734,000 35,053,000 35,042,000 35,963,000 37,250,000 34,205,000 32,870,000 34,735,000 33,194,000 33,643,000 34,707,000 32,500,000 32,321,000 30,578,000 26,629,000 28,726,000 36,511,000 48,696,000 33,595,000 33,426,000 32,398,000 31,464,000 30,767,000 31,734,000 29,979,000 29,494,000 28,791,000 29,192,000 29,550,000 30,131,000 27,457,000 30,776,000 33,879,000 30,156,000  29,596,000 21,509,000 26,647,000 21,082,000 
        prepaid expenses
      3,067,000 2,284,000 1,721,000 2,288,000 2,828,000 1,441,000 2,258,000 2,025,000 1,486,000    1,568,000    2,017,000    3,091,000    1,525,000    4,710,000    5,183,000    12,407,000    7,924,000    4,708,000    4,211,000    9,554,000    3,979,000 2,703,000 2,787,000 3,433,000 3,448,000 3,049,000 2,854,000 3,080,000 2,644,000 2,850,000 2,218,000 4,654,000 5,282,000 9,530,000 9,173,000     11,810,000 
        other current assets
      21,810,000 28,183,000 20,465,000 25,652,000 28,281,000 31,988,000 35,134,000 45,070,000 44,544,000    34,686,000    26,399,000    37,307,000    39,658,000    31,907,000    40,228,000    63,412,000    59,690,000    64,667,000    39,953,000    32,254,000    28,405,000 28,747,000 30,580,000 23,592,000 18,919,000 14,568,000 13,302,000 12,607,000 15,445,000 17,108,000 16,471,000 17,898,000 29,089,000 30,635,000 25,539,000     18,648,000 
        total current assets
      217,443,000 229,844,000 221,972,000 257,620,000 263,418,000 214,732,000 219,266,000 211,178,000 226,328,000 167,935,000 190,358,000 208,590,000 182,841,000 232,779,000 283,120,000 328,042,000 327,432,000 314,417,000 323,152,000 349,677,000 362,693,000 364,731,000 347,836,000 350,308,000 300,712,000 296,454,000 266,712,000 250,667,000 206,698,000 217,358,000 224,134,000 239,284,000 262,184,000 255,971,000 255,399,000 292,121,000 307,226,000 319,266,000 318,251,000 298,497,000 329,733,000 334,185,000 339,775,000 320,482,000 342,244,000 296,468,000 294,700,000 324,204,000 361,053,000 357,706,000 324,186,000 288,917,000 313,690,000 322,224,000 326,205,000 315,046,000 325,778,000 306,677,000 296,100,000 296,961,000 222,969,000 250,541,000 246,556,000 210,186,000 232,436,000 223,156,000 229,694,000 260,314,000 202,143,000 206,249,000 190,929,000  199,868,000 144,927,000 165,358,000 154,246,000 
        property and equipment—net
      803,289,000 781,039,000 757,924,000 704,026,000 703,252,000 681,552,000 653,283,000 613,116,000 614,608,000 606,288,000 570,178,000 561,757,000 543,910,000 517,839,000 495,220,000 468,555,000 455,102,000 431,856,000 422,552,000 400,723,000 383,042,000 372,847,000 374,327,000 371,884,000 374,596,000 374,798,000 376,635,000 368,600,000 369,863,000 365,491,000 371,807,000 381,762,000 407,294,000 413,612,000 416,058,000 419,268,000 413,008,000 436,691,000 416,484,000 432,749,000 430,210,000 423,157,000  418,839,000 399,445,000 382,331,000 366,271,000 356,986,000 345,620,000 358,350,000 355,854,000 347,740,000 346,540,000 313,383,000 316,460,000 310,810,000 310,520,000    323,231,000    291,157,000           239,337,000 
        operating lease assets
      76,266,000 67,137,000 71,339,000 83,186,000 96,099,000 66,522,000 74,670,000 81,633,000 88,398,000 72,801,000 79,112,000 85,527,000 89,733,000 86,158,000 77,449,000 63,345,000 62,233,000 52,100,000 52,777,000 57,687,000 65,188,000 66,148,000 71,316,000 81,319,000 72,612,000 72,039,000 74,684,000 76,594,000                                                 
        goodwill
      76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000 76,576,000    76,576,000    83,576,000    83,576,000    83,576,000    86,326,000    79,326,000    100,799,000    98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 98,049,000 97,799,000 97,799,000 96,225,000  97,447,000 97,447,000 97,447,000 98,747,000 
        inventories—noncurrent
      97,645,000 100,295,000 100,155,000 97,268,000 95,269,000 84,016,000 86,905,000 89,746,000 86,325,000 87,294,000 82,546,000 84,321,000 80,044,000 82,149,000 73,205,000 71,117,000 65,049,000 63,833,000 61,578,000 62,725,000 58,413,000 61,416,000 65,671,000 64,090,000 61,126,000 63,007,000 63,199,000 62,466,000 61,264,000 56,821,000 55,200,000 54,906,000 54,023,000 57,597,000 55,460,000 51,995,000 52,602,000 48,706,000 46,867,000 45,170,000 41,646,000 37,508,000  36,555,000 36,262,000 37,324,000 38,568,000 36,707,000 38,496,000 37,812,000 35,762,000 36,423,000 37,392,000 37,354,000 23,206,000 31,803,000 30,103,000    27,128,000    27,662,000            
        other
      14,530,000 12,848,000 13,684,000 14,772,000 20,489,000 21,941,000 16,967,000 22,839,000 18,605,000 9,396,000 8,826,000 8,224,000 8,676,000 8,019,000 9,580,000 11,204,000 11,278,000 12,004,000 12,998,000 12,594,000 9,212,000 8,777,000 8,372,000 7,732,000 7,960,000 9,894,000 11,325,000 16,948,000 10,760,000 12,588,000 12,473,000 17,546,000 13,128,000 13,967,000 14,007,000 14,442,000 21,644,000 8,366,000 7,470,000 7,181,000 10,271,000 11,902,000 12,209,000 12,225,000 12,105,000 11,745,000 9,147,000 10,517,000 9,062,000 13,353,000 13,505,000 17,509,000 17,695,000 17,983,000 18,461,000 16,241,000 16,273,000 11,955,000 17,527,000 16,963,000 11,839,000 6,682,000 6,778,000 6,723,000 7,142,000 7,560,000 7,977,000 6,789,000 7,627,000 8,045,000 8,464,000  9,156,000 13,028,000 12,444,000 11,412,000 
        total
      1,285,749,000 1,267,739,000 1,241,650,000 1,233,448,000 1,255,103,000 1,145,339,000 1,127,667,000 1,095,088,000 1,110,840,000 1,020,290,000 1,007,596,000 1,024,995,000 981,780,000 1,003,520,000 1,015,150,000 1,018,839,000 997,670,000 950,786,000 949,633,000 959,982,000 958,024,000 954,465,000 948,068,000 955,879,000 897,552,000 892,768,000 869,131,000 851,851,000 730,271,000 750,306,000 758,205,000 788,258,000 832,357,000 841,691,000 839,488,000 877,627,000 893,588,000 904,134,000 879,909,000 872,502,000 901,625,000 905,971,000 902,249,000 889,349,000 893,234,000 817,198,000 795,336,000 825,790,000 852,645,000 856,423,000 817,354,000 801,013,000 826,395,000 796,686,000 789,960,000 779,601,000 788,460,000 767,818,000 757,334,000 765,811,000 693,825,000 671,198,000 669,355,000 637,018,000 665,426,000 659,329,000 667,394,000 707,642,000 662,224,000 649,626,000 632,351,000     528,359,000 
        liabilities and equity
                                                                                  
        current liabilities:
                                                                                  
