7Baggers

TriNet Group, Inc
(NYSE:TNET) 

TNET stock logo

TriNet Group, Inc. provides human resources (HR) solutions for small and midsize businesses in the United States. The company offers multi-state payroll processing and tax administration; employee benefits programs, including health insurance and retirement plans; workers compensation insurance and ...

Founded: 1988
Full Time Employees: 2,800
Sector: Industrials
Industry: Staffing & Employment Services

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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 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 
                                                     
      professional service revenues
    189,000,000 169,000,000 169,000,000 172,000,000 209,000,000 181,000,000 184,000,000 186,000,000 214,000,000 189,000,000 185,000,000 177,000,000 205,000,000 189,000,000 189,000,000 182,000,000 194,000,000 174,000,000 156,000,000 156,000,000 153,000,000 141,000,000 126,000,000 121,000,000 156,000,000 137,000,000 130,000,000 127,000,000 136,000,000 124,000,000 119,000,000 115,000,000 129,000,000 116,707,000 112,530,000 108,642,000 120,121,000 114,266,000 110,493,000 109,593,000 112,403,000 106,999,000 99,473,000 97,799,000 97,016,000 90,075,000 86,864,000 82,260,000 82,875,000 
      insurance service revenues
    1,023,000,000 1,065,000,000 1,046,000,000 1,048,000,000 1,065,000,000 1,081,000,000 1,053,000,000 1,040,000,000 1,050,000,000 1,056,000,000 1,037,000,000 1,032,000,000 1,041,000,000 1,037,000,000 1,052,000,000 1,018,000,000 1,024,000,000 1,058,000,000 992,000,000 944,000,000 907,000,000 922,000,000 849,000,000 827,000,000 892,000,000 881,000,000 839,000,000 808,000,000 798,000,000 793,000,000 756,000,000 735,000,000 732,000,000 730,849,000 706,763,000 691,899,000 687,489,000 696,805,000 659,964,000 636,253,000 620,536,000 618,696,000 568,535,000 542,208,000 528,562,000 513,587,000 469,087,000 442,746,000 426,037,000 
      interest income
    14,000,000 14,000,000 17,000,000 18,000,000 18,000,000 15,000,000 15,000,000 17,000,000 18,000,000 15,000,000 18,000,000 20,000,000 18,000,000 14,000,000 5,000,000 2,000,000 1,000,000  3,000,000 1,000,000 2,000,000 1,000,000 2,000,000 2,000,000 5,000,000 5,000,000 5,000,000 7,000,000 6,000,000                     
      total revenues
    1,226,000,000 1,248,000,000 1,232,000,000 1,238,000,000 1,292,000,000 1,326,000,000 1,237,000,000 1,226,000,000 1,264,000,000 1,245,000,000 1,222,000,000 1,209,000,000 1,246,000,000 1,226,000,000 1,241,000,000 1,200,000,000 1,218,000,000 1,232,000,000 1,148,000,000 1,100,000,000 1,060,000,000 1,063,000,000 975,000,000 948,000,000 1,048,000,000 1,018,000,000 969,000,000 935,000,000 934,000,000 917,000,000 875,000,000 850,000,000 861,000,000 847,556,000 819,293,000 800,541,000 807,610,000 811,071,000 770,457,000 745,846,000 732,939,000 725,695,000 668,008,000 640,007,000 625,578,000 603,662,000 555,951,000 525,006,000 508,912,000 
      yoy
    -5.11% -5.88% -0.40% 0.98% 2.22% 6.51% 1.23% 1.41% 1.44% 1.55% -1.53% 0.75% 2.30% -0.49% 8.10% 9.09% 14.91% 15.90% 17.74% 16.03% 1.15% 4.42% 0.62% 1.39% 12.21% 11.01% 10.74% 10.00% 8.48% 8.19% 6.80% 6.18% 6.61% 4.50% 6.34% 7.33% 10.19% 11.76% 15.34% 16.54% 17.16% 20.22% 20.16% 21.90% 22.92%     
      qoq
    -1.76% 1.30% -0.48% -4.18% -2.56% 7.19% 0.90% -3.01% 1.53% 1.88% 1.08% -2.97% 1.63% -1.21% 3.42% -1.48% -1.14% 7.32% 4.36% 3.77% -0.28% 9.03% 2.85% -9.54% 2.95% 5.06% 3.64% 0.11% 1.85% 4.80% 2.94% -1.28% 1.59% 3.45% 2.34% -0.88% -0.43% 5.27% 3.30% 1.76% 1.00% 8.64% 4.38% 2.31% 3.63% 8.58% 5.89% 3.16%  
