7Baggers

Comfort Systems USA, Inc
(NYSE:FIX) 

FIX stock logo

Comfort Systems USA, Inc. provides mechanical and electrical installation, renovation, maintenance, repair, and replacement services for the mechanical and electrical services industry in the United States. It engages in the design, engineering, integration, installation, and start-up of mechanical,...

Founded: 1997
Full Time Employees: 12,000
Sector: Industrials
Industry: Engineering & Construction
Industrials
Share this website to your friends
• Market Cap:
• Exchange:
• Shs Outstanding:
• Employees:
• Beta:
• Return on Equity (ROE) ttm:
• Return on Assets (ROA) ttm:
• EPS ttm:
• Book value per Share:
• Cash per Share:
• Current ast per Share:
• P/E ttm:
• P/E forward:
• P/E ttm high:
• P/E ttm low:
• P/S ttm:
• P/B ttm:
• P/FCF ttm:
• PEG ratio:
• Cash Ratio ttm:
• Quick Ratio ttm:
• Current Ratio ttm:
• Gross Mgn ttm:
• EBITDA Mgn ttm:
• Operating Mgn ttm:
• Net Income Mgn ttm:
• Trailing Div yield:
• Forward Div yield:
• Payout Ratio ttm:
• Ex-Dividend date:
• Target Price High:
• Target Price Low:
• Target Price Mean:
• Number of Analysts:
• Debt Ratio ttm:
• Debt to Equity ttm:
• Total Net Debt:
At a glance:
Bull Thesis:
Bear Thesis:
Main Competitors:
Moat:
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 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 2009-09-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                               
      revenue
    		2,865,332,000 2,646,067,000 2,450,969,000 2,173,319,000 1,831,286,000 1,867,804,000 1,812,366,000 1,810,290,000 1,537,016,000 1,357,566,000 1,378,124,000 1,296,430,000 1,174,640,000 1,117,188,000 1,120,012,000 1,017,948,000 885,216,000 856,084,000 833,896,000 713,895,000 669,761,000 698,961,000 714,099,000 743,468,000 700,131,000 719,584,000 706,918,000 650,302,000 538,473,000 588,359,000 594,536,000 535,043,000 464,941,000 461,072,000 480,851,000 465,411,000 380,588,000 392,100,000 428,760,000 427,538,000                    
      yoy
    		56.47% 41.67% 35.24% 20.05% 19.15% 37.58% 31.51% 39.64% 30.85% 21.52% 23.05% 27.36% 32.70% 30.50% 34.31% 42.59% 32.17% 22.48% 16.78% -3.98% -4.34% -2.87% 1.02% 14.33% 30.02% 22.30% 18.90% 21.54% 15.82% 27.61% 23.64% 14.96% 22.16% 17.59% 12.15% 8.86%                        
      qoq
    		8.29% 7.96% 12.78% 18.68% -1.96% 3.06% 0.11% 17.78% 13.22% -1.49% 6.30% 10.37% 5.14% -0.25% 10.03% 14.99% 3.40% 2.66% 16.81% 6.59% -4.18% -2.12% -3.95% 6.19% -2.70% 1.79% 8.71% 20.77% -8.48% -1.04% 11.12% 15.08% 0.84% -4.11% 3.32% 22.29% -2.94% -8.55% 0.29%                     
      cost of services
    		2,110,920,000 1,971,352,000 1,843,098,000 1,663,422,000 1,427,870,000 1,434,066,000 1,430,652,000 1,446,694,000 1,239,653,000 1,077,881,000 1,100,625,000 1,068,510,000 969,235,000 905,940,000 917,788,000 842,956,000 732,072,000 702,013,000 674,684,000 587,440,000 546,292,000 561,962,000 566,903,000 597,773,000 583,038,000 587,024,000 564,216,000 530,286,000 431,808,000 470,184,000 466,668,000 423,860,000 375,888,000 367,341,000 379,993,000 369,673,000 304,634,000 303,835,000 335,944,000 338,112,000 234,186,000    228,797,000 213,126,000 222,498,000 241,467,000 221,926,000 201,010,000 180,664,000 202,418,000 200,255,000 175,377,000      
      gross profit
    		754,412,000 674,715,000 607,871,000 509,897,000 403,416,000 433,738,000 381,714,000 363,596,000 297,363,000 279,685,000 277,499,000 227,920,000 205,405,000 211,248,000 202,224,000 174,992,000 153,144,000 154,071,000 159,212,000 126,455,000 123,469,000 136,999,000 147,196,000 145,695,000 117,093,000 132,560,000 142,702,000 120,016,000 106,665,000 118,175,000 127,868,000 111,183,000 89,053,000 93,731,000 100,858,000 95,738,000 75,954,000 88,265,000 92,816,000 89,426,000 57,405,000    51,723,000 36,514,000 45,576,000 46,209,000 42,464,000 36,844,000 36,930,000 41,035,000 40,114,000 29,313,000      
      yoy
    		87.01% 55.56% 59.25% 40.24% 35.66% 55.08% 37.56% 59.53% 44.77% 32.40% 37.22% 30.25% 34.13% 37.11% 27.02% 38.38% 24.03% 12.46% 8.16% -13.21% 5.45% 3.35% 3.15% 21.40% 9.78% 12.17% 11.60% 7.94% 19.78% 26.08% 26.78% 16.13% 17.25% 6.19% 8.66% 7.06% 32.31%    10.99%    21.80% -0.90% 23.41% 12.61% 5.86% 25.69%          
      qoq
    		11.81% 11.00% 19.21% 26.39% -6.99% 13.63% 4.98% 22.27% 6.32% 0.79% 21.75% 10.96% -2.77% 4.46% 15.56% 14.27% -0.60% -3.23% 25.90% 2.42% -9.88% -6.93% 1.03% 24.43% -11.67% -7.11% 18.90% 12.52% -9.74% -7.58% 15.01% 24.85% -4.99% -7.07% 5.35% 26.05% -13.95% -4.90% 3.79% 55.78%     41.65% -19.88% -1.37% 8.82% 15.25% -0.23% -10.00% 2.30% 36.85%       
      gross margin %
    		26.33% 25.50% 24.80% 23.46% 22.03% 23.22% 21.06% 20.08% 19.35% 20.60% 20.14% 17.58% 17.49% 18.91% 18.06% 17.19% 17.30% 18.00% 19.09% 17.71% 18.43% 19.60% 20.61% 19.60% 16.72% 18.42% 20.19% 18.46% 19.81% 20.09% 21.51% 20.78% 19.15% 20.33% 20.97% 20.57% 19.96% 22.51% 21.65% 20.92% Infinity% NaN% NaN% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% NaN% NaN% NaN% NaN%  
      selling, general and administrative expenses
    		268,996,000 248,365,000 229,579,000 210,466,000 194,874,000 207,635,000 180,177,000 179,537,000 162,723,000 160,026,000 142,935,000 136,430,000 135,032,000 131,650,000 121,194,000 118,724,000 117,776,000 105,259,000 95,287,000 87,549,000 88,214,000 88,920,000 90,888,000 85,045,000 92,924,000 86,588,000 90,006,000 84,506,000 78,905,000 80,458,000 75,297,000 71,208,000 70,023,000 70,033,000 66,707,000 66,599,000 63,247,000 62,956,000 61,032,000 61,023,000 41,713,000    35,207,000 34,377,000 34,324,000 32,139,000 30,414,000 30,134,000 27,272,000 29,613,000 30,752,000 28,077,000      
      gain on sale of assets
    		-302,000 -394,000 -582,000 -442,000 -556,000 -252,000 -1,347,000 -611,000 -820,000 -619,000 -579,000 -592,000 -512,000 -473,000 -406,000 -383,000 -323,000 -519,000 -180,000 -491,000 -350,000 -202,000 -377,000 -312,000 -554,000 -582,000 -708,000 -192,000 -219,000 -315,000 -219,000 -200,000 -211,000 -206,000 -184,000 -126,000 -154,000 -238,000 -166,000 -212,000 -101,000                   
      operating income
    		485,718,000 426,744,000 378,874,000 299,873,000 209,098,000 226,355,000 202,884,000 184,670,000 135,460,000 120,278,000 135,143,000 92,082,000 70,885,000 80,071,000 81,436,000 56,651,000 35,691,000 49,331,000 64,105,000 39,397,000 35,605,000 48,281,000 56,685,000 60,962,000 24,723,000 46,554,000 53,404,000 35,702,000 27,979,000 38,032,000 52,790,000 40,175,000 19,241,000 23,904,000 34,335,000 29,265,000 11,756,000 25,547,000 31,950,000 28,615,000 15,793,000    16,543,000 2,156,000 11,223,000 14,155,000 12,099,000 6,726,000 5,755,000 11,475,000 9,387,000 1,270,000      
      yoy
    		132.29% 88.53% 86.74% 62.38% 54.36% 88.19% 50.13% 100.55% 91.10% 50.21% 65.95% 62.54% 98.61% 62.31% 27.04% 43.80% 0.24% 2.17% 13.09% -35.37% 44.02% 3.71% 6.14% 70.75% -11.64% 22.41% 1.16% -11.13% 45.41% 59.10% 53.75% 37.28% 63.67% -6.43% 7.46% 2.27% -25.56%    -4.53%    36.73% -67.95% 95.01% 23.36% 28.89% 429.61%          
      qoq
    		13.82% 12.63% 26.34% 43.41% -7.62% 11.57% 9.86% 36.33% 12.62% -11.00% 46.76% 29.90% -11.47% -1.68% 43.75% 58.73% -27.65% -23.05% 62.72% 10.65% -26.25% -14.83% -7.02% 146.58% -46.89% -12.83% 49.58% 27.60% -26.43% -27.96% 31.40% 108.80% -19.51% -30.38% 17.32% 148.94% -53.98% -20.04% 11.65% 81.19%     667.30% -80.79% -20.71% 16.99% 79.88% 16.87% -49.85% 22.24% 639.13%       
      operating margin %
    		16.95% 16.13% 15.46% 13.80% 11.42% 12.12% 11.19% 10.20% 8.81% 8.86% 9.81% 7.10% 6.03% 7.17% 7.27% 5.57% 4.03% 5.76% 7.69% 5.52% 5.32% 6.91% 7.94% 8.20% 3.53% 6.47% 7.55% 5.49% 5.20% 6.46% 8.88% 7.51% 4.14% 5.18% 7.14% 6.29% 3.09% 6.52% 7.45% 6.69% Infinity% NaN% NaN% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% NaN% NaN% NaN% NaN%  
      other income:
    		                                                           