        accounts payable
      109,489,000 89,505,000 99,158,000 90,353,000 101,309,000 94,612,000 90,447,000 89,601,000 83,835,000 74,324,000 65,210,000 88,115,000 94,077,000 81,248,000 95,793,000 98,182,000 85,566,000 70,595,000 79,863,000 70,756,000 71,308,000 79,312,000 76,376,000 79,917,000 76,091,000 77,074,000 87,923,000 73,051,000 71,537,000 80,302,000 68,751,000 72,093,000 87,659,000 67,230,000 77,543,000 87,640,000 103,185,000 109,255,000 97,088,000 96,499,000 118,846,000 109,961,000 119,119,000 102,361,000 119,971,000 139,341,000 101,672,000 109,535,000 116,121,000 128,330,000 92,070,000 88,624,000 123,082,000 92,019,000 80,652,000 73,382,000 82,745,000 71,928,000 70,237,000 79,412,000 82,721,000 77,100,000 78,532,000 60,609,000 83,783,000 61,987,000 58,223,000 78,631,000 78,524,000 71,669,000 76,854,000  66,565,000 51,949,000 59,353,000 57,826,000 
        accrued expenses
      49,466,000 40,455,000 32,896,000 33,349,000 41,640,000 44,062,000 27,892,000 32,484,000 37,361,000 34,464,000 25,815,000 36,548,000 29,469,000 37,667,000 24,717,000 33,949,000 37,626,000 41,020,000 37,230,000 44,017,000 52,899,000 52,112,000 44,938,000 53,898,000 51,225,000 49,891,000 43,837,000 42,633,000 48,351,000 47,411,000 45,943,000 52,284,000 56,218,000 51,996,000 40,727,000 80,781,000 69,043,000 57,365,000 62,179,000 61,596,000 72,277,000 63,978,000 60,884,000 58,034,000 70,041,000 49,755,000 45,079,000 32,251,000 38,531,000 44,146,000 44,973,000 40,561,000 38,490,000 23,905,000 27,477,000 20,932,000 31,121,000 27,688,000 33,911,000 29,685,000 32,809,000 32,628,000 34,965,000 31,661,000 31,265,000 26,703,000 30,864,000 37,966,000 25,143,000 20,635,000 19,641,000  22,052,000 18,764,000 27,385,000 30,192,000 
        operating lease liabilities
      22,081,000 24,729,000 31,494,000 39,003,000 47,268,000 23,435,000 26,851,000 28,348,000 28,687,000 26,204,000 26,340,000 26,047,000 26,873,000 22,668,000 18,441,000 16,036,000 16,729,000 14,635,000 14,255,000 15,861,000 19,472,000 19,019,000 20,069,000 20,965,000 21,351,000 20,847,000 20,805,000 20,599,000                                                 
        billings in excess of contract revenues
      34,780,000 36,989,000 28,756,000 30,369,000 25,796,000 15,613,000 20,574,000 18,066,000 29,560,000 29,392,000 23,966,000 12,444,000 9,914,000 5,451,000 2,614,000 3,687,000 14,814,000 18,752,000 28,833,000 38,663,000 32,608,000 38,154,000 55,087,000 61,327,000 55,266,000 69,387,000 50,610,000 53,855,000 17,793,000 11,152,000 9,050,000 8,772,000 3,615,000 4,646,000 5,013,000 8,893,000 5,141,000 9,677,000 4,971,000 6,158,000 7,061,000 6,451,000 3,904,000 2,617,000 4,639,000 4,978,000 12,298,000 4,961,000 6,754,000 4,341,000 7,913,000 9,529,000 11,280,000 20,817,000 19,999,000 23,753,000 13,627,000 15,212,000 12,319,000 16,071,000 14,484,000 19,222,000 27,090,000 24,746,000 24,901,000 23,517,000 22,346,000 22,588,000 7,672,000 10,759,000 9,786,000  8,642,000 17,900,000 23,636,000 19,195,000 
        total current liabilities
      215,816,000 191,678,000 192,304,000 193,074,000 216,013,000 177,722,000 165,764,000 168,499,000 179,443,000 164,384,000 141,331,000 163,154,000 160,333,000 147,034,000 141,565,000 151,854,000 154,735,000 145,002,000 160,181,000 169,297,000 176,287,000 188,597,000 196,470,000 216,107,000 203,933,000 217,199,000 203,175,000 198,086,000 163,121,000 139,774,000 124,913,000 134,528,000 150,250,000 126,691,000 126,128,000 179,753,000 179,834,000 248,042,000 219,707,000 171,783,000 205,690,000 188,759,000 192,179,000 170,830,000 200,510,000 194,447,000 159,327,000 173,328,000 193,899,000 179,326,000 147,471,000 141,240,000 185,950,000 139,328,000 130,786,000 120,880,000 130,526,000 118,821,000 119,078,000 127,847,000 132,817,000 129,351,000 141,256,000 117,926,000 141,149,000 113,446,000 112,895,000 140,646,000 112,890,000 104,758,000 108,119,000  97,259,000 114,113,000 112,324,000 111,298,000 
        long-term debt
      378,169,000 415,321,000 419,619,000 413,918,000 448,216,000 412,531,000 411,475,000 382,207,000 412,070,000 321,933,000 321,795,000 321,658,000 321,521,000 321,383,000 321,246,000 321,108,000 320,971,000 320,834,000 320,696,000 323,958,000 323,735,000 323,512,000 323,289,000 323,066,000 322,843,000 322,619,000 322,396,000 322,173,000 321,950,000 321,727,000 321,503,000 321,280,000 333,141,000                                        189,500,000 198,500,000 193,112,000 190,600,000 
        operating lease liabilities—noncurrent
      55,622,000 44,705,000 40,979,000 45,195,000 50,432,000 44,406,000 49,169,000 54,835,000 61,444,000 48,131,000 54,365,000 60,813,000 65,010,000 64,316,000 59,655,000 47,839,000 45,986,000 37,777,000 38,877,000 42,058,000 45,879,000 47,280,000 51,390,000 60,641,000 51,131,000 50,969,000 53,830,000 55,991,000                                                 
        deferred income taxes
      104,055,000 98,738,000 92,365,000 88,923,000 78,985,000 73,501,000 72,338,000 69,657,000 62,232,000 57,893,000 58,974,000 57,847,000 59,115,000 67,188,000 72,908,000 73,888,000 68,497,000 62,229,000 59,458,000 58,492,000 56,466,000 53,299,000 48,926,000 44,633,000 35,740,000 36,526,000 33,706,000 30,626,000 22,846,000 25,605,000 21,896,000 21,870,000 25,561,000 54,491,000 55,875,000 57,831,000 68,449,000 73,753,000 70,979,000 71,624,000 74,006,000 89,255,000 89,368,000 92,137,000 92,007,000 90,040,000 104,590,000 107,931,000 108,511,000 106,481,000 105,057,000 103,436,000 106,767,000 104,349,000 102,920,000 103,942,000 104,352,000 99,451,000 92,239,000 91,957,000 92,466,000 83,076,000 79,419,000 80,607,000 81,642,000 84,680,000 81,339,000 83,351,000 84,493,000 82,854,000 81,337,000  82,779,000 83,389,000 82,737,000 84,825,000 
        total liabilities
      768,607,000 765,627,000 759,781,000 753,504,000 806,193,000 719,930,000 709,644,000 686,048,000 725,292,000 654,321,000 639,074,000 660,973,000 613,560,000 606,614,000 602,962,000 603,435,000 598,673,000 576,006,000 589,536,000 603,372,000 611,356,000 621,566,000 627,066,000 649,250,000 618,153,000 630,944,000 617,653,000 612,574,000 515,343,000 525,871,000 546,691,000 576,756,000 611,061,000 612,967,000 608,690,000 646,099,000 645,698,000 649,557,000 630,674,000 622,613,000 649,452,000 653,888,000 650,081,000 640,796,000 637,271,000 581,644,000 558,826,000 588,090,000 610,544,000 603,904,000 567,554,000 526,428,000 552,970,000 502,934,000 494,359,000 485,805,000 495,923,000 482,472,000 475,833,000 484,574,000 417,000,000 400,491,000 406,543,000 384,054,000 420,877,000 414,348,000 422,906,000 471,293,000 432,720,000 416,874,000 403,752,000  378,694,000 409,030,000 400,617,000 397,832,000 
        commitments and contingencies
                                                                                  
        equity:
                                                                                  