      insurance costs
    856,000,000 1,003,000,000 943,000,000 947,000,000 942,000,000 1,025,000,000 949,000,000 916,000,000 907,000,000 919,000,000 874,000,000 868,000,000 852,000,000 916,000,000 872,000,000 852,000,000 823,000,000 939,000,000 851,000,000 798,000,000 751,000,000 842,000,000 759,000,000 613,000,000 765,000,000 792,000,000 748,000,000 704,000,000 683,000,000 692,000,000 647,000,000 630,000,000 641,000,000 644,426,000 613,397,000 599,535,000 608,642,000 637,968,000 609,422,000 596,673,000 569,689,000 576,698,000 534,481,000 517,994,000 483,203,000 476,779,000 428,184,000 400,195,000 381,157,000 
      cost of providing services
    70,000,000 74,000,000 73,000,000 71,000,000 71,000,000 76,000,000 74,000,000 75,000,000 79,000,000 76,000,000 74,000,000 79,000,000 78,000,000 78,000,000 79,000,000 76,000,000 70,000,000 73,000,000 61,000,000 66,000,000 64,000,000 70,000,000 68,000,000 60,000,000 64,000,000 59,000,000 59,000,000 63,000,000 64,000,000 63,000,000 58,000,000 51,000,000 57,000,000 55,736,000 49,989,000 50,825,000 56,450,000 50,563,000 50,142,000 44,034,000 45,705,000 39,112,000 37,540,000 37,672,000 36,370,000 34,004,000 32,575,000 34,034,000 33,643,000 
      sales and marketing
    69,000,000 66,000,000 68,000,000 68,000,000 67,000,000 71,000,000 74,000,000 72,000,000 72,000,000 71,000,000 75,000,000 70,000,000 69,000,000 63,000,000 72,000,000 62,000,000 45,000,000 55,000,000 56,000,000 45,000,000 46,000,000 50,000,000 45,000,000 45,000,000 46,000,000 45,000,000 47,000,000 52,000,000 46,000,000 50,000,000 52,000,000 41,000,000 39,000,000 47,462,000 44,407,000 45,940,000 49,191,000 39,736,000 41,470,000 43,800,000 48,708,000 43,019,000 44,997,000 41,119,000 37,624,000 35,772,000 37,396,000 34,992,000 31,837,000 
      general and administrative
    59,000,000 58,000,000 51,000,000 52,000,000 46,000,000 92,000,000 46,000,000 47,000,000 48,000,000 57,000,000 51,000,000 60,000,000 43,000,000 76,000,000 63,000,000 55,000,000 47,000,000 48,000,000 52,000,000 40,000,000 36,000,000 46,000,000 38,000,000 35,000,000 33,000,000 38,000,000 27,000,000 36,000,000 36,000,000 47,000,000 33,000,000 31,000,000 31,000,000 31,969,000 28,505,000 28,224,000 25,302,000 22,581,000 22,477,000 18,951,000 27,650,000 20,635,000 17,726,000 15,801,000 15,464,000 13,141,000 13,766,000 12,682,000 14,337,000 
      systems development and programming
    19,000,000 16,000,000 18,000,000 17,000,000 20,000,000 16,000,000 17,000,000 17,000,000 18,000,000 16,000,000 15,000,000 17,000,000 17,000,000 19,000,000 18,000,000 20,000,000 16,000,000 14,000,000 12,000,000 11,000,000 13,000,000 13,000,000 9,000,000 9,000,000 9,000,000 9,000,000 9,000,000 13,000,000 12,000,000 13,000,000 12,000,000 11,000,000 13,000,000 11,363,000 11,182,000 11,415,000 11,040,000             
      depreciation and amortization of intangible assets
    17,000,000 16,000,000 16,000,000 17,000,000 17,000,000 19,000,000 19,000,000 19,000,000 18,000,000 19,000,000 17,000,000 18,000,000 18,000,000 18,000,000 17,000,000 16,000,000 13,000,000 12,000,000 11,000,000 19,000,000 12,000,000 12,000,000 11,000,000 13,000,000 11,000,000 12,000,000 11,000,000 12,000,000 11,000,000                     
      interest expense, bank fees and other
    13,000,000 14,000,000 13,000,000 15,000,000 14,000,000 109,000,000 -15,000,000 -16,000,000 -16,000,000 -17,000,000 -10,000,000 -6,000,000 -7,000,000 -6,000,000 -22,000,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -8,000,000 -4,000,000 -4,000,000 -4,000,000 -6,000,000 -6,000,000 -5,000,000 -12,000,000 -2,000,000 -4,000,000 -4,000,000                 