      interest income
    		8,512,000 8,137,000 6,381,000 2,819,000 4,267,000 4,862,000 3,825,000 1,264,000 1,603,000 1,051,000 952,000 92,000 1,397,000 32,000 5,000 6,000 3,000 17,000 1,000 3,000 3,000 4,000 7,000 28,000 64,000 50,000 82,000 67,000 25,000 20,000 25,000 14,000 14,000 15,000 16,000 28,000 11,000 3,000 3,000 2,000 117,000    674,000 715,000 659,000 718,000 562,000 647,000 337,000 165,000 136,000 128,000      
      interest expense
    		-2,178,000 -2,811,000 -2,974,000 -1,605,000 -1,619,000 -1,576,000 -1,730,000 -1,709,000 -1,633,000 -401,000 -1,886,000 -3,918,000 -4,076,000 -4,588,000 -3,609,000 -3,026,000 -2,129,000 -1,753,000 -1,586,000 -1,360,000 -1,497,000 -1,481,000 -1,733,000 -2,554,000 -2,617,000 -2,426,000 -2,779,000 -3,050,000 -1,062,000 -1,109,000 -1,152,000 -736,000 -713,000 -764,000 -961,000 -1,041,000 -390,000 -475,000 -563,000 -606,000 -301,000                   
      changes in the fair value of contingent earn-out obligations
    		-10,370,000 -13,539,000 -12,103,000 -4,073,000 -3,758,000 -43,712,000 -17,254,000 -14,689,000 -12,491,000 -9,400,000 -8,727,000 -3,098,000 -2,382,000 -5,349,000 -3,443,000 -115,000 4,088,000 3,297,000 -1,244,000 4,581,000 1,186,000 7,295,000 3,423,000 -3,871,000 2,272,000 933,000 -2,004,000 -1,762,000 -158,000 -2,559,000 434,000 -94,000 153,000 1,870,000 2,469,000 -598,000 -26,000 263,000 804,000 -336,000                    
      other
    		464,000 -32,000 280,000 -530,000 24,000 109,000 87,000 119,000 117,000 201,000 -44,000 44,000 1,000 33,000 46,000 -1,000 56,000 76,000 20,000 161,000 -69,000 42,000 -15,000  25,000 20,000 3,000 149,000 15,000 79,000 39,000 3,985,000 38,000 992,000 10,000 29,000 18,000 642,000 80,000 -111,000 3,000    24,000 33,000 68,000 14,000  19,000 71,000  65,000 11,000      
      other income
    		-3,572,000 -8,245,000 -8,416,000 -3,389,000 -1,086,000 -40,317,000 -15,072,000 -15,015,000 -12,404,000 -8,549,000 -9,705,000 -6,880,000 -5,060,000 -9,872,000 -7,001,000 -3,136,000 2,018,000 1,637,000 -2,809,000 3,385,000 -377,000 5,860,000 1,682,000 -6,397,000 -256,000 -1,423,000 -4,698,000 -4,596,000 -1,180,000 -3,569,000 -654,000 3,169,000 -508,000 2,113,000 1,534,000 -1,582,000 -387,000 433,000 324,000 -1,051,000 -181,000    553,000 584,000 575,000 569,000 415,000 511,000          
      income before income taxes
    		482,146,000 418,499,000 370,458,000 296,484,000 208,012,000 186,038,000 187,812,000 169,655,000 123,056,000 111,729,000 125,438,000 85,202,000 65,825,000 70,199,000 74,435,000 53,515,000 37,709,000 50,968,000 61,296,000 42,782,000 35,228,000 54,141,000 58,367,000 54,565,000 24,467,000 45,131,000 48,706,000 31,106,000 26,799,000 34,463,000 52,136,000 43,344,000 18,733,000 26,017,000 35,869,000 27,683,000 11,369,000 25,980,000 32,274,000 27,564,000 15,612,000    17,096,000 2,740,000 11,798,000 14,724,000 12,514,000 7,237,000 5,422,750 11,435,000 8,335,000 1,034,000      
      provision for income taxes
    		111,768,000 87,693,000 78,843,000 65,636,000 38,723,000 40,168,000 41,577,000 35,646,000 26,737,000 20,148,000 20,313,000 15,726,000 8,609,000 14,775,000 12,920,000 11,269,000 -49,053,000 13,373,000 14,999,000 9,817,000 8,737,000 11,301,000 8,279,000 15,070,000 6,751,000 11,079,000 12,473,000 6,933,000 6,933,000 9,307,000 13,595,000 10,797,000 2,074,000                           
      net income
    		370,378,000 330,806,000 291,615,000 230,848,000 169,289,000 145,870,000 146,235,000 134,009,000 96,319,000 91,581,000 105,125,000 69,476,000 57,216,000 55,424,000 61,515,000 42,246,000 86,762,000 37,595,000 46,297,000 32,965,000 26,491,000 42,840,000 50,088,000 39,495,000 17,716,000 34,052,000 36,233,000 24,173,000 19,866,000 25,156,000 38,541,000 32,547,000 16,659,000 11,933,250 22,284,000 17,972,000 7,477,000   0.47 9,540,000    10,501,000 1,806,000 7,514,000 8,962,000 7,921,000 4,327,000 -17,564,000 6,131,000 4,678,000 529,000      
      yoy
    		118.78% 126.78% 99.42% 72.26% 75.76% 59.28% 39.11% 92.89% 68.34% 65.24% 70.89% 64.46% -34.05% 47.42% 32.87% 28.15% 227.52% -12.24% -7.57% -16.53% 49.53% 25.81% 38.24% 63.38% -10.82% 35.36% -5.99% -25.73% 19.25% 110.81% 72.95% 81.10% 122.80%   3823829687.23% -21.62%    -9.15%    32.57% -58.26% -142.78% 46.18% 69.32% 717.96%          
      qoq
    		11.96% 13.44% 26.32% 36.36% 16.05% -0.25% 9.12% 39.13% 5.17% -12.88% 51.31% 21.43% 3.23% -9.90% 45.61% -51.31% 130.78% -18.80% 40.44% 24.44% -38.16% -14.47% 26.82% 122.93% -47.97% -6.02% 49.89% 21.68% -21.03% -34.73% 18.42% 95.37% 39.60% -46.45% 23.99% 140.36%    -100.00%     481.45% -75.96% -16.16% 13.14% 83.06% -124.64% -386.48% 31.06% 784.31%       
      net income margin %
    		12.93% 12.50% 11.90% 10.62% 9.24% 7.81% 8.07% 7.40% 6.27% 6.75% 7.63% 5.36% 4.87% 4.96% 5.49% 4.15% 9.80% 4.39% 5.55% 4.62% 3.96% 6.13% 7.01% 5.31% 2.53% 4.73% 5.13% 3.72% 3.69% 4.28% 6.48% 6.08% 3.58% 2.59% 4.63% 3.86% 1.96% 0% 0% 0.00% Infinity% NaN% NaN% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% Infinity% Infinity% NaN% NaN% NaN% NaN%  
      income per share:
    		                                                           
      basic
    		10.52 9.38 8.26 6.54 4.77 4.1 4.1 3.75 2.7 2.56 2.93 1.94 1.6 1.54 1.72 1.17 2.4 1.04 1.28 0.91 0.73 1.18 1.37 1.08 0.48 0.92 0.98 0.65 0.54 0.67 1.03 0.87 0.45 0.2 0.6 0.48 0.2 0.32 0.55                     
      diluted
    		10.51 9.36 8.25 6.53 4.75 4.08 4.09 3.74 2.69 2.55 2.93 1.93 1.59 1.54 1.71 1.17 2.4 1.03 1.27 0.9 0.73 1.17 1.36 1.08 0.48 0.92 0.98 0.65 0.53 0.67 1.02 0.87 0.44 0.2 0.59 0.48 0.2 0.318 0.54                     
      shares used in computing income per share:
    		                                                           
      basic
    		35,207 -30 35,307 35,307 35,524 -29 35,669 35,746 35,739 -17 35,820 35,822 35,812 -34 35,853 35,970 36,076 -43 36,296 36,403 36,286 -62 36,557 36,581 36,674 -37 36,805 36,943 36,923 -34 37,294 37,220 37,192 -20 37,232 37,296 37,225 -45 37,360 37,437 37,995    40,655 40,499 70 40,406 40,244 39,857 118 39,372 39,173 38,990      
      diluted
    		35,251 -32 35,365 35,369 35,605 -29 35,755 35,828 35,828 -15 35,917 35,906 35,907 -32 35,972 36,073 36,188 -50 36,434 36,566 36,499 -59 36,750 36,737 36,905 -39 37,051 37,223 37,234 -42 37,667 37,605 37,628 -12 37,626 37,705 37,724 -43 37,821 37,911 38,382    41,407 41,303 48 41,242 41,209 40,862 -881 40,382 40,107 40,062      
      dividends per share
    		                   0.115 0.115 0.111 0.105 0.105 0.105 0.1 0.1 0.1 0.095 0.09 0.085 0.08 0.075 0.075 0.075 0.075 0.07 0.07 0.07 0.07 0.05    0.035 0.035              
      goodwill impairment
    		                                    1,105,000                       
      income tax expense
    		                                 6,797,000 13,585,000 9,711,000 3,892,000 9,113,000 11,803,000 9,847,000 6,072,000    6,595,000 934,000 4,299,000 5,757,000 4,797,000 2,910,000 4,575,000 4,971,000 3,730,000 505,000      
      net income including noncontrolling interests
    		                                     16,867,000 20,471,000 17,717,000                    
      less: net income attributable to noncontrolling interests
    		                                                           
      net income attributable to comfort systems usa, inc.
    		                                     16,867,000 20,471,000 17,717,000                    
      income per share attributable to comfort systems usa, inc.:
    		                                                           
      basic
    		10.52 9.38 8.26 6.54 4.77 4.1 4.1 3.75 2.7 2.56 2.93 1.94 1.6 1.54 1.72 1.17 2.4 1.04 1.28 0.91 0.73 1.18 1.37 1.08 0.48 0.92 0.98 0.65 0.54 0.67 1.03 0.87 0.45 0.2 0.6 0.48 0.2 0.32 0.55                     
      diluted
    		10.51 9.36 8.25 6.53 4.75 4.08 4.09 3.74 2.69 2.55 2.93 1.93 1.59 1.54 1.71 1.17 2.4 1.03 1.27 0.9 0.73 1.17 1.36 1.08 0.48 0.92 0.98 0.65 0.53 0.67 1.02 0.87 0.44 0.2 0.59 0.48 0.2 0.318 0.54                     
      income per share attributable to comfort systems usa, inc.:
    		                                                           
      basic—
    		                                                           
      diluted—
    		                                                           
      revenues
    		                                        291,591,000    280,520,000 249,640,000 268,074,000 287,676,000 264,390,000 237,854,000 217,594,000 243,453,000 240,369,000 204,690,000      
      income from continuing operations
    		                                        9,540,000    10,501,000 1,806,000 7,499,000 8,967,000 7,717,000 4,327,000 -12,239,000.42 6,464,000 4,605,000 529,000      
      discontinued operations:
    		                                                           
      operating income, net of income tax benefit of (46), ―, (145), and 133
    		                                                           
      estimated loss on disposition, net of tax of —, —, —, and —
    		                                                           
      income per share:
    		                                                           
      basic —
    		                                                           
      discontinued operations —
    		                                                           
      income from operations
    		                                                           
      estimated loss on disposition
    		                                                           
      diluted —
    		                                                           
      operating income, net of income tax benefit (expense) of , —, 105 and —
    		                                                           
      estimated gain on disposition, including income tax benefit of 209, —, 209 and —
    		                                                           
      discontinued operations—
    		                                                           
      estimated gain on disposition
    		                                                0.01           
      operating income, net of income tax benefit of 111 and —
    		                                                           
      write off of debt costs
    		                                                           
      operating income, net of income tax benefit of 242, 27, 656, and 132
    		                                                           
      estimated gain on disposition, including income tax benefit (expense) of 17, 0, (65), and 209
    		                                              52,250             
      operating loss, net of income tax benefit of 25, , 414, and 105
    		                                                           
      estimated gain on disposition, including income tax benefit of (82), 209, (82), and 209
    		                                                209,000           
      operating loss, net of income tax expense of 8
    		                                                           
      loss on sale of assets
    		                                                           
      operating income, net of income tax expense of 80,
    		                                                           
      estimated gain on disposition, including income tax expense of 0, (17), 235 and 65
    		                                                  24,750         
      operating income, net of income tax expense of (37), 15, 20, and 16
    		                                                           
      estimated gain on disposition, including income tax expense of 235, 82, 235 and 82
    		                                                    137,000       
      operating income, net of income tax expense of 23
    		                                                           