        common stock—.0001 par value...
      7,000 7,000 7,000 7,000 7,000 7,000 7,000 6,000 6,000 7,000 7,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000  6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000  6,000 6,000   6,000 6,000 6,000 6,000 6,000 6,000  5,000 5,000 4,000 4,000 
        treasury stock
      -11,594,000 -11,594,000 -11,594,000 -3,171,000                        -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,433,000 -1,107,000                                   
        additional paid-in capital
      329,071,000 325,501,000 323,613,000 322,810,000 322,383,000 320,971,000 319,776,000 318,517,000 317,337,000 315,767,000 314,321,000 312,533,000 312,091,000 310,640,000 308,790,000 307,597,000 308,482,000 307,065,000 304,977,000 303,999,000 304,757,000 305,070,000 304,531,000 302,558,000 302,189,000 301,874,000 299,320,000 296,774,000 295,135,000 292,902,000 291,468,000 290,298,000 289,821,000 289,357,000 288,167,000 287,491,000 286,303,000 286,266,000 285,506,000 284,589,000 283,247,000 282,141,000 280,792,000 279,954,000 278,166,000 277,097,000 275,382,000 275,610,000 275,183,000 274,279,000 272,688,000 272,156,000 271,418,000 270,434,000 269,613,000 268,998,000 267,918,000 267,297,000 266,961,000 266,809,000 266,329,000 265,783,000 264,854,000 263,879,000 263,579,000 263,279,000 262,876,000 262,625,000 262,647,000 262,558,000 260,669,000  260,670,000 200,490,000 169,936,000 168,830,000 
        accumulated retained earnings
      200,954,000 188,320,000 170,596,000 160,901,000 127,485,000    70,220,000    56,314,000    90,369,000    40,937,000                                                        
        accumulated other comprehensive loss
      -1,296,000 -122,000 -753,000 -603,000 -965,000 -3,338,000 -677,000 -727,000 -2,015,000  -622,000 -1,600,000              -992,000 -832,000 -1,069,000      -937,000 -2,619,000 -1,907,000 -1,145,000 -1,404,000 -1,426,000 -1,574,000 -1,983,000 -2,128,000 -1,489,000 -1,542,000 -734,000 -1,061,000 -476,000 -951,000 -473,000 -633,000 -495,000 -369,000                         
        total equity
      517,142,000 502,112,000 481,869,000 479,944,000 448,910,000 425,409,000 418,023,000 409,040,000 385,548,000 365,969,000 368,522,000 364,022,000 368,220,000 396,906,000 412,188,000 415,404,000 398,997,000 374,780,000 360,097,000 356,610,000 346,668,000 332,899,000 321,002,000 306,629,000 279,399,000 261,824,000 251,478,000 239,277,000 214,928,000 224,435,000 211,514,000 211,502,000 221,296,000 228,724,000 230,798,000 231,528,000 247,890,000 254,577,000 249,235,000 249,889,000 252,173,000 252,083,000 252,168,000 248,553,000 255,963,000 235,554,000 236,510,000 237,700,000 242,101,000 252,519,000 249,800,000 274,585,000 273,425,000 293,752,000 295,601,000 293,796,000 292,537,000 285,346,000 281,501,000 281,237,000 276,825,000 270,707,000 262,812,000 252,964,000 244,549,000 244,981,000 244,488,000 236,349,000         
        retained earnings
           107,769,000 98,917,000 91,244,000  48,662,000 54,816,000 53,083,000  87,483,000 97,393,000 101,426,000  65,662,000 51,856,000 49,751,000  30,335,000 19,856,000 10,896,000                         -31,770,000 -20,769,000 -22,217,000 3,024,000 2,591,000 23,650,000 27,043,000 23,858,000 24,042,000 18,468,000   12,261,000                
        prepaid expenses and other current assets
               41,915,000 29,982,000 33,435,000  36,336,000 44,628,000 43,368,000  33,121,000 39,330,000 43,563,000  34,220,000 29,602,000 32,300,000  31,626,000 31,734,000 34,392,000  39,411,000 40,947,000 40,933,000  47,984,000 54,199,000 79,838,000  78,341,000 76,107,000 71,985,000  76,871,000 67,730,000 79,643,000  58,440,000 57,310,000 39,461,000  56,867,000 50,203,000 40,479,000  50,999,000 42,932,000 41,553,000                 31,452,000 30,557,000 25,592,000  
        revolving credit facility
               55,000,000 55,000,000 50,000,000                 11,500,000 30,882,000 70,882,000 91,000,000 95,000,000 90,000,000 86,000,000 115,500,000 104,111,000 60,000,000 45,000,000 35,000,000 20,000,000 28,000,000 18,000,000 20,000,000  35,000,000 35,000,000 37,000,000 35,000,000 45,000,000 41,000,000 21,500,000             11,000,000 30,000,000 41,500,000 60,677,000 49,710,000 42,500,000 29,500,000      
        accumulated other comprehensive income
               1,533,000   -191,000 -1,223,000 5,999,000 6,375,000 140,000 2,047,000 3,258,000 2,854,000 968,000 -2,512,000 -3,391,000 -6,831,000 295,000    -3,809,000 231,000 446,000 630,000 3,000                    -380,000 -547,000 -1,289,000 481,000 3,000 -795,000 109,000 923,000 357,000 212,000 -36,000 421,000 539,000  58,000   2,767,000 668,000  379,000 242,000   
        assets held for sale— noncurrent
                          2,900,000 3,970,000 3,970,000 3,970,000 3,970,000    5,110,000    8,530,000    9,299,000                                        
        assets held for sale
                                 15,751,000 24,779,000                  1,704,000 32,773,000 45,104,000                            
        liabilities held for sale
                                 7,948,000 13,940,000                   26,581,000 32,493,000                            
        liabilities held for sale— noncurrent
                                  146,000                                                
        accumulated deficit
                              -23,091,000 -39,064,000 -47,016,000 -55,001,000 -74,971,000 -67,271,000 -78,973,000 -77,999,000 -67,101,000 -58,269,000 -53,323,000 -52,629,000 -35,841,000 -28,858,000 -33,418,000 -31,699,000 -27,664,000 -26,829,000 -27,141,000 -29,865,000 -21,475,000 -40,488,000 -38,402,000 -36,965,000               -206,000 -10,010,000 -18,336,000            
        goodwill and other intangible assets—net
                               76,576,000 76,576,000 76,576,000  84,038,000 84,186,000 84,334,000  84,631,000 84,779,000 84,927,000  85,314,000 85,544,000 85,774,000  86,900,000  93,522,000  80,885,000 81,031,000 81,047,000  81,684,000 81,975,000 103,967,000  98,666,000 98,729,000 98,793,000                     
        current portion of long-term debt
                                   909,000 1,169,000 1,379,000 2,758,000                                           4,085,000 
        investments in joint ventures
                                   5,164,000 3,489,000 1,963,000 2,714,000 7,344,000 4,794,000 5,756,000 4,734,000 5,791,000 5,293,000 3,131,000 3,761,000 12,319,000 5,859,000 7,726,000 7,889,000 8,445,000 5,619,000 7,055,000 8,256,000 7,518,000 6,072,000 6,457,000 7,047,000 7,076,000 6,899,000 6,908,000 6,923,000 7,221,000 6,615,000 6,738,000 7,329,000 7,171,000 7,090,000 7,221,000 7,943,000 7,926,000 7,764,000 8,143,000 9,339,000 9,528,000 9,473,000  10,285,000 10,145,000 10,008,000 9,996,000 
        assets held for sale—noncurrent
                                   8,846,000 6,916,000 8,463,000  8,569,000 8,991,000 9,118,000            9,274,000 8,856,000                            
        other intangible assets — net
                                      908,000    1,499,000    2,428,000    8,963,000    1,976,000    3,232,000     1,340,000 1,987,000 2,633,000  714,000 819,000 927,000  1,230,000 1,423,000 1,616,000 1,063,000 1,240,000 940,000      
        current portion of long term debt
                                       2,819,000 2,845,000 2,439,000 2,465,000 11,745,000 10,469,000 7,530,000 7,506,000 8,369,000 8,272,000 7,818,000 5,859,000 373,000 278,000   2,509,000 2,515,000 2,526,000 13,098,000 2,587,000 2,658,000 2,813,000                     
        8% senior notes
                                       320,834,000 320,614,000                                          
        7 3/8% senior notes
                                         273,248,000 272,998,000 272,748,000 272,498,000 272,248,000 274,909,000 274,902,000  274,887,000 274,880,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000 250,000,000                 
        notes payable
                                       12,392,000 12,696,000 12,995,000 13,293,000 45,012,000 47,821,000 52,265,000 54,382,000 52,108,000 53,880,000 62,393,000 49,497,000                                
        accounts receivable — net
                                                106,592,000               110,044,000 108,152,000 113,743,000  106,252,000 134,967,000 126,352,000  124,133,000 131,523,000 159,238,000 98,963,000 101,765,000 92,590,000      
        property and equipment — net
                                                418,308,000               311,588,000 309,296,000 316,376,000  282,012,000 284,526,000 286,307,000  289,955,000 289,956,000 293,866,000 309,040,000 305,189,000 304,744,000      
        goodwill and other intangible assets — net
                                                89,014,000                                  
        inventories — noncurrent
                                                37,084,000               30,988,000 27,760,000 28,091,000  26,029,000 25,537,000 27,605,000  31,453,000 32,531,000 38,865,000 35,213,000 21,576,000 21,576,000      
        7 3⁄8% senior notes
                                                274,895,000                                  
        common stock — .0001 par value...
                                                6,000                     6,000             
        liabilities held for sale—noncurrent
                                                     707,000 1,212,000                            
        total great lakes dredge & dock corporation equity
                                                  255,963,000 235,554,000 236,510,000 237,700,000 242,946,000 252,883,000 249,982,000 274,817,000 273,635,000 293,543,000 295,373,000 293,343,000 291,969,000 284,976,000 281,188,000 281,386,000 278,953,000 272,477,000 264,618,000 254,296,000             
        noncontrolling interests
                                                      -845,000 -364,000 -182,000 -232,000 -210,000 209,000 228,000 453,000 568,000 370,000 313,000 -149,000 -2,128,000 -1,770,000 -1,806,000 -1,332,000 -1,239,000 64,000 604,000 631,000         
        long term note payable
                                                   485,000        2,500,000 2,500,000 2,500,000 2,500,000 5,000,000 5,000,000 5,000,000 5,000,000                
        contract revenues
                                                            166,532,000                      
        costs of contract revenues
                                                            142,643,000                      
        gross profit
                                                            23,889,000                      
        general and administrative expenses
                                                            11,456,000                      
        gain on sale of assets—net
                                                            -93,000                      
        operating income
                                                            12,526,000                      
        interest expense—net
                                                            -5,383,000                      
        equity in loss of joint ventures
                                                            -8,000                      
        loss on foreign currency transactions—net
                                                            -21,000                      
        loss on extinguishment of debt
                                                                                  