      total costs and operating expenses
    1,103,000,000 886,500,000 1,182,000,000 1,187,000,000 1,177,000,000 866,500,000 1,179,000,000 1,146,000,000 1,142,000,000 1,158,000,000 1,106,000,000 1,112,000,000 1,077,000,000 1,170,000,000 1,121,000,000 1,081,000,000 1,014,000,000 1,141,000,000 1,043,000,000 979,000,000 922,000,000 1,033,000,000 930,000,000 775,000,000 928,000,000 955,000,000 901,000,000 880,000,000 852,000,000 875,000,000 813,000,000 774,000,000 790,000,000 799,637,000 756,534,000 743,706,000 758,123,000 768,354,000 741,485,000 719,479,000 707,037,000 696,086,000 656,326,000 634,022,000 594,537,000 583,423,000 534,705,000 504,977,000 483,635,000 
      income before tax
    123,000,000 1,000,000 50,000,000 51,000,000 115,000,000                                             
      income taxes
    34,000,000 2,000,000 16,000,000 14,000,000 30,000,000 -14,000,000 13,000,000 21,000,000 33,000,000 18,000,000 30,000,000 28,000,000 49,000,000 16,000,000 26,000,000 31,000,000 54,000,000 17,000,000 26,000,000 26,000,000 34,000,000 4,000,000 6,000,000 45,000,000 30,000,000                         
      net income
    89,000,000 -1,000,000 34,000,000 37,000,000 85,000,000 -23,000,000 45,000,000 60,000,000 91,000,000 67,000,000 94,000,000 83,000,000 131,000,000 48,000,000 77,000,000 85,000,000 146,000,000 69,000,000 77,000,000 91,000,000 101,000,000 22,000,000 33,000,000 126,000,000 91,000,000 48,000,000 55,000,000 46,000,000 63,000,000 29,000,000 51,000,000 58,000,000 54,000,000 66,476,000 42,836,000 39,951,000 28,737,000 22,966,000 14,581,000 12,282,000 11,577,000 14,095,000 3,097,000  15,811,000 7,011,000 725,000 6,221,000 1,540,000 
      yoy
    4.71% -95.65% -24.44% -38.33% -6.59% -134.33% -52.13% -27.71% -30.53% 39.58% 22.08% -2.35% -10.27% -30.43% 0.00% -6.59% 44.55% 213.64% 133.33% -27.78% 10.99% -54.17% -40.00% 173.91% 44.44% 65.52% 7.84% -20.69% 16.67% -56.38% 19.06% 45.18% 87.91% 189.45% 193.78% 225.28% 148.22% 62.94% 370.81%  -26.78% 101.04% 327.17%  926.69%     
      qoq
    -9000.00% -102.94% -8.11% -56.47% -469.57% -151.11% -25.00% -34.07% 35.82% -28.72% 13.25% -36.64% 172.92% -37.66% -9.41% -41.78% 111.59% -10.39% -15.38% -9.90% 359.09% -33.33% -73.81% 38.46% 89.58% -12.73% 19.57% -26.98% 117.24% -43.14% -12.07% 7.41% -18.77% 55.19% 7.22% 39.02% 25.13% 57.51% 18.72% 6.09% -17.86% 355.12%   125.52% 867.03% -88.35% 303.96%  
      net income margin %
    7.26% -0.08% 2.76% 2.99% 6.58% -1.73% 3.64% 4.89% 7.20% 5.38% 7.69% 6.87% 10.51% 3.92% 6.20% 7.08% 11.99% 5.60% 6.71% 8.27% 9.53% 2.07% 3.38% 13.29% 8.68% 4.72% 5.68% 4.92% 6.75% 3.16% 5.83% 6.82% 6.27% 7.84% 5.23% 4.99% 3.56% 2.83% 1.89% 1.65% 1.58% 1.94% 0.46% 0% 2.53% 1.16% 0.13% 1.18% 0.30% 
      other comprehensive income, net of income taxes
    -2,000,000   1,000,000 2,000,000 -5,000,000 7,000,000  -3,000,000 6,000,000 -2,000,000  3,000,000  7,000,000   -2,000,000 -2,000,000  -1,000,000   3,000,000 2,000,000                         
      comprehensive income
    87,000,000 -1,000,000 34,000,000 38,000,000 87,000,000 -28,000,000 52,000,000 60,000,000 88,000,000 73,000,000 92,000,000 79,000,000 134,000,000 48,000,000 84,000,000 82,000,000 138,000,000 67,000,000 75,000,000 91,000,000 100,000,000 22,000,000 33,000,000 129,000,000 93,000,000 47,000,000 55,000,000 47,000,000 63,000,000 29,000,000 51,000,000 58,000,000 54,000,000 66,245,000 42,987,000 40,019,000 28,749,000             
      net income per share
                                                     