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 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 2009-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 
                                                          
        assets
      		                                                    
        current assets:
      		                                                    
        cash and cash equivalents
      		1,050,164,000 981,898,000 860,523,000 331,710,000 204,758,000 549,939,000 415,583,000 199,419,000 100,792,000 205,150,000 137,623,000 60,007,000 48,560,000 57,214,000 71,139,000 69,129,000 115,615,000 58,776,000 67,721,000 53,659,000 52,116,000 54,896,000 70,540,000 53,253,000 133,264,000 50,788,000 40,363,000 36,787,000 29,130,000 45,620,000 19,248,000 28,001,000 25,219,000 36,542,000 29,496,000 34,465,000 31,444,000 32,074,000 25,337,000 38,282,000 139,863,000 87,932,000 69,038,000 90,286,000 68,918,000 67,091,000 58,361,000 55,593,000 33,709,000 26,455,000 22,454,000 32,576,000 
        billed accounts receivable, less allowance for credit losses of 19,991 and 19,708, respectively
      		2,805,270,000                                                    
        unbilled accounts receivable, less allowance for credit losses of 1,746 and 1,508, respectively
      		137,070,000                                                    
        other receivables, less allowance for credit losses of 267 and 325, respectively
      		108,885,000                                                    
        inventories
      		93,947,000 84,066,000 78,830,000 70,732,000 63,045,000 59,224,000 55,680,000 63,778,000 71,061,000 65,538,000 53,899,000 41,619,000 37,013,000 35,309,000 38,149,000 31,246,000 24,918,000 21,853,000 19,908,000 18,837,000 15,653,000 13,472,000 12,700,000 12,212,000 10,312,000 10,053,000 12,667,000 12,734,000 12,908,000 12,416,000 12,795,000 11,986,000 11,029,000 10,303,000 10,778,000 10,571,000 9,958,000 9,208,000 9,719,000 9,953,000 9,412,000 9,963,000 10,309,000 8,762,000 9,609,000 9,569,000 8,276,000 8,107,000 9,196,000 9,831,000 10,376,000 10,590,000 
        prepaid expenses and other
      		177,588,000 138,560,000 63,160,000 37,991,000 50,859,000 46,213,000 36,087,000 45,486,000 62,500,000 54,309,000 42,687,000 50,482,000 47,190,000 48,456,000 27,372,000 28,836,000 31,373,000 23,704,000 11,519,000 11,350,000 13,812,000 15,510,000 10,313,000 10,453,000 14,612,000 14,396,000 8,788,000 7,250,000 7,476,000 6,544,000 6,329,000 5,183,000 6,135,000 8,294,000 11,622,000 5,611,000 5,997,000 6,106,000 7,139,000 6,150,000 26,694,000 10,709,000 11,280,000 13,644,000 15,338,000 11,056,000 11,680,000 11,489,000 14,038,000 13,053,000 13,986,000 13,338,000 
        costs and estimated earnings in excess of billings, less allowance for credit losses of 505 and 255, respectively
      		128,007,000                                                    
        total current assets
      		4,500,931,000 4,110,553,000 3,703,528,000 3,043,279,000 2,597,499,000 2,790,241,000 2,536,899,000 2,323,371,000 2,048,189,000 1,911,100,000 1,812,232,000 1,500,323,000 1,459,024,000 1,307,671,000 1,358,091,000 1,238,223,000 1,139,629,000 1,027,321,000 904,711,000 819,400,000 762,572,000 811,852,000 811,296,000 792,505,000 878,443,000 790,184,000 750,402,000 726,582,000 557,272,000 609,700,000 599,679,000 561,823,000 491,793,000 489,357,000 495,377,000 497,169,000 396,453,000 415,957,000 422,864,000 434,539,000 430,716,000 394,225,000 356,387,000 376,385,000 369,749,000 351,487,000 315,459,000 325,399,000 294,922,000 278,251,000 254,259,000 260,729,000 
        property and equipment
      		515,796,000 387,952,000 337,452,000 311,249,000 295,098,000 277,180,000 250,150,000 240,319,000 226,197,000 208,568,000 186,864,000 170,089,000 155,021,000 143,949,000 138,229,000 132,646,000 127,711,000 128,554,000 115,538,000 113,589,000 115,039,000 117,206,000 119,131,000 121,569,000 113,974,000 109,796,000 108,129,000 108,343,000 102,774,000 99,618,000 102,960,000 91,898,000 88,298,000 87,591,000 74,883,000 74,539,000 68,593,000 68,195,000 66,490,000 65,053,000  17,813,000 17,086,000 15,504,000 15,197,000 14,063,000 13,547,000 12,844,000 13,889,000 13,904,000 13,958,000 12,988,000 
        lease right-of-use assets
      		321,652,000 322,922,000                                                   
        goodwill
      		1,025,515,000 1,025,515,000 928,168,000 927,780,000 905,843,000 875,270,000 875,193,000 874,947,000 862,934,000 666,834,000 637,487,000 637,487,000 637,434,000 611,789,000 611,039,000 611,000,000 593,947,000 592,114,000 526,964,000 472,046,000 472,778,000 464,392,000 420,782,000 420,782,000 347,391,000 332,447,000 332,200,000 332,562,000 235,860,000 235,182,000 231,190,000 205,162,000 203,199,000 200,584,000 203,771,000 203,223,000 148,103,000 149,208,000 148,140,000 147,512,000 95,590,000 65,833,000 65,960,000 62,954,000 62,954,000 62,954,000 62,954,000 62,954,000 100,123,000 100,123,000 100,123,000 100,123,000 
        identifiable intangible assets
      		464,774,000 485,168,000 431,921,000 451,446,000 441,502,000 434,417,000 456,459,000 480,880,000 489,884,000 280,397,000 274,128,000 285,057,000 296,070,000 273,901,000 285,094,000 296,538,000 291,990,000 304,781,000 268,099,000 221,584,000 230,408,000 231,807,000 201,998,000 210,164,000 167,675,000 159,974,000 166,736,000 173,996,000 91,073,000 95,275,000 98,712,000 77,968,000 78,332,000 76,044,000 78,527,000 83,269,000 40,873,000 42,435,000 44,993,000 47,028,000 13,841,000            
        deferred tax assets
      		83,183,000 84,139,000 77,904,000 84,344,000 83,409,000 85,441,000 50,234,000 50,112,000 31,928,000 17,723,000 5,959,000 170,965,000 143,202,000 115,665,000 11,327,000 16,594,000 20,577,000 22,905,000 22,812,000 23,952,000 29,811,000 29,401,000 21,656,000 25,833,000 21,803,000 21,923,000 20,254,000 17,176,000 17,485,000 17,634,000 20,018,000 17,138,000 16,890,000 22,966,000                   
        other noncurrent assets
      		26,495,000 24,920,000 24,181,000 19,201,000 19,247,000 19,433,000 18,529,000 17,634,000 16,540,000 15,245,000 14,811,000 15,664,000 13,965,000 13,837,000 12,250,000 11,940,000 9,623,000 8,683,000 8,874,000 8,847,000 8,140,000 7,970,000 7,291,000 7,004,000 6,480,000 6,615,000 5,458,000 5,304,000 5,252,000 5,155,000 7,381,000 5,177,000 4,206,000 4,578,000 4,747,000 5,238,000 5,343,000 5,938,000 6,068,000 6,138,000 1,506,000 6,531,000 6,815,000 6,031,000 4,336,000 6,421,000 7,180,000 7,486,000 7,258,000 7,808,000 8,738,000 9,276,000 
        total assets
      		6,938,346,000 6,441,169,000 5,777,851,000 5,063,729,000 4,569,218,000 4,711,088,000 4,412,765,000 4,213,984,000 3,902,829,000 3,305,579,000 3,140,619,000 2,915,117,000 2,839,471,000 2,597,478,000 2,549,473,000 2,439,622,000 2,308,413,000 2,209,114,000 1,951,334,000 1,754,950,000 1,715,530,000 1,757,355,000 1,677,969,000 1,675,443,000 1,618,067,000 1,505,012,000 1,467,460,000 1,444,596,000 1,080,032,000 1,062,564,000 1,059,940,000 959,166,000 882,718,000 881,120,000 884,587,000 893,155,000 687,612,000 708,903,000 717,742,000 729,013,000 581,326,000 484,402,000 446,248,000 460,874,000 452,236,000 434,925,000 399,140,000 408,683,000 416,192,000 400,086,000 377,078,000 383,116,000 
        liabilities and stockholders’ equity
      		                                                    
        current liabilities:
      		                                                    