        income before income taxes
                                                            7,114,000                      
        income tax provision
                                                            -2,768,000                      
        net income
                                                            4,346,000                      
        net (income) loss attributable to noncontrolling interests
                                                            91,000                      
        net income attributable to great lakes dredge & dock corporation
                                                            4,437,000                      
        basic earnings per share attributable to great lakes dredge & dock corporation
                                                            70                      
        basic weighted-average shares
                                                            59,171,000                      
        diluted earnings per share attributable to great lakes dredge & dock corporation
                                                            70                      
        diluted weighted-average shares
                                                            59,534,000                      
        dividends declared per share
                                                            20                      
        other intangible assets—net
                                                              814,000    3,280,000    1,037,000           1,268,000 
        current portion of note payable
                                                              2,500,000 2,500,000 2,500,000 2,500,000 2,500,000                
        current portion of equipment debt
                                                              533,000 1,493,000 111,000 179,000 303,000 401,000 669,000 910,000 1,200,000 1,239,000 1,462,000 1,461,000 1,551,000 1,695,000 1,838,000      
        7 3/4% senior subordinated notes
                                                                   175,000,000  175,000,000  175,000,000 175,000,000 175,000,000 175,000,000 175,000,000 175,000,000      
        accumulated earnings
                                                                14,112,000 13,648,000  6,476,000               
        7.75% senior subordinated notes
                                                                  175,000,000    175,000,000            
        equity
                                                                                  
        common stock—0.0001 par value...
                                                                  6,000    6,000            
        7 3/4 % senior subordinated notes
                                                                    175,000,000              
        total great lakes dredge & dock corporation stockholders’ equity
                                                                      245,788,000 244,917,000 243,884,000 235,718,000         
        stockholders’ equity:
                                                                                  
        stockholders’ equity
                                                                                  
        liabilities and stockholders’ equity
                                                                                  
        minority interest
                                                                          468,000 468,000 2,239,000  2,002,000 2,024,000 2,014,000 2,005,000 
        total stockholders’ equity
                                                                          229,036,000 232,284,000 226,360,000  225,469,000 164,509,000  128,522,000 
        cash and equivalents
                                                                              29,710,000 1,135,000 286,000 3,640,000 
        accounts receivable
                                                                              101,750,000 86,151,000 107,010,000  
        property and equipment
                                                                              268,899,000 293,339,000 237,450,000  
        other intangible assets
                                                                              1,071,000 1,137,000 1,203,000  
        other assets
                                                                              9,869,000 10,134,000 9,587,000  
        total assets
                                                                              606,165,000 575,563,000 534,442,000  
        current maturities of long-term debt
                                                                               25,500,000 1,950,000  
        total liabilities and stockholders’ equity
                                                                              606,165,000 575,563,000   
        liabilities and stockholders' equity
                                                                                  
        stockholders' equity:
                                                                                  
        total stockholders' equity
                                                                                131,811,000  
        total liabilities and stockholders' equity
                                                                                534,442,000  
        inventories - non current
                                                                                 13,353,000 
        redeemable preferred stock
                                                                                  
        common stock—.01 par value...
                                                                                  
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-09-30 2008-06-30 2008-03-31 2007-09-30 2007-06-30 2007-03-31 
                                                                                  
          operating activities:
                                                                                  
          net income
        12,634,000 17,724,000 9,695,000 33,416,000 19,716,000 8,852,000 7,673,000 21,024,000   1,733,000 -3,231,000  -9,910,000 -4,033,000 11,057,000 24,707,000 13,806,000 2,105,000 8,814,000 10,609,000 12,547,000 8,960,000 33,987,000 15,973,000 7,952,000 8,246,000 17,168,000           -1,719,000 -4,035,000        -5,195,000   -25,188,000 411,000 -6,487,000 -2,152,000 4,346,000 953,000 7,026,000 5,659,000 2,168,000 2,398,000 6,432,000 7,721,000 10,334,000 9,233,000 -275,000 1,155,000 7,404,000 6,450,000 1,401,000 2,930,000 -1,180,000 644,000 1,679,000 964,000 
          adjustments to reconcile net income to net cash flows from operating activities:
                                                                                  
          depreciation and amortization
        11,380,000 10,867,000 10,644,000 10,531,000 10,482,000 10,089,000 11,108,000 11,020,000  10,533,000 10,937,000 10,850,000  11,047,000 11,614,000 11,316,000  10,993,000 10,628,000 10,053,000  8,877,000 9,256,000 9,451,000 10,373,000 8,771,000 9,096,000 8,905,000 9,099,000 12,309,000 13,340,000 15,641,000 22,334,000 12,557,000 11,058,000 14,571,000 17,331,000 16,872,000 14,892,000 13,928,000 16,838,000 14,722,000 19,872,000 13,153,000 -32,693,900 10,823,000 11,036,000 10,885,000 10,915,000 11,972,000 11,660,000 12,075,000 13,397,000 10,514,000 8,359,000 7,764,000 10,839,000 11,195,000 9,238,000 9,566,000 8,281,000 8,027,000 8,554,000 9,439,000 8,435,000 7,106,000 5,836,000 11,646,000 8,042,000 5,557,000 7,657,000 7,204,000 6,456,000 6,481,000 
          deferred income taxes
        5,714,000 6,160,000 3,492,000 9,816,000 4,682,000 2,062,000 2,665,000 6,989,000 5,537,000 -1,809,000 796,000 -791,000  -3,347,000 -853,000 3,285,000 6,912,000 3,181,000 829,000 1,389,000 1,991,000 4,076,000 3,131,000 11,310,000 752,000 3,203,000 4,105,000 7,074,000 4,829,000 3,781,000 70,000 -2,920,000  -2,476,000 -1,122,000 -2,306,000  2,809,000 -549,000 -2,108,000  628,000 2,386,000 -6,045,000  -4,742,000 -3,167,000 -3,125,000 1,438,000 544,000 299,000 -2,585,000 1,714,000 1,864,000 -585,000 107,000 5,539,000 7,783,000 989,000 21,000 8,088,000 2,275,000 -1,927,000 -1,031,000 -2,196,000 3,341,000 -1,872,000 2,128,000 1,401,000 1,397,000 1,382,000 541,000   
          gain on sale of assets
        122,000 -1,935,000 -460,000  -276,000 -805,000 -2,016,000  -35,000 -243,000 -18,000  -40,000    -291,000              -199,000        -10,000                                   
          amortization of capitalized contract costs
        5,494,000 2,762,000 5,840,000 3,396,000 9,054,000 4,447,000                                                                     
          amortization of deferred financing fees
        373,000 926,000 902,000 859,000 858,000 849,000 633,000 241,000 241,000 241,000 242,000 241,000 399,000 266,000 317,000 317,000 317,000 317,000 1,312,000 403,000 403,000 403,000 402,000 403,000 402,000 403,000 1,073,000 868,000 867,000 868,000 868,000 901,000 812,000 822,000 821,000 825,000 1,043,000 630,000 626,000 623,000 640,000 914,000 720,000 492,000  460,000 288,000 288,000 288,000 289,000 288,000 288,000 288,000 288,000 335,000 334,000 334,000 406,000 386,000 389,000 402,000 402,000 401,000 402,000 402,000 401,000 402,000 472,000 488,000 488,000 488,000    
          loss on extinguishment of debt
                                                                                  
          share-based compensation expense
        3,429,000 2,733,000 3,360,000 1,948,000 2,484,000 3,533,000 1,807,000 756,000 2,107,000 1,774,000 2,198,000 237,000 1,451,000 1,285,000 1,000,000 552,000 1,416,000 1,208,000 798,000 1,766,000 1,863,000 1,761,000 1,455,000 1,675,000 1,674,000 1,615,000 1,619,000 2,000,000 1,349,000 1,030,000 1,255,000 1,009,000 449,000 756,000 840,000 918,000 179,000 270,000 1,079,000 927,000 1,143,000 839,000 1,001,000 1,057,000  829,000 -9,000 996,000 799,000 1,000,000 701,000 751,000 692,000 675,000 699,000 1,015,000 614,000 381,000 323,000 520,000 360,000 873,000 561,000 300,000 300,000 403,000 251,000 124,000       
          changes in assets and liabilities:
                                                                                  