      basic
    1.9  0.7 0.77 1.72 -0.44 0.9 1.21 1.8 1.38 1.65 1.4 2.18 0.81 1.23 1.36 2.23 1.05 1.17 1.38 1.53 0.34 0.49 1.88 1.32 0.69 0.8 0.65 0.91 0.4 0.73 0.82 0.77 0.95 0.62 0.58 0.42 0.33 0.21 0.17 0.16 0.2 0.04  0.23 0.11 0.01 0.09 0.03 
      diluted
    1.9 0.01 0.7 0.77 1.71 -0.44 0.89 1.2 1.78 1.36 1.63 1.38 2.17 0.8 1.22 1.35 2.21 1.04 1.16 1.37 1.51 0.33 0.48 1.87 1.31 0.68 0.78 0.64 0.89 0.4 0.71 0.8 0.75 0.92 0.6 0.56 0.41 0.32 0.2 0.17 0.16 0.2 0.04  0.22 0.09 0.01 0.09 0.03 
      weighted-average shares:
                                                     
      basic
    47 48 48 48 49 50 50 50 51 57 57 60 60 63 62 62 65 66 66 66 66 67 67 67 68 70 69,612,362 69,703,792 69,909,984 70,385,639 70,556,877 70,448,809 70,047,752 69,175,377 69,498,218 69,029,749 68,509,328 70,159,696 70,187,989 70,728,934 70,521,066 70,228,159 70,237,737 70,305,185 70,198,184 56,160,539 69,134,908 69,053,403 16,775,513 
      diluted
    47 49 48 49 49 50 50 51 51 57 58 60 60 64 63 63 66 67 67 67 67 68 68 68 69 71 70,972,874 71,074,751 71,247,427 72,300,663 72,599,944 72,561,891 72,274,821 71,385,280 71,499,591 71,167,177 70,913,970 71,972,486 71,964,603 72,319,992 71,745,753 72,618,069 72,087,917 70,305,185 73,350,219 59,566,773 72,954,352 72,658,822 19,397,777 
      operating income
         65,250,000 58,000,000 80,000,000 122,000,000 87,000,000 116,000,000 97,000,000 169,000,000 56,000,000 120,000,000 119,000,000 204,000,000 91,000,000 105,000,000 121,000,000 138,000,000 30,000,000 45,000,000 173,000,000 120,000,000 63,000,000 68,000,000 55,000,000 82,000,000 42,000,000 62,000,000 76,000,000 71,000,000 47,919,000 62,759,000 56,835,000 49,487,000 42,717,000 28,972,000 26,367,000 25,902,000 29,609,000 11,682,000 5,985,000 31,041,000 20,239,000 21,246,000 20,029,000 25,277,000 
      yoy
         -25.00% -50.00% -17.53% -27.81% 55.36% -3.33% -18.49% -17.16% -38.46% 14.29% -1.65% 47.83% 203.33% 133.33% -30.06% 15.00% -52.38% -33.82% 214.55% 46.34% 50.00% 9.68% -27.63% 15.49% -12.35% -1.21% 33.72% 43.47% 12.18% 116.62% 115.55% 91.05% 44.27% 148.01% 340.55% -16.56% 46.30% -45.02% -70.12% 22.80%     
      qoq
         12.50% -27.50% -34.43% 40.23% -25.00% 19.59% -42.60% 201.79% -53.33% 0.84% -41.67% 124.18% -13.33% -13.22% -12.32% 360.00% -33.33% -73.99% 44.17% 90.48% -7.35% 23.64% -32.93% 95.24% -32.26% -18.42% 7.04% 48.17% -23.65% 10.42% 14.85% 15.85% 47.44% 9.88% 1.80% -12.52% 153.46% 95.19% -80.72% 53.37% -4.74% 6.08% -20.76%  
      operating margin %
    0% 0% 0% 0% 0% 4.92% 4.69% 6.53% 9.65% 6.99% 9.49% 8.02% 13.56% 4.57% 9.67% 9.92% 16.75% 7.39% 9.15% 11.00% 13.02% 2.82% 4.62% 18.25% 11.45% 6.19% 7.02% 5.88% 8.78% 4.58% 7.09% 8.94% 8.25% 5.65% 7.66% 7.10% 6.13% 5.27% 3.76% 3.54% 3.53% 4.08% 1.75% 0.94% 4.96% 3.35% 3.82% 3.82% 4.97% 
      other income:
                                                     