        current maturities of long-term debt
      		25,000 6,163,000 4,676,000 11,689,000 4,066,000 6,042,000 6,046,000 17,686,000 12,885,000 4,867,000 13,333,000 13,334,000 11,468,000 9,000,000 2,514,000 2,448,000 407,000 2,788,000 5,958,000 4,235,000   70,000 85,000 850,000 20,817,000 13,847,000 10,380,000 2,755,000 3,279,000 3,279,000 1,113,000 1,113,000 613,000 618,000 1,113,000 1,112,000 600,000 100,000 600,000          65,000 2,068,000 2,071,000 
        accounts payable
      		719,590,000 696,348,000 665,132,000 573,267,000 560,663,000 654,943,000 603,546,000 590,529,000 557,859,000 419,962,000 441,128,000 396,181,000 351,509,000 337,385,000 330,288,000 293,964,000 267,246,000 254,788,000 236,387,000 207,453,000 184,499,000 204,145,000 176,484,000 202,075,000 184,627,000 196,195,000 176,624,000 165,119,000 136,115,000 176,167,000 150,880,000 145,374,000 128,249,000 132,011,000 122,203,000 124,326,000 98,132,000 103,440,000 106,165,000 116,101,000 75,291,000 80,669,000 75,971,000 81,180,000 82,237,000 76,231,000 67,945,000 72,154,000 69,153,000 73,150,000 60,005,000 64,771,000 
        accrued compensation and benefits
      		278,182,000 291,722,000 356,397,000 264,495,000 191,950,000 228,622,000 258,174,000 209,390,000 153,859,000 169,136,000 174,425,000 141,626,000 115,606,000 127,765,000 149,926,000 137,913,000 121,990,000 129,971,000 137,910,000 115,797,000 104,590,000 121,864,000 119,931,000 101,243,000 81,305,000 102,891,000 100,390,000 82,227,000 65,135,000 87,388,000 81,888,000 66,128,000 56,199,000 69,217,000 68,294,000 59,857,000 51,221,000 61,712,000 60,200,000 57,991,000 42,366,000 30,146,000 24,650,000 35,058,000 30,775,000 25,729,000 22,782,000 29,814,000 27,006,000 25,066,000 20,271,000 22,834,000 
        billings in excess of costs and estimated earnings and deferred revenue
      		2,345,279,000 2,120,262,000 1,734,272,000 1,546,306,000 1,267,373,000 1,149,257,000 1,197,532,000 1,149,896,000 1,131,928,000 909,538,000 775,302,000 696,371,000 717,294,000                                        
        accrued self-insurance
      		37,933,000 42,973,000 41,990,000 35,121,000 35,413,000 42,315,000 36,924,000 31,881,000 29,712,000 27,774,000 25,913,000 25,764,000 23,865,000 27,644,000 25,320,000 20,967,000 22,410,000 22,227,000 19,930,000 47,359,000 48,106,000 49,166,000 49,369,000 46,099,000 42,027,000 39,546,000 40,750,000 39,000,000 37,615,000 36,386,000 33,531,000 32,524,000 32,099,000 32,228,000 32,774,000 34,987,000 33,846,000 33,520,000 29,280,000 29,194,000             
        other current liabilities
      		249,784,000 236,382,000 229,756,000 268,721,000 351,779,000 501,591,000 326,921,000 335,566,000 253,416,000 189,928,000 198,886,000 208,200,000 186,917,000 120,715,000 124,015,000 126,630,000 128,668,000 119,400,000 97,499,000 91,209,000 106,096,000 91,492,000 92,035,000 105,937,000 75,710,000 81,630,000 79,024,000 65,035,000 47,933,000 32,852,000 45,116,000 39,211,000 40,437,000 33,654,000 46,774,000 55,485,000 31,767,000 34,261,000 36,355,000 34,378,000 29,702,000 14,137,000 14,804,000 15,171,000 15,605,000 14,480,000 13,736,000 14,686,000 12,781,000 29,853,000 29,686,000 29,288,000 
        total current liabilities
      		3,630,793,000 3,393,850,000 3,032,223,000 2,699,599,000 2,411,244,000 2,582,770,000 2,429,143,000 2,334,948,000 2,139,659,000 1,721,205,000 1,628,987,000 1,481,476,000 1,406,659,000 1,170,802,000 1,044,005,000 968,180,000 857,199,000 836,554,000 742,262,000 721,410,000 691,688,000 692,904,000 655,343,000 681,486,000 599,625,000 607,997,000 577,732,000 527,050,000 409,843,000 467,058,000 445,846,000 418,312,000 366,036,000 373,728,000 373,802,000 375,416,000 293,043,000 317,681,000 313,698,000 326,597,000 265,949,000 228,208,000 200,840,000 218,160,000 216,212,000 207,153,000 180,608,000 195,160,000 185,736,000 176,560,000 152,516,000 159,768,000 
        long-term debt
      		39,054,000 139,063,000 131,322,000 61,331,000 63,776,000 62,293,000 62,315,000 73,377,000 77,004,000 39,345,000 33,932,000 133,945,000 197,761,000 247,245,000 378,192,000 403,192,000 412,079,000 385,242,000 266,772,000 156,272,000 171,752,000 235,733,000 222,213,000 231,442,000 333,113,000 205,318,000 228,167,000 284,667,000 74,483,000 73,639,000 93,672,000 57,864,000 64,880,000 59,926,000 80,951,000 103,468,000 693,000 1,955,000 27,480,000 38,505,000          219,000 6,235,000 6,751,000 
        lease liabilities
      		300,005,000 302,590,000 258,056,000 210,630,000 210,364,000 212,107,000 208,268,000 208,710,000 209,717,000 188,136,000 191,451,000 115,302,000 115,018,000 111,744,000 114,443,000 113,650,000 107,033,000 107,701,000 88,923,000 81,060,000 82,661,000 80,576,000 81,638,000 83,753,000 70,410,000 72,697,000 73,213,000 70,095,000                         
        deferred tax liabilities
      		3,892,000 3,892,000 2,225,000 2,225,000 2,225,000 2,225,000 1,120,000 1,120,000 1,120,000 1,120,000 6,649,000    1,745,000 1,745,000 1,745,000 1,745,000 1,339,000 1,339,000 1,339,000 1,339,000 3,365,000 3,365,000 1,425,000 1,425,000 1,387,000 1,387,000 1,387,000 1,387,000 4,835,000 4,835,000 4,835,000 2,263,000                   
        other long-term liabilities
      		149,554,000 153,000,000 120,639,000 118,735,000 104,596,000 147,017,000 124,197,000 113,535,000 102,793,000 77,944,000 72,438,000 72,930,000 66,543,000 67,764,000 59,956,000 56,010,000 51,949,000 72,206,000 80,249,000 42,857,000 44,987,000 50,374,000 47,284,000 46,964,000 20,451,000 32,271,000 29,331,000 29,309,000 17,096,000 22,433,000 22,820,000 17,180,000 17,829,000 27,258,000 15,583,000 15,025,000 9,563,000 10,252,000 9,651,000 9,245,000 5,677,000 1,572,000 1,459,000          
        total liabilities
      		4,123,298,000 3,992,395,000 3,544,465,000 3,092,520,000 2,792,205,000 3,006,412,000 2,825,043,000 2,731,690,000 2,530,293,000 2,027,750,000 1,933,457,000 1,803,653,000 1,785,981,000 1,597,555,000 1,598,341,000 1,542,777,000 1,430,005,000 1,403,448,000 1,179,545,000 1,002,938,000 992,427,000 1,060,926,000 1,009,843,000 1,047,010,000 1,025,024,000 919,708,000 909,830,000 912,508,000 564,837,000 564,517,000 567,173,000 498,191,000 453,580,000 463,175,000 472,658,000 496,243,000 305,656,000 332,270,000 352,762,000 376,314,000 278,233,000 229,780,000 202,299,000 218,160,000 216,212,000 207,153,000 180,608,000 195,160,000 185,736,000 176,779,000 158,751,000 166,519,000 
        commitments and contingencies
      		                                                    
        stockholders’ equity:
      		                                                    
        preferred stock, .01 par, 5,000,000 shares authorized, none issued and outstanding
      		                                                    