          accounts receivable
        39,152,000 1,766,000 2,215,000 4,728,000 -75,524,000 13,773,000 -15,797,000 14,328,000 -25,575,000 12,694,000 -10,384,000 13,344,000 23,780,000 656,000 -32,163,000 45,791,000  -7,946,000 29,991,000 -26,742,000  -13,270,000 10,120,000 -24,229,000 11,258,000 19,724,000 -16,273,000 30,285,000  -4,360,000 19,611,000 -21,908,000 3,750,000 -17,332,000 29,360,000 -3,234,000 27,111,000 -5,390,000 -10,195,000 29,748,000  -37,463,000 -32,102,000 37,746,000  -24,843,000 -9,338,000 30,390,000 26,098,000 6,607,000 -4,853,000 8,408,000 -337,000 -20,561,000 6,143,000 -1,842,000 -12,380,000 -254,000 5,340,000 -18,365,000 8,954,000 28,715,000 -8,615,000 27,549,000     2,802,000 -9,175,000 23,119,000    
          contract revenues in excess of billings
        -30,770,000 8,842,000 19,782,000 -4,767,000 17,602,000 -21,290,000 -1,748,000 -26,000 -19,445,000 -6,085,000 38,096,000 -15,379,000  977,000 11,920,000 -34,691,000  1,212,000 -5,638,000 3,188,000  -152,000 16,643,000 -14,520,000  5,777,000 -14,745,000 1,538,000 5,318,000 16,740,000 120,000 32,703,000 -8,155,000 8,197,000 -15,150,000 19,362,000  -892,000 -144,000 6,748,000 -14,280,000 48,953,000 -14,465,000 -20,160,000  3,095,000 4,070,000 -25,457,000 -3,079,000 -11,744,000 2,032,000 -4,351,000 -6,728,000 -11,257,000 -16,469,000 -5,819,000 -2,866,000 1,385,000 -6,223,000 3,945,000 -6,832,000 -4,525,000 5,294,000 9,573,000        -1,785,000 248,000 3,738,000 
          inventories
        1,769,000 -593,000 -3,401,000 1,789,000 -6,158,000 -120,000 2,926,000 -1,546,000 -648,000 -4,974,000 -1,612,000 -3,766,000  -5,114,000 -2,825,000 -5,703,000  76,000 2,146,000 -3,379,000  1,653,000 -2,518,000 -2,215,000  122,000 -1,580,000 280,000  -1,285,000 418,000 665,000  -1,907,000 -927,000 -609,000  -2,520,000 -1,708,000 -2,603,000  -3,470,000 -1,863,000 1,572,000  1,692,000 -770,000 -418,000 -1,129,000 -3,793,000 -3,288,000 3,066,000 7,747,000 -1,963,000 -6,784,000 -1,869,000 -143,000 -4,162,000 -366,000 4,000 1,784,000 -977,000 1,365,000 458,000 4,149,000 1,659,000 3,660,000 368,000       
          prepaid expenses and other current assets
        1,518,000 -11,323,000 379,000 -384,000 -6,221,000 -522,000 657,000 -1,424,000 -6,637,000 -9,774,000 3,180,000 2,981,000  14,000 -1,440,000 -6,612,000 2,154,000 4,588,000 4,963,000 -832,000 -4,649,000 -4,618,000 2,697,000 8,036,000  -416,000 2,548,000 -1,678,000 -605,000 1,220,000 -187,000 11,548,000  3,102,000 6,699,000 -7,392,000  -2,677,000 -744,000 -3,418,000  -8,145,000 2,532,000 -1,114,000  -7,960,000 -7,467,000 12,684,000 1,399,000 -5,620,000 -7,246,000 1,343,000 8,092,000 -10,154,000 1,526,000 -7,399,000 -699,000 791,000 -7,897,000 -4,535,000 -3,110,000 170,000 -187,000 2,280,000 1,562,000 -1,228,000 1,135,000 2,060,000      3,851,000 
          accounts payable and accrued expenses
        22,652,000 -89,000 1,728,000 -10,119,000 -3,566,000 13,836,000 -4,311,000 2,730,000 12,381,000 15,263,000 -30,268,000 4,000,000  -5,513,000 -8,341,000 12,247,000  -9,567,000 7,635,000 -10,303,000  12,936,000 -7,706,000 -523,000 -838,000 3,340,000 10,979,000 -935,000  19,191,000 -11,271,000 -19,077,000  7,443,000 -6,888,000 -27,610,000  -2,861,000 9,866,000 -33,322,000 10,202,000 -11,022,000 25,589,000 -24,463,000  23,538,000 1,459,000 -14,070,000 23,294,000 30,397,000 -374,000 -30,695,000 26,366,000 10,038,000 9,492,000 -21,263,000 13,595,000 -4,184,000 -1,363,000 -4,160,000 -1,606,000 -4,024,000 20,301,000 -19,724,000    9,814,000      5,150,000 
          billings in excess of contract revenues
        -2,209,000 8,233,000 -1,613,000 4,573,000 10,183,000 -4,961,000 2,509,000 -11,495,000 169,000 5,426,000 11,522,000 2,530,000  2,837,000 -1,074,000 -11,126,000  -10,081,000 -9,830,000 6,055,000  -16,933,000 -6,241,000 6,062,000 -14,121,000 18,777,000 -3,245,000 36,062,000 7,670,000 2,103,000 278,000 -2,527,000  -367,000 -3,880,000 3,931,000  4,701,000 -1,198,000 -910,000 668,000 2,407,000 1,495,000 -2,245,000  -7,042,000 7,059,000 -1,793,000 4,039,000 -3,572,000 -1,616,000 -1,751,000 -9,587,000 818,000 -3,755,000 10,126,000 -1,585,000 2,893,000 -3,752,000 1,587,000 -5,399,000 -7,868,000 2,344,000 -155,000 1,384,000 1,171,000 -242,000 2,806,000 -3,087,000 973,000 4,349,000   4,441,000 
          other noncurrent assets and liabilities
        -2,332,000 3,086,000 3,894,000 5,528,000 2,689,000 -3,500,000 2,657,000 -2,140,000 -1,856,000 -1,620,000 -1,420,000 -1,678,000 2,143,000 -655,000 404,000 205,000  -289,000 40,000 242,000 -251,000 1,256,000 1,229,000 779,000 1,564,000 152,000 838,000 566,000  596,000 -237,000 -4,506,000  -1,861,000 1,634,000 -255,000  -696,000 10,000 -780,000  171,000 -735,000 -1,475,000  -1,263,000 -24,000 -1,082,000 1,399,000 -1,142,000 63,000 -810,000 2,513,000 -1,658,000 -343,000 -176,000 593,000 2,386,000 -1,304,000 -2,390,000 -1,889,000 2,121,000 -38,000 -1,664,000   874,000 33,000 209,000 766,000 84,000 -100,000   
          cash from operating activities
        79,748,000 49,159,000 56,917,000 60,854,000 -13,519,000 26,772,000 18,368,000 38,441,000 -2,152,000 15,480,000 24,777,000 9,320,000   -25,471,000 26,317,000 6,199,000 7,207,000 44,841,000 -9,240,000 2,951,000 8,536,000 37,389,000 30,071,000 19,269,000 67,309,000 -2,489,000 108,460,000 48,719,000 63,658,000 20,646,000 4,630,000 19,441,000 2,233,000 4,904,000 -5,060,000 25,692,000 5,718,000 4,300,000 2,960,000 33,019,000 2,984,000 3,696,000 -10,577,000  -759,000 5,016,000 6,010,000                           
          investing activities:
                                                                                  