      income before provision for income taxes
         65,750,000 58,000,000 81,000,000 124,000,000 85,000,000 124,000,000 111,000,000 180,000,000 64,000,000 103,000,000 116,000,000 200,000,000 86,000,000 103,000,000 117,000,000 135,000,000 26,000,000 39,000,000 171,000,000 121,000,000 64,000,000 67,000,000 56,000,000 83,000,000 42,000,000 60,000,000 72,000,000 67,000,000 44,757,000 58,104,000 52,249,000 44,890,000 38,454,000 23,688,000 21,492,000 20,818,000 25,082,000 7,352,000 1,289,000 26,287,000 15,441,000 2,963,000 11,144,000 3,528,000 
      other comprehensive loss, net of income taxes
               -4,000,000    -3,000,000 -8,000,000                                 
      income tax expense
                             10,500,000 12,000,000 10,000,000 20,000,000 13,000,000 9,000,000 14,000,000 13,000,000 -21,719,000 15,268,000 12,298,000 16,153,000             
      other comprehensive income, net of tax
                             250,000  1,000,000      57,750 151,000 68,000 12,000             
      depreciation
                                 6,500,000 10,000,000 8,000,000 8,000,000 7,647,000 7,754,000 6,451,000 6,148,000 5,688,000 5,188,000 4,559,000 3,916,000 3,851,000 4,132,000 3,195,000 3,434,000 4,118,000 3,265,000 3,242,000 3,218,000 
      amortization of intangible assets
                                 1,000,000 1,000,000 2,000,000 1,000,000 1,034,000 1,300,000 1,316,000 1,350,000 1,350,000 4,662,000 5,005,000 4,980,000 7,062,000 10,459,000 10,608,000 11,217,000 12,743,000 12,743,000 13,267,000 13,549,000 
      interest expense and bank fees
                                     -4,970,000 -5,425,000 -4,857,000 -4,748,000 -4,580,000 -5,597,000 -5,038,000 -5,042,000 -4,796,000 -4,685,000       
      other
                                     1,808,000 770,000 271,000 151,000 317,000 313,000 163,000 -42,000 269,000 355,000 68,000 450,000 221,000 179,000  103,000 
      costs and operating expenses:
                                                     