        common stock
      		411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 411,000 409,000 407,000 407,000 407,000 403,000 400,000 397,000 396,000 396,000 393,000 
        treasury stock
      		-500,449,000 -496,006,000 -401,121,000 -388,298,000 -367,508,000 -273,799,000 -256,775,000 -225,573,000 -211,518,000 -209,807,000 -197,085,000 -195,290,000 -191,411,000 -187,212,000 -185,574,000 -183,024,000 -164,844,000 -150,580,000 -150,987,000 -128,503,000 -128,589,000 -129,243,000 -118,551,000 -112,104,000 -112,513,000 -103,960,000 -101,243,000 -93,947,000 -90,171,000 -87,747,000 -71,084,000 -67,386,000 -69,322,000 -63,519,000 -64,312,000 -59,219,000 -58,789,000 -57,387,000 -56,079,000 -50,026,000 -30,324,000 -220,000   -18,000 -306,000 -316,000      
        additional paid-in capital
      		388,276,000 363,314,000 362,688,000 361,662,000 361,653,000 350,734,000 350,182,000 349,099,000 348,582,000 339,562,000 338,830,000 338,413,000 338,884,000 332,080,000 331,710,000 331,375,000 331,978,000 327,061,000 326,493,000 326,179,000 326,143,000 322,451,000 322,304,000 322,419,000 323,103,000 320,168,000 320,157,000 319,879,000 319,691,000 316,479,000 316,354,000 316,235,000 315,907,000 312,784,000 312,312,000 311,692,000 311,481,000 309,625,000 310,930,000 310,448,000 325,458,000 339,446,000 339,056,000 339,589,000 340,431,000 341,429,000 340,124,000 340,264,000 339,767,000 338,763,000 339,237,000 337,719,000 
        retained earnings
      		2,926,810,000 2,581,055,000 2,271,408,000 1,997,434,000 1,782,457,000 1,627,330,000 1,493,904,000 1,358,357,000 1,235,061,000 1,147,663,000 1,065,006,000 967,930,000 905,606,000 854,644,000 804,585,000 748,083,000 710,863,000 628,774,000 595,872,000 553,925,000 525,138,000 502,810,000 463,962,000 417,707,000 382,042,000 368,685,000 338,305,000 305,745,000 285,264,000 268,904,000 247,086,000 211,715,000 182,142,000 168,269,000 163,518,000 144,028,000 128,853,000 123,984,000 109,718,000 91,866,000 7,765,000 -85,015,000 -95,516,000  -104,796,000 -113,758,000 -121,679,000  -108,442,000 -114,573,000   
        total stockholders’ equity
      		2,815,048,000 2,448,774,000 2,233,386,000 1,971,209,000 1,777,013,000 1,704,676,000 1,587,722,000 1,482,294,000 1,372,536,000 1,277,829,000 1,207,162,000 1,111,464,000 1,053,490,000 999,923,000 951,132,000 896,845,000 878,408,000 805,666,000 771,789,000 752,012,000 723,103,000 696,429,000 668,126,000 628,433,000 593,043,000 585,304,000 557,630,000 532,088,000 515,195,000 498,047,000 492,767,000 460,975,000 429,138,000 417,945,000 411,929,000 396,912,000 381,956,000 376,633,000 364,980,000 352,699,000 303,093,000 254,622,000 243,949,000 242,714,000 236,024,000 227,772,000 218,532,000 213,523,000 230,456,000 223,307,000 218,327,000 216,597,000 
        total liabilities and stockholders’ equity
      		6,938,346,000 6,441,169,000 5,777,851,000 5,063,729,000 4,569,218,000 4,711,088,000 4,412,765,000 4,213,984,000 3,902,829,000 3,305,579,000 3,140,619,000 2,915,117,000 2,839,471,000 2,597,478,000 2,549,473,000 2,439,622,000 2,308,413,000 2,209,114,000 1,951,334,000 1,754,950,000 1,715,530,000 1,757,355,000 1,677,969,000 1,675,443,000 1,618,067,000 1,505,012,000 1,467,460,000 1,444,596,000 1,080,032,000 1,062,564,000 1,059,940,000 959,166,000 882,718,000 881,120,000 884,587,000 893,155,000 687,612,000 708,903,000 717,742,000 729,013,000 581,326,000 484,402,000 446,248,000 460,874,000 452,236,000 434,925,000 399,140,000 408,683,000 416,192,000 400,086,000 377,078,000 383,116,000 
        billed accounts receivable, less allowance for credit losses of 19,708 and 15,286, respectively
      		 2,577,858,000                                                   
        unbilled accounts receivable, less allowance for credit losses of 1,508 and 1,475, respectively
      		 123,197,000                                                   
        other receivables, less allowance for credit losses of 325 and 553, respectively
      		 116,157,000                                                   
        costs and estimated earnings in excess of billings, less allowance for credit losses of 255 and 271, respectively
      		 88,817,000                                                   
        billed accounts receivable, less allowance for credit losses of 18,645 and 15,286, respectively
      		  2,306,295,000                                                  
        unbilled accounts receivable, less allowance for credit losses of 2,153 and 1,475, respectively
      		  145,615,000                                                  
        other receivables, less allowance for credit losses of 435 and 553, respectively
      		  85,755,000                                                  
        costs and estimated earnings in excess of billings, less allowance for credit losses of 470 and 271, respectively
      		  163,350,000                                                  
        lease right-of-use asset
      		  274,697,000 226,430,000 226,620,000 229,106,000 225,301,000 226,721,000 227,157,000 205,712,000 209,138,000 135,532,000 134,755,000 130,666,000 133,443,000 132,681,000 124,936,000 124,756,000 104,336,000 95,532,000 96,782,000 94,727,000 95,815,000 97,586,000 82,301,000 84,073,000 84,281,000 80,633,000 70,316,000                        
        billed accounts receivable, less allowance for credit losses of 17,028 and 15,286, respectively
      		   2,162,345,000                                                 
        unbilled accounts receivable, less allowance for credit losses of 2,250 and 1,475, respectively
      		   149,721,000                                                 
        other receivables, less allowance for credit losses of 424 and 553, respectively
      		   87,376,000                                                 
        costs and estimated earnings in excess of billings, less allowance for credit losses of 585 and 271, respectively
      		   203,404,000                                                 
        billed accounts receivable, less allowance for credit losses of 15,632 and 15,286, respectively
      		    1,736,976,000                                                
        unbilled accounts receivable, less allowance for credit losses of 1,539 and 1,475, respectively
      		    110,496,000                                                
        other receivables, less allowance for credit losses of 503 and 553, respectively
      		    203,687,000                                                
        costs and estimated earnings in excess of billings, less allowance for credit losses of 697 and 271, respectively
      		    227,678,000                                                
        billed accounts receivable, less allowance for credit losses of 15,286 and 11,926, respectively
      		     1,861,212,000                                               
        unbilled accounts receivable, less allowance for credit losses of 1,475 and 850, respectively
      		     95,786,000                                               
        other receivables, less allowance for credit losses of 553 and 522, respectively
      		     86,186,000                                               
        costs and estimated earnings in excess of billings, less allowance for credit losses of 271 and 79, respectively
      		     91,681,000                                               
        billed accounts receivable, less allowance for credit losses of 15,280 and 11,926, respectively
      		      1,730,960,000                                              
        unbilled accounts receivable, less allowance for credit losses of 953 and 850, respectively
      		      89,332,000                                              
        other receivables, less allowance for credit losses of 515 and 522, respectively
      		      135,323,000                                              
        costs and estimated earnings in excess of billings, less allowance for credit losses of 200 and 79, respectively
      		      73,934,000                                              
        billed accounts receivable, less allowance for credit losses of 13,513 and 11,926, respectively
      		       1,708,507,000                                             
        unbilled accounts receivable, less allowance for credit losses of 1,055 and 850, respectively
      		       81,184,000                                             
        other receivables, less allowance for credit losses of 519 and 522, respectively
      		       155,606,000 136,100,000                                            
        costs and estimated earnings in excess of billings, less allowance for credit losses of 227 and 79, respectively
      		       69,391,000                                             
        billed accounts receivable, less allowance for credit losses of 11,949 and 11,926, respectively
      		        1,570,643,000                                            
        unbilled accounts receivable, less allowance for credit losses of 929 and 850, respectively
      		        76,975,000                                            
        costs and estimated earnings in excess of billings, less allowance for credit losses of 108 and 79, respectively
      		        30,118,000                                            
        billed accounts receivable, less allowance for credit losses of 11,926 and 10,640, respectively
      		         1,318,926,000                                           
        unbilled accounts receivable, less allowance for credit losses of 850 and 1,011, respectively
      		         72,774,000                                           
        other receivables, less allowance for credit losses of 522 and 510, respectively
      		         166,319,000                                           
        costs and estimated earnings in excess of billings, less allowance for credit losses of 79 and 80, respectively
      		         28,084,000                                           
        billed accounts receivable, less allowance for credit losses of 10,343 and 10,640, respectively
      		          1,254,798,000                                          
        unbilled accounts receivable, less allowance for credit losses of 1,093 and 1,011, respectively
      		          78,566,000                                          
        other receivables, less allowance for credit losses of 514 and 510, respectively
      		          212,105,000                                          
        costs and estimated earnings in excess of billings, less allowance for credit losses of 94 and 80, respectively
      		          32,554,000                                          
        billed accounts receivable, less allowance for credit losses of 9,972 and 10,640, respectively
      		           1,177,550,000                                         
        unbilled accounts receivable, less allowance for credit losses of 1,103 and 1,011, respectively
      		           82,401,000                                         
        other receivables, less allowance for credit losses of 518 and 510, respectively
      		           59,710,000 41,912,000                                        
        costs and estimated earnings in excess of billings, less allowance for credit losses of 80 and 80, respectively
      		           28,554,000                                         
        billed accounts receivable, less allowance for credit losses of 9,718 and 10,640, respectively
      		            1,176,378,000                                        
        unbilled accounts receivable, less allowance for credit losses of 1,031 and 1,011, respectively
      		            81,151,000                                        
        costs and estimated earnings in excess of billings, less allowance for credit losses of 52 and 80, respectively
      		            26,820,000                                        
        billed accounts receivable, less allowance for credit losses of 10,640 and 8,808, respectively
      		             1,024,082,000                                       
        unbilled accounts receivable, less allowance for credit losses of 1,011 and 715, respectively
      		             77,030,000                                       
        other receivables, less allowance for credit losses of 510 and 503, respectively
      		             38,369,000                                       
        costs and estimated earnings in excess of billings, less allowance for credit losses of 80 and 84, respectively
      		             27,211,000                                       
        billings in excess of costs and estimated earnings
      		             461,781,000 411,942,000 386,258,000 316,478,000 307,380,000 244,578,000 255,357,000 248,397,000 226,237,000 217,454,000 226,047,000 215,106,000 166,918,000 167,097,000 165,289,000 120,290,000 130,986,000 131,152,000 133,962,000 107,939,000 106,005,000 103,049,000 99,536,000 76,834,000 83,985,000 81,408,000 88,116,000 89,647,000 80,433,000 64,807,000 65,949,000 67,733,000 70,942,000 57,150,000 53,440,000 55,981,000 45,769,000 40,015,000 37,104,000 
        deferred revenue
      		             86,512,000                                       
        billed accounts receivable, less allowance for credit losses of 9,903 and 8,808, respectively
      		              1,026,523,000                                      
        unbilled accounts receivable, less allowance for credit losses of 986 and 715, respectively
      		              89,941,000                                      
        other receivables, less allowance for credit losses of 498 and 503, respectively
      		              83,267,000 71,408,000 73,677,000                                    
        costs and estimated earnings in excess of billings, less allowance for credit losses of 67 and 84, respectively
      		              21,700,000                                      
        billed accounts receivable, less allowance for credit losses of 9,996 and 8,808, respectively
      		               942,208,000                                     
        unbilled accounts receivable, less allowance for credit losses of 751 and 715, respectively
      		               79,767,000 70,901,000                                    
        costs and estimated earnings in excess of billings, less allowance for credit losses of 53 and 84, respectively
      		               15,629,000 18,313,000                                    
        billed accounts receivable, less allowance for credit losses of 8,694 and 8,808, respectively
      		                804,832,000                                    
        billed accounts receivable, less allowance for credit losses of 8,808 and 9,087, respectively
      		                 773,716,000                                   
        unbilled accounts receivable, less allowance for credit losses of 715 and 784, respectively
      		                 61,881,000                                   
        other receivables, less allowance for credit losses of 503 and 759, respectively
      		                 57,491,000 30,489,000                                  
        costs and estimated earnings in excess of billings, less allowance for credit losses of 84 and 79, respectively
      		                 29,900,000                                   
        billed accounts receivable, less allowance for credit losses of 7,618 and 9,087, respectively
      		                  700,629,000                                  
        unbilled accounts receivable, less allowance for credit losses of 815 and 784, respectively
      		                  59,473,000 53,624,000 46,834,000                                
        costs and estimated earnings in excess of billings, less allowance for credit losses of 34 and 79, respectively
      		                  14,972,000 12,969,000 10,167,000                                
        billed accounts receivable, less allowance for credit losses of 8,648 and 9,087, respectively
      		                   630,446,000                                 
        other receivables, less allowance for credit losses of 549 and 759, respectively
      		                   38,515,000                                 
        billed accounts receivable, less allowance for credit losses of 7,993 and 9,087, respectively
      		                    585,594,000                                
        other receivables, less allowance for credit losses of 789 and 759, respectively
      		                    38,396,000                                
        billed accounts receivable, less allowance for credit losses of 9,087 and 6,907, respectively
      		                     619,544,000                               
        unbilled accounts receivable, less allowance for credit losses of 784 and 0, respectively
      		                     45,596,000 46,509,000                              
        other receivables, less allowance for credit losses of 759 and 0, respectively
      		                     44,212,000                               
        costs and estimated earnings in excess of billings, less allowance for credit losses of 79 and 0, respectively
      		                     18,622,000 25,382,000 23,515,000                             
        billed accounts receivable, less allowance for credit losses of 9,896 and 6,907, respectively
      		                      608,861,000                              
        other receivables, less allowance for credit losses of 884 and 0, respectively
      		                      36,991,000 20,892,000                             
        billed accounts receivable, less allowance for credit losses of 9,998 and 6,907, respectively
      		                       624,526,000                             
        unbilled accounts receivable, less allowance for credit losses of 684 and 0, respectively
      		                       47,654,000                             
        billed accounts receivable, less allowance for credit losses of 10,337 and 6,907, respectively
      		                        643,748,000                            
        unbilled accounts receivable, less allowance for credit losses of 785 and 0, respectively
      		                        51,058,000                            
        other receivables, less allowance for credit losses of 875 and 0, respectively
      		                        17,908,000                            
        costs and estimated earnings in excess of billings, less allowance for credit losses of 25 and 0, respectively
      		                        7,541,000                            
        billed accounts receivable, less allowance for doubtful accounts of 6,907 and 5,898, respectively
      		                         619,037,000                           
        unbilled accounts receivable
      		                         55,542,000 49,926,000 49,195,000 38,463,000 37,180,000 40,251,000 42,237,000 36,634,000                    
        other receivables
      		                         37,632,000 25,476,000 25,313,000 13,711,000 16,361,000 12,187,000 11,572,000 17,685,000 21,235,000 13,651,000 14,333,000 16,001,000 20,363,000 13,319,000 11,122,000 8,686,000 4,864,000 5,975,000 4,887,000 4,466,000 4,171,000 5,014,000 5,791,000 4,493,000 3,211,000 2,730,000 4,103,000 
        costs and estimated earnings in excess of billings
      		                         2,736,000 6,121,000 8,221,000 8,286,000 10,213,000 11,008,000 7,248,000 2,093,000 30,116,000 39,333,000 40,653,000 35,974,000 29,369,000 36,239,000 33,752,000 17,373,000 26,366,000 22,924,000 23,680,000 25,295,000 28,923,000 25,249,000 22,992,000 26,467,000 26,209,000 25,734,000 25,440,000 
        billed accounts receivable, less allowance for doubtful accounts of 6,526 and 5,898, respectively
      		                          607,061,000                          
        billed accounts receivable, less allowance for doubtful accounts of 5,346 and 5,898, respectively
      		                           587,082,000                         
        billed accounts receivable, less allowance for doubtful accounts of 5,865 and 5,898, respectively
      		                            447,298,000                        
        long-term lease liabilities
      		                            62,028,000                        
        billed accounts receivable, less allowance for doubtful accounts of 5,898 and 3,400, respectively
      		                             481,366,000                       
        billed accounts receivable, less allowance for doubtful accounts of 5,660 and 3,400, respectively
      		                              497,861,000                      
        billed accounts receivable, less allowance for doubtful accounts of 4,202 and 3,400, respectively
      		                               455,596,000                     
        billed accounts receivable, less allowance for doubtful accounts of 3,516 and 3,400, respectively
      		                                392,998,000                    
        accounts receivables
      		                                 382,867,000 390,497,000 391,536,000 297,079,000 318,837,000 331,111,000 335,280,000 228,250,000 254,384,000 236,854,000 234,763,000 245,382,000 229,685,000 206,410,000 197,121,000 206,147,000 199,492,000 178,979,000 174,682,000 
        current maturities of long-term capital lease obligations
      		                                  90,000 112,000 131,000 163,000 190,000 217,000             
        long-term capital lease obligations
      		                                  33,000 45,000 68,000 93,000 123,000 157,000             
        deferred income tax assets
      		                                  27,282,000 29,717,000 28,247,000 27,170,000 29,187,000 28,743,000             
        deferred income tax liabilities
      		                                  2,289,000 2,289,000 2,289,000 2,289,000 1,810,000 1,810,000             
        comfort systems usa, inc. stockholders’ equity
      		                                     376,633,000 364,980,000 352,699,000             
        noncontrolling interests
      		                                                    