          purchases of property and equipment
        -29,466,000 -35,913,000 -60,589,000 -21,250,000 -22,613,000 -38,269,000 -52,351,000 -11,912,000 -52,647,000 -43,416,000 -21,148,000 -33,629,000  -30,867,000 -42,835,000 -28,866,000  -16,973,000 -37,790,000 -27,038,000  -9,048,000 -12,343,000 -8,733,000  -13,292,000 -16,612,000 -7,704,000  -17,881,000 -4,241,000 -7,549,000  -15,111,000 -16,814,000 -17,452,000  -26,692,000 -17,233,000 -14,917,000  -16,564,000 -16,053,000 -20,777,000  -17,908,000 -26,894,000 -21,631,000 -28,399,000 -10,301,000 -12,440,000 -15,514,000 -32,470,000 -7,587,000 -14,327,000 -8,101,000 -8,532,000 -11,318,000 -9,163,000 -4,420,000 -6,975,000 -5,310,000 -5,743,000 -7,230,000           
          proceeds from dispositions of property and equipment
        77,000 2,000,000 532,000 121,000 296,000 5,392,000 3,641,000 29,484,000 35,000 1,125,000 55,000 40,000 950,000 1,110,000 279,000 3,957,000   3,514,000 489,000 447,000 35,000 41,000 5,369,000 147,000 1,635,000 2,266,000 4,964,000 5,015,000 879,000 6,986,000 1,947,000 265,000 7,802,000 137,000 10,293,000 25,000 155,000 1,052,000 75,000 40,000  1,273,000 277,000 64,000 2,621,000 4,109,000 165,000 58,000 479,000 337,000 158,000 68,000 9,265,000 177,000 7,017,000 258,000               
          cash from investing activities
        -29,389,000 -33,913,000 -60,589,000 -20,718,000 -22,492,000 -37,973,000 -46,959,000 -8,271,000 -23,163,000 -43,381,000 -20,023,000 -33,574,000  -30,827,000 -41,885,000 -27,756,000  -13,016,000 -37,567,000 -27,038,000  -9,048,000 -11,854,000 -8,286,000  -12,393,000 6,015,000 -7,617,000  -15,615,000 723,000 -2,534,000  -8,125,000 -14,867,000 -10,152,000  -26,555,000 -6,940,000 -14,892,000  -15,512,000 -15,978,000 -20,737,000  -16,635,000 -23,364,000 -24,693,000                           
          financing activities:
                                                                                  
          deferred financing fees
        -1,558,000 -9,000   -667,000 364,000                          -3,000 -4,461,000 -58,000       -29,000           -133,000 -5,829,000               
          payment for extinguishment of debt
                                                                                  
          taxes paid on settlement of vested share awards
        -126,000 -193,000 -887,000 -362,000 -289,000 -681,000 -416,000 -61,000 -207,000 -335,000  -1,827,000  -1,000 -3,784,000  -68,000 -178,000 -1,928,000  -235,000 -741,000 -2,188,000  -15,000 -124,000 -936,000  -164,000 -164,000      -252,000 -13,000  -17,000   -3,000 -28,000 -249,000 -28,000 -19,000 -210,000 -2,000                  
          exercise of options and purchases from employee stock plans
        616,000 564,000 -1,000 615,000 151,000 862,000  -11,000 562,000  565,000 193,000 390,000  881,000 180,000 1,260,000  638,000 696,000 622,000  599,000 2,130,000 1,626,000  419,000 39,000 404,000  433,000 434,000  490,000 415,000   110,000 736,000  922,000 205,000 415,000                           
          borrowings under revolving loans
        106,000,000 85,000,000 25,000,000 55,000,000                         11,000,000 1,000,000 17,000,000 35,500,000 37,379,000 23,934,000 28,112,000 155,611,000 41,500,000 53,500,000 38,000,000   26,000,000 53,000,000  35,500,000 29,500,000 40,000,000 32,500,000 50,500,000 64,500,000 79,500,000         14,968,000           
          borrowings under second lien credit agreement
                                                                                  
          repayments of second lien term loan
                                                                                  
          repayments of revolving loans
        -51,000,000 -90,000,000 -20,000,000 -90,000,000 -20,000,000 -15,000,000 -76,000,000 -30,000,000 -53,000,000 -40,000,000 -25,000,000              -11,500,000  -40,000,000 -21,118,000 -21,000,000  -33,379,000 -53,434,000 -16,723,000  -26,500,000 -43,500,000 -23,000,000   -28,000,000 -33,000,000  -35,500,000 -31,500,000 -38,000,000 -42,500,000 -46,500,000 -45,000,000 -58,000,000         -25,968,000           
          repurchases of common stock
        -8,423,000 -3,171,000                                                                       
          payments on finance lease obligations
        -490,000 -491,000 -522,000 -522,000 -142,000 -513,000 -598,000 -390,000                                                                   
          cash from financing activities
        -49,669,000 -5,500,000 -4,739,000 -39,016,000 34,190,000 104,000 28,003,000 -30,209,000 34,983,000 -72,000 4,793,000 50,227,000  -263,000 193,000 -1,437,000  880,000 -4,215,000 -2,524,000  -3,290,000 518,000 -1,306,000  364,000 -937,000 -12,315,000  -39,954,000 -20,567,000 -5,238,000 3,792,000 3,790,000 15,645,000 10,942,000          -39,000 -2,260,000 2,214,000                           
          net increase in cash, cash equivalents and restricted cash
        690,000   1,120,000 -1,821,000 -11,097,000 -588,000 -39,000 9,668,000 -27,973,000 9,547,000 25,973,000    -2,876,000  -4,929,000 3,059,000 -38,802,000 -13,215,000 -3,802,000 26,053,000 20,479,000 6,140,000 55,280,000 2,589,000 88,528,000 11,331,000                                              
          cash, cash equivalents and restricted cash at beginning of period
        10,216,000 23,761,000 6,546,000 147,459,000 216,510,000 186,995,000 34,458,000 17,352,000                                           
          cash, cash equivalents and restricted cash at end of period
        690,000 9,746,000 -8,411,000 11,336,000 -1,821,000 -11,097,000 -588,000 23,722,000 9,668,000 -27,973,000 9,547,000 32,519,000 -32,287,000 -38,587,000 -67,163,000 144,583,000 -28,379,000 -4,929,000 3,059,000 177,708,000 -13,215,000 -3,802,000 26,053,000 207,474,000 6,140,000 55,280,000 2,589,000 122,986,000 11,331,000 8,089,000 802,000 14,236,000                                           
          reconciliation of cash, cash equivalents and restricted cash
                                                                                  
          cash and cash equivalents
           11,336,000    22,802,000   9,547,000 32,519,000 -32,287,000 -36,587,000 -67,163,000 142,583,000 -28,379,000          2,589,000 122,986,000                                               
          restricted cash included in other long-term assets
               920,000       2,000,000                                                          
          supplemental cash flow information
                                                                                  
          cash paid for interest
        10,711,000 3,485,000 12,485,000 3,644,000 12,277,000 3,649,000 11,738,000 2,065,000 9,996,000 785,000 9,421,000 536,000 8,788,000 146,000 8,708,000 100,000 8,906,000 29,000 13,878,000 106,000 13,771,000 111,000 12,825,000 -277,000 12,546,000 -567,000 12,734,000 229,000 13,453,000 1,157,000 14,373,000 1,872,000 13,803,000 1,151,000 8,362,000 11,473,000 2,717,000 11,031,000 1,539,000 11,276,000   1,228,000 11,068,000  9,415,000 35,000 9,486,000 558,000 9,757,000 -113,000 9,881,000 411,000 9,449,000 20,000 9,582,000 -229,000 9,986,000 -244,000 2,972,000 6,421,000 101,000 6,482,000 265,000 6,588,000 -860,000 8,432,000 604,000 468,000 7,359,000 501,000 308,000 7,786,000 797,000 
          non-cash investing and financing activities
                                                                                  
          property and equipment purchased but not yet paid
        4,463,000 -1,931,000 4,018,000 3,338,000 9,891,000 108,000 -1,076,000 4,288,000 809,000 3,226,000 -1,790,000 3,755,000 -2,437,000 -2,798,000 3,602,000 10,319,000 -39,000 -4,090,000 5,284,000 5,855,000 3,735,000 -1,650,000 -193,000 4,801,000 2,018,000 -3,305,000 1,521,000 6,239,000 3,383,000 -1,300,000 1,606,000 3,614,000 2,234,000 -2,557,000 2,391,000 2,187,000 -5,716,000 10,222,000 -5,714,000 10,003,000   -4,611,000 7,301,000  9,204,000 -1,038,000 10,235,000 -8,880,000 4,712,000 1,467,000 6,253,000 54,000 1,462,000 1,274,000 4,957,000 1,856,000 -937,000 -2,463,000 6,766,000 5,994,000 1,121,000 924,000 520,000 407,000 1,406,000 -385,000 2,759,000       
          cash paid for income taxes
         115,000 2,163,000 76,000 998,000 20,000 1,295,000 176,000 -149,000 23,000 303,000 -45,000 -1,000 26,000 1,181,000 58,000 278,000 27,000 274,000 58,000 7,000 210,000   22,000 176,000   35,000 12,000 189,000 54,000                         -12,000 127,000 4,071,000 1,084,000  7,090,000 6,228,000 2,203,000  4,426,000 3,036,000 1,147,000 168,000 253,000 4,303,000    
          net decrease in cash, cash equivalents and restricted cash
                     -38,587,000                 802,000 -3,116,000                                           
          loss on sale of assets
                       -321,000    106,000  -39,000 -145,000  -27,000 81,000 279,000  1,452,000    175,000 169,000 11,000       5,000 -8,000  390,000 16,000 152,000                           
          borrowing under revolving loans
             15,000,000    40,000,000 5,000,000 75,000,000                                                               
          borrowing under second lien credit agreement
                                                                                 
          depreciation expense
                                                                                  
          repayments of debt
                                     -358,000 -364,000 -706,000                                           
          proceeds from issuance of debt
                                                                                 
          exercise of stock options and purchases from employee stock plans
                                                                                  
          net loss
                                      -974,000 -9,321,000  -4,945,000 -694,000 -16,788,000       2,724,000 -8,390,000  -2,086,000                             
          adjustments to reconcile net loss to net cash flows from operating activities:
                                                                                  
          repurchase of common stock
                                                                                  
          cash from (used in) operating activities
                                                                                  
          loss from discontinued operations, net of income taxes
                                 -859,000 -3,251,000 -3,380,000      368,000 -13,065,000          -1,059,000 -5,320,000 -2,739,000                           
          income from continuing operations
                            10,609,000 12,547,000 8,960,000 33,987,000 14,812,000 8,811,000 11,497,000 20,548,000 9,609,000             312,000    -1,027,000 3,883,000 -2,456,000                           
          loss on dispositions of property and equipment
                                                          58,000 2,000                       
          net cash flows from operating activities of continuing operations
                                        19,441,000 2,233,000       33,019,000 2,984,000 3,696,000 -10,577,000  300,000 6,346,000 8,645,000                           
          net cash flows from operating activities of discontinued operations
                                 -2,943,000 -8,482,000 2,668,000                 -1,059,000 -1,330,000 -2,635,000                           
          net cash flows from investing activities of continuing operations
                             -9,048,000 -11,854,000 -8,286,000  -13,251,000 -11,243,000 -7,557,000               -15,978,000 -20,737,000  -16,635,000 -28,665,000 -24,667,000                           
          net cash flows from investing activities of discontinued operations
                                858,000 17,258,000 -60,000                  5,301,000 -26,000                           
          net cash flows from financing activities of continuing operations
                             -3,290,000 518,000 -1,306,000  364,000 -999,000 -12,062,000                  -39,000 -2,260,000 2,214,000                           
          net cash flows from financing activities of discontinued operations
                                 62,000 -253,000                                               
          other non-cash restructuring items
                                    322,000 2,015,000                                           
          unrealized foreign currency gain
                                     -14,000 -57,000 -144,000  51,000 -39,000 -76,000  31,000 -167,000 -77,000  -287,000 -53,000 -736,000            -133,000                   
          effect of foreign currency exchange rates on cash and cash equivalents
                                    26,000 123,000 -72,000 66,000 -2,000 53,000 -84,000 1,000 109,000   62,000 -102,000  454,000 -20,000 -174,000 211,000 -316,000 -6,000 -24,000 -3,000 -1,000 -21,000 32,000                   
          repayments of debt with proceeds from sale-leaseback transactions
                                    13,034,000                                           
          net cash flows from operating activities from continuing operations
                             8,536,000 37,389,000 30,071,000  70,252,000 5,993,000 105,792,000  63,658,000                                             
          cash paid (refunded) for income taxes
                               137,000          19,000 466,000 89,000 426,000 105,000 -330,000 -1,000   619,000 368,000  1,669,000 1,416,000 -12,449,000 1,362,000 190,000 241,000 -19,000 1,531,000 -3,445,000 -2,926,000                   
          equity in loss of joint ventures
                                                 -8,341,000 3,841,000 1,098,000   1,435,000 1,843,000   385,000 590,000   8,000 16,000 298,000 -606,000 123,000 591,000 -158,000 -81,000 131,000 722,000           
          loss on extinguishment of 7 3/8% senior subordinated notes
                                                                                  
          cash distributions from joint ventures
                                       4,000,000 2,440,000 2,046,000 1,895,000 2,001,000   5,884,000                                  
          unrealized net loss from mark-to-market valuations of derivatives
                                        658,000 -459,000 1,548,000                                       
          7 3/8% senior notes tender premium
                                                                                 
          cash (refunded) paid for income taxes
                                   -10,000                                               
          unrealized foreign currency loss
                                                     -505,000 132,000 -188,000 -278,000 31,000 27,000 41,000 1,000 -171,000   -12,000                  
          excess income tax benefit from share-based compensation
                                                44,000 21,000 -8,000  19,000 -60,000 -4,000 -21,000 -40,000 -78,000 -15,000 -50,000 -257,000 91,000 27,000 7,000 -4,000                 
          net cash flows (used) provided in operating activities of discontinued operations
                                                                                  
          net cash flows (used) provided by investing activities of discontinued operations
                                                                                  
          net cash flows (used) provided in financing activities of continuing operations
                                                                                  
          cash (used) provided in financing activities
                                                                                  
          equity in earnings of joint ventures
                                     -1,675,000 -2,063,000 750,000  -2,639,000 -20,000 -3,067,000                                556,000       
          loss on extinguishment of 7 3/8% senior notes
                                                                                 
          loss from continuing operations
                                      -974,000 -9,321,000   -1,062,000 -3,723,000        -8,390,000                               
          equity in (earnings) loss of joint ventures
                                              -3,396,000 -419,000             29,000             -163,000         
          impairment of goodwill
                                                                               
          gain on adjustment of contingent consideration
                                                                                 
          changes in restricted cash
                                        7,035,000                                       
          purchase of treasury stock
                                                                                  
          net increase in cash and cash equivalents
                                          5,748,000 -4,272,000   5,342,000 1,710,000         34,016,000    -13,884,000 -32,467,000 -14,827,000 -27,670,000                   
          cash and cash equivalents at beginning of period
                                        11,167,000 14,184,000   42,389,000  75,338,000 24,440,000 113,288,000  48,478,000  3,250,000           
          cash and cash equivalents at end of period
                                        5,383,000 -2,174,000 5,748,000 6,895,000 -2,428,000 -7,641,000 5,342,000 15,894,000   -15,923,000 30,619,000  -16,979,000 -20,628,000 58,695,000 34,016,000 19,699,000 14,980,000 6,643,000 -13,884,000 -32,467,000 -14,827,000 85,618,000  11,053,000 -8,532,000 104,529,000  26,229,000 31,877,000 20,925,000           
          property and equipment purchased on capital leases and equipment notes
                                                     307,000           42,000                  
          property & equipment purchased on notes payable
                                                                                  
          proceeds from issuance of 8% senior notes
                                                                                 
          redemption of 7 3/8% senior notes
                                                                                 
          repayments of long term note payable
                                         -288,000 -284,000 -283,000  -272,000 -266,000 -265,000          -10,547,000                       
          repayments of term loan facility
                                             -1,250,000 -1,250,000 -1,250,000   -1,250,000 -1,250,000                               
          proceeds from equipment debt
                                                 2,000 408,000                               
          repayments of equipment debt
                                         -352,000 -443,000 -376,000  -356,000 -341,000 -367,000   -292,000 -214,000  -80,000    -6,000 -11,000 -25,000 -41,000 -76,000 -188,000 -238,000 -1,637,000 -57,000                 
          net decrease in cash and cash equivalents
                                                  -15,923,000 -11,770,000   -20,628,000 -16,643,000   14,980,000 -17,797,000                       
          income from discontinued operations, net of income taxes
                                                                                  
          adjustments to reconcile net income to net cash flows used in operating activities:
                                                                                  
          (gain) loss on dispositions of property and equipment
                                                                                  
          gain on bargain purchase acquisition
                                                                                 
          unrealized foreign currency (gain) loss
                                                                                  
          unrealized net (gain) income from mark-to-market valuations of derivatives
                                                                                  
          net cash flows used in operating activities of discontinued operations
                                                                                  
          payments on vendor performance obligations
                                                                                  
          payments for acquisitions of businesses, net of cash acquired
                                                                                  
          net cash flows used in investing activities of continuing operations
                                                                                  
          proceeds from term loan facility
                                                                                  
          proceeds from issuance of 7 3/8% senior notes
                                                                250,000,000               
          repayment of long term note payable
                                                                                  
          purchase of noncontrolling interest
                                                     -205,000                           
          purchase price of magnus assets comprised of promissory notes and other liabilities
                                                                                  
          unrealized net gain from mark-to-market valuations of derivatives
                                             320,000 -4,273,000 -1,332,000  1,150,000 -1,578,000 -1,051,000                               
          treasury stock
                                                                                  
          net cash from financing activities
                                             13,280,000 7,981,000 13,533,000   -3,703,000 19,646,000                               
          property and equipment purchased on notes payable
                                                  15,569,000                               
          (gain) loss on sale of assets
                                                                                  
          unrealized net income from mark-to-market valuations of derivatives
                                                                                  
          proceeds from
                                                                                  
          distributions paid to minority interests
                                                                              
          payments for acquisitions of businesses
                                                                                 
          other data:
                                                                                  