        assets related to discontinued operations
      		                                        438,000 7,000 7,000 221,000 741,000 992,000 469,000 506,000 872,000    
        property, plant and equipment
      		                                        34,083,000            
        marketable securities
      		                                        5,590,000            
        current maturities of notes to former owners
      		                                        2,018,000            
        income taxes payable
      		                                         3,202,000  734,000   1,051,000 7,615,000 2,132,000 2,657,000 471,000 3,700,000 
        accrued self-insurance expense
      		                                        26,925,000            
        liabilities related to discontinued operations
      		                                         370,000 376,000 450,000 440,000 678,000 62,000 63,000 38,000    
        notes to former owners, net of current maturities
      		                                        6,607,000            
        accumulated other comprehensive income
      		                                        -217,000            
        accrued self insurance expense
      		                                         19,251,000 20,232,000 19,618,000 19,422,000 19,093,000 17,882,000 17,388,000 18,645,000    
        deferred compensation
      		                                                -1,266,000 -1,279,000   
        receivable from sale of operations
      		                                           142,000    23,800,000     
        stock warrant and related put obligation
      		                                                    
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 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 2009-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 
                                                          
          cash flows from operating activities:
        		                                                  
          net income
        		370,378,000 330,806,000 291,615,000 230,848,000 169,289,000 145,870,000 146,235,000 134,009,000 96,319,000 91,581,000 105,125,000 69,476,000 57,216,000 55,424,000 61,515,000 42,246,000 86,762,000 37,595,000 46,297,000 32,965,000 26,491,000 42,840,000 50,088,000 39,495,000 17,716,000 34,052,000 36,233,000 24,173,000 19,866,000 25,156,000 38,541,000 32,547,000 16,659,000  22,284,000 17,972,000 7,477,000   -961,000 8,695,000 1,806,000 19,762,000 1,041,000 3,594,000 4,327,000 -12,357,000 1,453,000 4,149,000 529,000 
          adjustments to reconcile net income to net cash from operating activities—
        		                                                  
          amortization of identifiable intangible assets
        		20,394,000 20,148,000 19,526,000 19,791,000 20,115,000 22,042,000 24,421,000 26,890,000 23,913,000 11,131,000 10,929,000 11,013,000 10,331,000 11,193,000 11,444,000 12,367,000 12,791,000 11,571,000 11,185,000 8,824,000 8,925,000 7,392,000 8,165,000 10,911,000 6,230,000 6,861,000 7,215,000 8,115,000 4,891,000 5,987,000 5,349,000 4,926,000 3,827,000 4,782,000 5,320,000 5,740,000 1,562,000 1,958,000 2,037,000            
          depreciation expense
        		18,566,000 17,465,000 16,048,000 14,856,000 14,010,000 12,842,000 12,333,000 11,790,000 11,254,000 10,445,000 9,457,000 9,073,000 9,187,000 8,909,000 8,348,000 8,249,000 8,046,000 7,373,000 7,141,000 6,874,000 7,051,000 7,113,000 7,185,000 7,172,000 6,461,000 6,268,000 6,209,000 6,180,000 5,833,000 5,970,000 5,661,000 5,556,000 5,413,000 5,338,000 5,117,000 5,020,000 4,577,000 4,537,000 4,476,000         154,000 88,000 1,065,000 
          change in right-of-use assets
        		12,668,000 11,313,000 7,567,000 7,310,000 7,658,000 8,550,000 8,077,000 6,342,000 7,981,000 6,334,000 8,746,000 5,527,000 5,357,000 5,684,000 5,429,000 5,710,000 4,734,000 4,688,000 4,350,000 4,177,000 4,377,000 4,354,000 3,651,000 505,000 8,182,000 6,335,000                         
          bad debt expense
        		838,000 992,000 1,929,000 2,308,000 1,380,000 1,488,000 2,773,000 2,335,000 356,000 2,095,000 822,000 1,081,000 946,000 1,199,000 355,000 1,091,000 25,000 246,000 -1,269,000 589,000 -1,018,000 -65,000 725,000 42,000 4,551,000 885,000 1,309,000 549,000 235,000 657,000 1,719,000 925,000 261,000 153,000 91,000 -281,000 219,000 150,000 120,000 -2,000 -352,000 821,000 388,000 150,000 74,000 74,000 1,493,000 -667,000   
          deferred tax provision
        		956,000 -12,814,000 6,440,000 -935,000 2,032,000 -34,102,000   -14,205,000 -21,059,000 171,655,000 -27,763,000 -27,537,000 -106,083,000 5,267,000 3,983,000 2,328,000 313,000 1,140,000 5,859,000 -410,000 -9,150,000 4,177,000 -3,280,000 300,000 -1,631,000 -3,078,000 309,000 149,000 -1,064,000 -2,880,000 -248,000 8,648,000                  
          amortization of debt financing costs
        		232,000 232,000 446,000 171,000 169,000 173,000 172,000 171,000 171,000 173,000 172,000 171,000 169,000 173,000 172,000 308,000 133,000 135,000 136,000 134,000 133,000 136,000 138,000 135,000 135,000 100,000 96,000 95,000 96,000 95,000 96,000 98,000 94,000 94,000 94,000 94,000 94,000 94,000 94,000 0 1,000 26,000 74,000 0 0 25,000 271,000 -102,000 6,000 120,000 
          gain on sale of assets
        		-302,000 -394,000 -582,000 -442,000 -556,000 -252,000 -1,347,000 -611,000 -820,000 -619,000 -579,000 -592,000 -512,000 -473,000 -406,000 -383,000 -323,000 -519,000 -180,000 -491,000 -350,000 -202,000 -377,000 -312,000 -554,000 -582,000 -708,000 -192,000 -219,000 -315,000 -219,000 -200,000 -211,000 -206,000 -184,000 -126,000 -154,000 -238,000 -166,000            
          changes in the fair value of contingent earn-out obligations
        		10,370,000 13,539,000 12,103,000 4,073,000 3,758,000 43,712,000 17,254,000 14,689,000 12,491,000 9,400,000 8,727,000 3,098,000 2,382,000 5,349,000 3,443,000 115,000 -4,088,000 -3,297,000 1,244,000 -4,581,000 -1,186,000 -7,295,000 -3,423,000 3,871,000 -2,272,000 -933,000 2,004,000 1,762,000 158,000 2,559,000 -434,000 94,000 -153,000 -1,870,000 -2,469,000 598,000 26,000 -263,000 -804,000            
          stock-based compensation
        		19,406,000 6,063,000 3,553,000 4,156,000 8,037,000 4,517,000 2,044,000 2,671,000 7,414,000 3,811,000 880,000 2,107,000 6,141,000 3,053,000 1,049,000 2,434,000 3,996,000 3,215,000 518,000 2,149,000 4,711,000 985,000 761,000 1,557,000 3,631,000 1,017,000 182,000 1,503,000 3,176,000 1,140,000 1,147,000 2,081,000 2,793,000 2,060,000 870,000 2,114,000 1,333,000 1,173,000 519,000            
          changes in operating assets and liabilities, net of effects of acquisitions and divestitures—
        		                                                  
          decrease in—
        		                                                  
          receivables
        		-214,734,000 -215,654,000 -138,964,000 -287,945,000 48,265,000 -70,275,000 4,131,000 -141,507,000 -125,582,000 -5,273,000 -228,556,000 -21,789,000 -125,937,000 52,670,000 -95,977,000 -127,170,000 -52,701,000 -32,237,000 -18,968,000 -56,525,000 49,684,000 5,182,000 3,046,000 38,152,000 -7,894,000 -17,861,000 -18,566,000 -51,353,000 38,272,000 12,105,000 -25,051,000 -52,133,000 -3,542,000 252,000 835,000 -63,411,000 24,525,000 11,339,000 2,383,000   1,561,000        1,305,000 
          inventories
        		-9,881,000 -4,893,000 -8,098,000 -7,599,000 -3,821,000 -3,544,000 8,098,000 7,283,000 -5,293,000 -11,416,000 -12,280,000 -4,606,000 -1,386,000 2,840,000 -6,903,000 -6,328,000 -3,104,000 597,000 -883,000 -3,184,000 -2,181,000 -749,000 -488,000 36,000 -256,000 2,614,000 -51,000 295,000 -492,000 379,000 -482,000 -898,000 -537,000 475,000 -135,000 -174,000 -750,000 511,000 234,000 421,000       1,083,000 174,000 193,000 103,000 
          prepaid expenses and other current assets
        		-15,666,000 -78,131,000 -17,045,000 5,861,000 -2,044,000 -23,042,000 450,000 19,223,000 -4,499,000 -13,641,000 5,927,000 -2,512,000 -911,000 -27,751,000 674,000 3,642,000 -2,803,000 -24,215,000 2,555,000 13,427,000 -390,000 -14,272,000 -3,965,000 7,990,000 5,392,000 -10,894,000 -3,890,000 1,348,000 -2,083,000 -2,566,000 -1,464,000 1,161,000 3,388,000 3,075,000 -4,651,000 3,384,000 659,000 -5,202,000 -1,999,000 -2,873,000    -3,071,000      970,000 
          costs and estimated earnings in excess of billings and unbilled accounts receivable
        		-52,575,000 99,674,000 43,948,000 -13,467,000 -150,100,000 -23,608,000 -13,045,000 -40,606,000 -4,822,000 12,676,000 -161,000 -2,884,000 -2,281,000 7,537,000 -15,996,000 -3,746,000 2,562,000 -8,573,000 -5,946,000 -9,592,000 6,840,000 9,713,000 -822,000 -5,490,000 -695,000 -2,231,000 989,000 -3,741,000 671,000 3,884,000 383,000 -10,646,000 -8,065,000                  
          other noncurrent assets
        		-597,000 181,000 -702,000 111,000 24,000 -338,000 -566,000 -1,036,000 -280,000 95,000 741,000 -690,000 -298,000 -909,000 -109,000 -158,000 181,000 74,000 -143,000 -821,000 -284,000 -742,000 -403,000 -453,000 225,000 -191,000 -7,419,000 3,814,000 3,061,000 85,000 -260,000 -235,000 296,000 92,000 493,000 -45,000 465,000 -15,000 -44,000   202,000 758,000 -367,000 -81,000 117,000    112,000 
          increase in—
        		                                                  
          accounts payable and other current liabilities
        		4,879,000 -81,336,000 125,415,000 -7,631,000 -312,499,000                                              
          billings in excess of costs and estimated earnings and deferred revenue
        		225,017,000 345,338,000 187,966,000 273,717,000 103,063,000 -48,275,000 47,636,000 9,505,000 23,307,000 132,018,000 78,931,000 -20,923,000 159,140,000                                      
          other long-term liabilities
        		-1,121,000 16,011,000 2,106,000 7,312,000 3,270,000 -4,427,000 -2,160,000 -2,310,000 95,000 -5,828,000 2,619,000 -21,000 6,250,000 -3,754,000 -3,456,000 -2,652,000 -5,755,000 -2,724,000 -3,415,000 -3,465,000 -5,209,000 -8,192,000 6,795,000 10,975,000 -8,770,000 -5,728,000 -4,302,000 -2,169,000 -2,552,000 -2,322,000 5,460,000 382,000 -9,064,000 10,678,000 332,000 181,000 47,000 601,000 452,000            
          net cash from operating activities
        		388,828,000 468,540,000 553,271,000 252,495,000 -87,950,000 210,463,000 302,179,000 189,858,000 146,557,000 173,008,000 214,241,000 125,410,000 126,909,000 132,007,000 61,232,000 44,563,000 63,729,000 27,497,000 42,585,000 25,422,000 84,647,000 70,110,000 52,614,000 141,866,000 21,920,000 42,313,000 73,115,000 25,609,000 991,000 79,188,000 30,484,000 33,667,000 3,851,000 48,398,000 44,512,000 11,127,000 10,053,000 41,434,000 13,333,000 3,579,000   12,178,000 -3,030,000   29,343,000 -3,826,000   
          capital expenditures
        		-147,473,000 -66,090,000 -35,332,000 -31,273,000 -22,208,000 -40,676,000 -22,059,000 -23,384,000 -24,952,000 -25,264,000 -28,444,000 -24,610,000 -16,520,000 -13,566,000 -14,578,000 -11,023,000 -9,192,000 -6,466,000 -5,102,000 -5,950,000 -4,812,000 -4,672,000 -4,920,000 -7,042,000 -7,497,000 -9,109,000 -6,961,000 -6,836,000 -8,844,000 -5,209,000 -7,936,000 -8,535,000 -5,588,000 -18,637,000 -5,184,000 -6,569,000 -5,077,000 -5,960,000 -6,353,000 0   0 0   0 0   
          free cash flows
        		241,355,000 402,450,000 517,939,000 221,222,000 -110,158,000 169,787,000 280,120,000 166,474,000 121,605,000 147,744,000 185,797,000 100,800,000 110,389,000 118,441,000 46,654,000 33,540,000 54,537,000 21,031,000 37,483,000 19,472,000 79,835,000 65,438,000 47,694,000 134,824,000 14,423,000 33,204,000 66,154,000 18,773,000 -7,853,000 73,979,000 22,548,000 25,132,000 -1,737,000 29,761,000 39,328,000 4,558,000 4,976,000 35,474,000 6,980,000 3,579,000   12,178,000 -3,030,000   29,343,000 -3,826,000   
          cash flows from investing activities:
        		                                                  
          purchases of property and equipment
        		-147,473,000 -66,090,000 -35,332,000 -31,273,000 -22,208,000 -40,676,000 -22,059,000 -23,384,000 -24,952,000 -25,264,000 -28,444,000 -24,610,000 -16,520,000 -13,566,000 -14,578,000 -11,023,000 -9,192,000 -6,466,000 -5,102,000 -5,950,000 -4,812,000 -4,672,000 -4,920,000 -7,042,000 -7,497,000 -9,109,000 -6,961,000 -6,836,000 -8,844,000 -5,209,000 -7,936,000 -8,535,000 -5,588,000 -18,637,000 -5,184,000 -6,569,000 -5,077,000 -5,960,000 -6,353,000            
          proceeds from sales of property and equipment
        		874,000 543,000 1,088,000 969,000 1,095,000 1,927,000 1,782,000 815,000 1,014,000 858,000 3,007,000 1,464,000 622,000 707,000 592,000 503,000 1,056,000 1,299,000 272,000 1,032,000 498,000 380,000 512,000 688,000 690,000 712,000 815,000 275,000 357,000 621,000 416,000 295,000 366,000 575,000 179,000 313,000 292,000 215,000 353,000 244,000 41,000 41,000 328,000 -21,000 61,000 109,000 343,000 290,000 -85,000 148,000 
          cash paid for acquisitions, net of cash acquired
        		-6,097,000 -151,016,000 -4,501,000 -55,681,000 -68,412,000 0 -809,000 -37,987,000 -196,670,000 -48,857,000 0 -357,000 -53,047,000 -710,000 -9,134,000 -39,376,000 3,000 -121,950,000 -93,801,000 -1,026,000 -10,716,000 -72,996,000 -10,947,000 -93,269,000 -8,729,000 0 -172,000 -194,985,000 -1,313,000 -4,853,000 -51,619,000 -6,949,000 -6,719,000 0 -11,150,000 -83,397,000 -313,000 1,347,000 -20,000            
          payments for investments
        		-45,071,000 -35,202,000 -21,521,000 -220,000 -7,258,000 -740,000 -500,000 -230,000 -1,040,000 -620,000 -60,000   -850,000 -374,000 0 -1,236,000                                  
          proceeds from investments
        		13,766,000 20,489,000                                                 
          net cash from investing activities
        		-184,001,000 -231,276,000 -53,008,000 -86,205,000 -96,783,000 -39,489,000 -21,586,000 -60,786,000 -221,648,000 -73,883,000 -25,497,000 -24,683,000 -68,945,000 -14,419,000 -23,494,000 -49,896,000 -9,369,000 -127,117,000 -98,631,000 -5,944,000 -15,030,000 -77,288,000 -15,355,000 -99,623,000 -15,536,000 -8,397,000 -4,707,000 -201,546,000 -9,800,000 -9,441,000 -59,139,000 -15,189,000 -11,941,000 -18,062,000 -16,155,000 -89,653,000 -5,098,000 -4,398,000 -6,020,000    20,301,000        
          cash flows from financing activities:
        		                                                  