          adjusted ebitda from continuing operations
                                                                                  
          net cash flows from operating activities
                                                         21,622,000 -5,656,000 -13,232,000    -18,244,000 10,937,000 24,071,000 -4,894,000 -5,551,000 15,217,000 32,669,000 38,446,000 37,199,000 19,887,000 21,780,000   10,761,000 -9,355,000 9,588,000  481,000 965,000 
          net cash flows from investing activities
                                                         -6,192,000 1,325,000 -15,456,000    -8,033,000 733,000 -11,141,000 -2,146,000 -4,162,000   -5,691,000 -7,072,000           
          net cash flows from financing activities
                                                         4,585,000 19,317,000 10,915,000 -17,240,000 -1,191,000 -3,696,000 -1,425,000 -5,384,000 -1,481,000 -1,492,000 65,764,000    -12,452,000    17,713,000 5,667,000 11,475,000 6,473,000 24,951,000 57,092,000 1,046,000 
          maintenance expense
                                                                                  
          capital expenditures
        -29,466,000 -35,913,000 -60,589,000 -21,250,000 -22,613,000 -38,269,000 -52,351,000 -11,912,000 -52,647,000 -43,416,000 -21,148,000 -33,629,000   -42,835,000 -28,866,000 -16,973,000 -37,790,000 -27,038,000 -9,048,000 -12,343,000 -8,733,000 -13,292,000 -16,612,000 -7,704,000 -17,881,000 -4,241,000 -7,549,000 -15,111,000 -16,814,000 -17,452,000 -26,692,000 -17,233,000 -14,917,000 -16,564,000 -16,053,000 -20,777,000  -17,908,000 -26,894,000 -21,631,000                           
          free cash flows
        50,282,000 13,246,000 -3,672,000 39,604,000 -36,132,000 -11,497,000 -33,983,000 26,529,000 -54,799,000 -27,936,000 3,629,000 -24,309,000   -68,306,000 -2,549,000 6,199,000 -9,766,000 7,051,000 -36,278,000 2,951,000 -512,000 25,046,000 21,338,000 19,269,000 54,017,000 -19,101,000 100,756,000 48,719,000 45,777,000 16,405,000 -2,919,000 19,441,000 -12,878,000 -11,910,000 -22,512,000 25,692,000 -20,974,000 -12,933,000 -11,957,000 33,019,000 -13,580,000 -12,357,000 -31,354,000  -18,667,000 -21,878,000 -15,621,000                           
          proceeds from (payments on) vendor performance obligations
                                                     -3,100,000                           
          loss on extinguishment of 7 3/4% senior subordinated notes
                                                                5,145,000               
          gain on dispositions of property and equipment
                                                        -2,687,000    -300,000 -108,000 -93,000 -31,000 -8,809,000 -131,000 -2,504,000 -267,000 -90,000 -160,000 -72,000 -183,000           
          gain on adjustment of contingent earnout
                                                                                
          net cash flows from by operating activities of discontinued operations
                                                                                  
          acquisition of terra assets
                                                                                  
          proceeds from vendor performance obligations
                                                                                
          redemption of 7 3/4% senior subordinated notes
                                                                -175,000,000               
          senior subordinated notes redemption premium
                                                                -2,264,000               
          dividends paid
                                                            -14,834,000 -1,244,000 -1,242,000 -1,240,000 -1,238,000 -1,237,000 -1,231,000 -1,005,000 -1,005,000 -1,003,000 -1,004,000 -1,000,000           
          dividend equivalents paid on restricted stock units
                                                            -157,000 -17,000 -10,000 -12,000 -16,000 -9,000                 
          cash from financing activities of continuing operations
                                                                                  
          cash from financing activities of discontinued operations
                                                                                  
          acquisition of noncontrolling interest in nasdi, llc
                                                                40,000               
          purchase price of terra assets comprised of promissory notes and other liabilities
                                                                                  
          exercise of stock options
                                                            261,000 125,000 35,000 40,000   186,000 56,000             
          net cash flows from by operating activities
                                                            37,350,000                      
          acquisition of matteson assets
                                                                                  
          net cash flows used in investing activities
                                                            -33,991,000 -7,250,000                     
          purchase price of matteson assets comprised of promissory notes and other liabilities
                                                                                  
          excess income tax benefit from share based compensation
                                                              -91,000 -27,000 -7,000 4,000                 
          net cash flows used in operating activities
                                                                                  
          distribution from equity joint ventures
                                                                        371,000 250,000 250,000 250,000 650,000 500,000 250,000 
          acquisition of controlling interest in yankee environmental services
                                                                                  
          cash and cash equivalents at beginning of year
                                                                                  
          cash and cash equivalents at end of year
                                                                                  
          non-cash investing activity
                                                                                  
          change in cash and equivalents due to changes in foreign currency exchange rates
                                                                                  
          net change in cash and cash equivalents
                                                                 11,053,000 -8,532,000 56,051,000 -30,553,000 26,229,000 31,877,000 17,675,000           
          taxes paid on vested share awards
                                                                                  
          property and equipment purchased on equipment notes
                                                                    76,000 1,000 32,000 372,000 143,000         
          repayments of long-term debt
                                                                   -135,000 -168,000 -324,000 -243,000 -451,000           
          repayment of capital lease debt
                                                                   -3,000 -9,000 -10,000 -45,000 -1,000           
          non-cash financing activity
                                                                                  
          dispositions of property and equipment
                                                                    70,000 151,000 52,000 158,000 255,000 -209,000 383,000 599,000 458,000 171,000 170,000 25,555,000 2,774,000 49,000 
          purchase of matteson
                                                                                  
          purchase of noncontrolling interest in nasdi, llc
                                                                                  
          repurchase of preferred and common shares
                                                                                  
          cash and cash equivalents—beginning of year
                                                                                  
          cash and cash equivalents—end of year
                                                                                  
          supplemental disclosures of cash flow information:
                                                                                  
          cash paid for taxes
                                                                               346,000 3,198,000 3,213,000 
          noncash investing activity
                                                                                  
          purchase price of matteson comprised of promissory notes and other liabilities
                                                                                  
          net cash flows used in financing activities
                                                                                  
          net cash flows from by financing activities
                                                                                  
          loan to related party
                                                                                  
          issuance of common shares
                                                                                  
          adjustments to reconcile net income to net cash flows provided by operating activities:
                                                                                  
          from operating activities:
                                                                                  
          acquisition of controlling interest in nasdi
                                                                                  
          changes to restricted cash
                                                                                 
          borrowings under revolving loans—net
                                                                           19,177,000       
          net change in cash and equivalents
                                                                              3,293,000    
          cash and equivalents at beginning of period
                                                                         10,478,000 8,239,000 3,640,000 
          cash and equivalents at end of period
                                                                         2,315,000 3,337,000 6,287,000 6,733,000 -6,742,000 11,532,000 28,575,000 849,000 286,000 
          acquisition of controlling interest in yankee
                                                                                  
          adjustments to reconcile net income to net cash flows (used in) provided by operating activities:
                                                                                  
          operating activities
                                                                                  
          earnings of joint ventures
                                                                                  
          minority interest
                                                                            53,000 178,000    
          stock based compensation expense
                                                                                  
          investing activities
                                                                                  
          repayment of loan to related party
                                                                                  
          purchase of minority interest
                                                                                  
          financing activities
                                                                                  
          borrowings under revolving loans, net of repayments
                                                                            7,210,000 13,000,000 8,000,000 -34,500,000 46,000,000 3,000,000 
          cash proceeds from conversion of warrants
                                                                               60,180,000 30,483,000 1,105,000 
          financing fees
                                                                                  
          dividends
                                                                                  
          capital expenditures in accounts payable
                                                                            1,367,000 -1,865,000 4,291,000    
          stock-based compensation expense
                                                                                  
          cash proceeds from redemption of warrants
                                                                                  
          amortization of financing fees
                                                                               483,000 1,235,000 467,000 
          repayment from related party
                                                                                 1,703,000 
          non cash investing activity
                                                                               -2,259,000   
          repayment of note receivable from related party
                                                                                  
          adjustments to reconcile net income to net cash flows
                                                                                  
          minority interests
                                                                                 9,000 
          impairment of goodwill and intangible assets
                                                                                  
          other non-current assets and liabilities
                                                                                  
          acquisition of predecessor common and preferred shares
                                                                                  
          borrowings under (repayments of) revolving loans—net
                                                                                  
          repurchase of shares
                                                                                  
          issuance of shares
                                                                                  
          proceeds from aldabra transaction
                                                                                  
          payment of merger costs
                                                                                  
          cash and equivalents—beginning of period
                                                                                  
          cash and equivalents—end of period
                                                                                  
          supplemental cash flow information:
                                                                                  
          cash paid (refunded) for taxes