          payments on revolving credit facility
        		-100,000,000 0    0 0 -20,000,000 -162,000,000 0 -140,000,000 -220,000,000 -140,000,000 -180,000,000 -35,000,000 -335,000,000 -10,000,000 -10,000,000 -35,000,000 -10,000,000 -70,000,000 -61,500,000 -13,500,000                            
          payments on other debt
        		-6,147,000 -22,000 -37,022,000 -22,000 -5,993,000 -26,000 -22,702,000 -3,826,000 -22,000 -10,053,000 -14,000 -1,950,000 -16,000 -4,422,000 -13,000 -24,000 -7,797,000 -6,696,000 -235,000   -2,070,000 -12,015,000 -19,632,000 -12,817,000 -530,000 -33,000 -2,191,000 -1,030,000 -33,000 -25,000 -523,000 -546,000 -37,000 -511,000 -262,000 -25,000 -25,000 -525,000            
          payments of dividends to stockholders
        		-24,623,000 -21,159,000 -17,641,000 -15,871,000 -14,162,000 -12,444,000 -10,688,000 -10,713,000 -8,921,000 -8,924,000 -8,049,000 -7,152,000 -6,254,000 -5,365,000 -5,013,000 -5,026,000 -4,673,000 -4,693,000 -4,350,000 -4,178,000 -4,163,000 -3,992,000 -3,833,000 -3,830,000 -3,844,000 -3,672,000 -3,673,000 -3,692,000 -3,506,000 -3,338,000 -3,170,000 -2,974,000 -2,786,000 -2,788,000 -2,794,000 -2,797,000 -2,608,000 -2,601,000 -2,619,000            
          share repurchases
        		-2,548,000 -91,573,000 -13,136,000 -19,921,000 -91,369,000 -15,888,000                                             
          shares received in lieu of tax withholding
        		-3,125,000 -3,135,000 -282,000 -3,977,000 -2,622,000 -1,623,000 -104,000 -5,062,000 -2,126,000 0 -36,000 -2,891,000 -1,798,000 0 0 -1,848,000 -1,399,000 0 0 -1,509,000 -854,000 0 0 -454,000 -622,000 0 0 -717,000 -781,000 0 0 -694,000 -846,000 0 0 -787,000 -632,000 0 0            
          proceeds from exercise of options
        		383,000 0 340,000   157,000 0 0 27,000 0 0 0 18,000 142,000    2,185,000 0 2,044,000 1,405,000 589,000 999,000   1,349,000 181,000 20,000 800,000 206,000 740,000 1,921,000 238,000 756,000 0 560,000 736,000 845,000 0 -190,000 558,000 205,000 2,246,000 -918,000 41,000 1,056,000 1,796,000 471,000 -277,000 571,000 
          payments for contingent consideration arrangements
        		-501,000 0 0 0 -46,302,000 -6,794,000 0 0 -18,570,000 0 -1,242,000   0 -3,152,000 -55,000 -1,752,000 0 -2,616,000   0 0 0 -9,865,000 0 -750,000 0 -593,000 -3,250,000 -150,000   0    0 0            
          net cash from financing activities
        		-136,561,000 -115,889,000 28,550,000 -39,338,000 -160,448,000 -36,618,000 -64,429,000 -30,445,000 -29,267,000 -31,598,000 -111,128,000 -89,280,000 -66,618,000 -131,513,000 -35,728,000 -41,153,000 2,479,000 90,675,000 70,108,000 -17,935,000 -72,397,000 -8,466,000 -19,970,000 -122,256,000 76,092,000 -23,491,000 -64,832,000 183,594,000 -7,681,000 -43,375,000 19,902,000 -15,696,000 -3,233,000 -23,290,000 -33,326,000 81,547,000 -5,585,000 -30,299,000 -20,258,000     -2,138,000 368,000 621,000     
          net increase in cash and cash equivalents
        		68,266,000 121,375,000    134,356,000 216,164,000   67,527,000 77,616,000 11,447,000 -8,654,000 -13,925,000 2,010,000 -46,486,000 56,839,000 -8,945,000 14,062,000 1,543,000 -2,780,000 -15,644,000 17,287,000 -80,011,000 82,476,000         7,046,000 -4,969,000 3,021,000 -630,000 6,737,000 -12,945,000 554,000   32,866,000    15,763,000 3,253,000   
          cash and cash equivalents, beginning of period
        		981,898,000 0 0 0 549,939,000 0 0 0 205,150,000 0 0 0 57,214,000 0 0 0 58,776,000 0 0 0 54,896,000 0 0 0 50,788,000 0 0 0 45,620,000  0 0 36,542,000  0 0 32,074,000  0            
          cash and cash equivalents, end of period
        		1,050,164,000 121,375,000 528,813,000 126,952,000 204,758,000 134,356,000 216,164,000 98,627,000 100,792,000 67,527,000 77,616,000 11,447,000 48,560,000 -13,925,000 2,010,000 -46,486,000 115,615,000 -8,945,000 14,062,000 1,543,000 52,116,000 -15,644,000 17,287,000 -80,011,000 133,264,000 10,425,000 3,576,000 7,657,000 29,130,000  -8,753,000 2,782,000 25,219,000  -4,969,000 3,021,000 31,444,000  -12,945,000            
          proceeds from revolving credit facility
        		 0    0 0 20,000,000 162,000,000 0 40,000,000 160,000,000 85,000,000 60,000,000 10,000,000 435,000,000 50,000,000 115,000,000 135,000,000 15,000,000 10,000,000 70,000,000 20,000,000                            
          proceeds from other debt
        		     0 0 0 640,000                                          
          debt financing costs
        		 0            0 0               0 0       0 0            
          deferred acquisition payments
        		     0        0 0 0 -50,000 0 0 0 -400,000 -150,000 -100,000 0 -400,000 0 -137,000 -250,000 -250,000 0    0 0 -2,000,000 -802,000              
          net decrease in cash and cash equivalents
        		   126,952,000 -345,181,000    -104,358,000                  3,576,000 7,657,000 -16,490,000    -11,323,000                  
          payments on term loan
        		             0 0 -112,500,000 -7,500,000 0 0 -7,500,000 -7,500,000 0 -3,750,000                            
          payments on finance lease liabilities
        		             -79,000 79,000 -646,000 -253,000 -3,598,000                                 
          accounts payable and accrued liabilities
        		      45,795,000 159,204,000 118,757,000 -48,915,000 51,086,000 105,644,000 28,652,000 67,107,000 60,699,000 36,183,000 1,899,000 -11,108,000 26,076,000 22,123,000 -33,087,000 27,117,000 -14,046,000 43,815,000 -45,799,000 24,411,000 44,484,000 21,482,000 -59,331,000 28,334,000 10,067,000 25,133,000 -15,663,000 -527,000 9,173,000 29,721,000 -16,299,000 1,108,000 -4,801,000 -16,227,000   4,266,000 873,000   12,620,000 -21,004,000   
          deferred tax benefit
        		                                  2,435,000                
          share repurchase
        		       -10,844,000 -295,000 -12,621,000 -1,787,000 -3,208,000 -3,568,000 -1,789,000 -3,573,000 -18,757,000 -14,097,000 -1,523,000 -22,484,000 -2,162,000 -885,000 -11,343,000 -7,771,000 -2,021,000 -8,985,000 -4,233,000 -7,420,000 -4,576,000 -3,321,000 -16,960,000 -4,743,000 -2,537,000 -4,293,000 -98,000 -5,093,000 -1,619,000 -2,197,000 -2,111,000 -6,053,000            
          billings in excess of costs and estimated earnings
        		             49,839,000 25,684,000 68,672,000 9,046,000 44,363,000 -27,253,000 6,960,000 20,550,000 5,945,000 -8,593,000 -13,255,000 35,337,000 -179,000 1,856,000 13,439,000 -10,740,000 -896,000 -7,149,000 25,124,000 -293,000 2,956,000 3,474,000 13,986,000 -7,151,000 2,577,000 -6,708,000 -26,190,000   15,718,000 -17,001,000 10,082,000 3,710,000 9,074,000 4,477,000 3,080,000 2,737,000 
          proceeds from sale of business
        		                         0                         
          effect of exchange rate changes on cash and cash equivalents
        		                                                  
          proceeds from senior credit facility
        		                        150,000,000                          
          payments on senior credit facility
        		                        -37,375,000                          
          goodwill impairment
        		                                 0 0 0 1,105,000              
          proceeds from revolving line of credit
        		                         36,000,000 13,000,000 253,000,000 54,000,000 20,000,000 70,000,000 14,000,000 20,000,000 37,000,000 30,000,000   0 6,000,000            
          payments on revolving line of credit
        		                         -51,000,000 -66,000,000 -58,000,000 -53,000,000 -40,000,000 -42,000,000 -22,000,000 -15,000,000 -58,000,000 -52,500,000   -25,000,000 -17,000,000            
          payments on capital lease obligations
        		                                 -123,000 -28,000 -48,000 -57,000 -57,000 -61,000            
          cash and cash equivalents, beginning of year
        		                                                  
          cash and cash equivalents, end of year
        		                                                  
          net income including noncontrolling interests
        		                                     16,867,000 20,471,000            
          costs and estimated earnings in excess of billings
        		                                 9,217,000 1,433,000 -2,176,000 -6,605,000 6,870,000 -2,487,000   950,000     2,679,000   862,000 
          excess tax benefit of stock-based compensation
        		                                                  
          distributions to noncontrolling interests
        		                                                  
          deferred tax expense
        		                                    -1,077,000 -633,000 -444,000  -570,000 916,000  -1,174,000 -292,000 788,000 3,040,000 -542,000 569,000 269,000 
          cash flows from operating activities
        		                                                  
          adjustments to reconcile net income to net cash from operating activities ―
        		                                                  
          estimated loss on disposition of discontinued operations
        		                                                  
          deferred tax (benefit) expense
        		                                                  
          stock-based compensation expense
        		                                       -290,000 283,000 488,000 1,358,000 -242,000 320,000 326,000     
          changes in operating assets and liabilities, net of effects of acquisitions —
        		                                                  
          increase in —
        		                                                  
          purchases of property, plant and equipment
        		                                                  
          proceeds from businesses sold
        		                                                  
          sale of marketable securities
        		                                                  
          purchases of marketable securities
        		                                                  
          cash paid for acquisitions and intangible assets, net of cash acquired
        		                                                  
          net borrowings on revolving line of credit
        		                                                  
          payments on other long-term debt
        		                                                  
          payments of dividends to shareholders
        		                                                  
          share repurchase program and shares received in lieu of tax withholding
        		                                                  
          cash and cash equivalents, beginning of period – continuing and discontinued operations
        		                                                  
          cash and cash equivalents, end of period– continuing and discontinued operations
        		                                                  
          estimated gain on disposition of discontinued operations
        		                                                  
          depreciation and amortization expense
        		                                        135,000 1,544,000 3,931,000 22,000 55,000 1,258,000     
          taxes paid related to the sale of businesses
        		                                                  
          proceeds from businesses sold, net of cash sold and transaction costs
        		                                        -26,000 32,000 25,646,000 -888,000 -23,616,000 24,595,000 1,123,000 -375,000 713,000 205,000 
          cash paid for acquisition and intangible assets, net of cash acquired
        		                                                  
          payments on debt acquired
        		                                                  
          tax benefit of stock-based compensation
        		                                        435,000 237,000         
          cash and cash equivalents, beginning of year—continuing operations and discontinued operations
        		                                        -21,248,000 90,286,000         
          cash and cash equivalents, end of year—continuing operations and discontinued operations
        		                                        18,894,000 69,038,000         
          adjustments to reconcile net income to net cash from operating activities
        		                                                  
          write-off of debt costs
        		                                                  
          tax benefit of stock-based compensation expense
        		                                                  
          mark-to-market warrant obligation
        		                                                  
          changes in operating assets and liabilities, net of effects of acquisitions and divestitures— increase in—
        		                                                  
          other
        		                                                  
          cash paid for acquisition and intangible assets, including cash acquired
        		                                                  
          borrowings of other long-term debt
        		                                                  
          cash from operating activities:
        		                                                  
          estimated (gain) loss on disposition of discontinued operations
        		                                                  
          write off of debt costs
        		                                                  
          gain on sale of assets or operations
        		                                                  
          cash and cash equivalents, beginning of period—continuing operations and discontinued operations
        		                                           8,730,000 2,768,000 55,593,000  4,001,000 -10,122,000 32,576,000 
          cash and cash equivalents, end of period—continuing operations and discontinued operations
        		                                           1,827,000 8,730,000 58,361,000  7,254,000 4,001,000 22,454,000 
          (increase) decrease in—
        		                                                  
          increase (decrease) in—
        		                                                  
          cash paid for acquisition, including cash acquired
        		                                                  
          net increase (decrease) in cash and cash equivalents
        		                                            5,962,000 2,768,000     
          tax benefit from exercise of options
        		                                              1,047,000 61,000 -189,000 348,000 
          increase in— accounts payable and accrued liabilities
        		                                                  
          net cash from (used in) investing activities
        		                                             22,655,000     
          restructuring charges
        		                                                  
          write-off of debt costs and discount
        		                                                  
          loss on sale of assets
        		                                                  
          deferred compensation expense
        		                                              350,000 164,000 -182,000 187,000 
          amortization of debt discount
        		                                                  
          changes in operating assets and liabilities, net of effects of acquisitions and divestitures— decrease in—
        		                                                  
          cash paid for acquisition, including cash acquired­
        		                                                  
          net payments on revolving line of credit
        		                                                  
          loss on sale of assets or operations
        		                                                  
          adjustments to reconcile net income to net cash used in operating activities—
        		                                                  
          net cash from (used in) financing activities
        		                                                 52,000 
          cumulative effect of change in accounting principle
        		                                                  
          extinguishment of subordinated notes
        		                                                  
          loss (gain) on sale of assets