      systems development and programming costs
                                         5,242,500 8,124,000 6,457,000 6,389,000 5,709,000 6,991,000 7,633,000 7,225,000 6,866,000 6,776,000 6,565,000 5,894,000 
      provision for income taxes
                                         6,889,500 9,107,000 9,210,000 9,241,000 10,987,000 4,255,000 2,597,000 10,476,000 8,430,000 2,238,000 4,923,000 1,988,000 
      net income (loss) per share:
                                                     
      basic
                                                     
      diluted
                                                     
    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 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 
                                                       
        assets
                                                       
        current assets:
                                                       
        cash and cash equivalents
      340,000,000 287,000,000 321,000,000 407,000,000 349,000,000 360,000,000 251,000,000 177,000,000 298,000,000 287,000,000 170,000,000 482,000,000 707,000,000 354,000,000 454,000,000 336,000,000 235,000,000 612,000,000 525,000,000 464,000,000 500,000,000 301,000,000 563,000,000 637,000,000 521,000,000 213,000,000 216,000,000 219,000,000 251,000,000 228,000,000 237,000,000 202,000,000 330,000,000 336,000,000 263,527,000 233,883,000 216,054,000 184,004,000 160,558,000 166,664,000 195,938,000 166,178,000 146,315,000 128,413,000 104,401,000 134,341,000 97,952,000 100,288,000 122,601,000 
        restricted cash, cash equivalents and investments
      1,122,000,000 1,694,000,000 1,108,000,000 1,101,000,000 1,024,000,000 1,413,000,000 780,000,000 893,000,000 1,059,000,000 1,269,000,000 833,000,000 1,074,000,000 1,016,000,000 1,263,000,000 837,000,000 1,028,000,000 1,216,000,000 1,195,000,000 1,040,000,000 958,000,000 1,081,000,000 1,388,000,000 832,000,000 735,000,000 779,000,000 1,180,000,000 585,000,000 672,000,000 722,000,000 942,000,000 621,000,000 629,000,000 699,000,000 162,000,000 160,207,000 150,939,000 127,715,000 130,501,000            
        accounts receivable
      7,000,000 20,000,000 10,000,000 12,000,000 21,000,000 32,000,000 15,000,000 15,000,000 11,000,000 18,000,000 21,000,000 18,000,000 15,000,000 19,000,000 9,000,000 9,000,000 10,000,000 15,000,000 8,000,000 8,000,000 5,000,000 18,000,000 6,000,000 5,000,000 9,000,000 9,000,000 9,000,000 10,000,000 12,000,000 11,000,000 5,000,000 7,000,000 8,000,000                 
        payroll funds receivable
      451,000,000 264,000,000 476,000,000 487,000,000 478,000,000 349,000,000                                            
        prepaid expenses
      64,000,000 82,000,000 53,000,000 50,000,000 60,000,000 64,000,000 64,000,000 76,000,000 79,000,000 67,000,000 75,000,000 72,000,000 85,000,000 71,000,000 63,000,000 62,000,000 55,000,000 67,000,000 73,000,000 68,000,000 58,000,000 63,000,000 53,000,000 50,000,000 55,000,000 52,000,000 63,000,000 64,000,000 58,000,000 48,000,000    8,000,000 11,013,000 13,013,000 9,051,000 10,784,000 13,018,000 12,922,000 9,457,000 8,579,000 12,794,000 14,541,000 10,001,000 9,336,000 9,636,000 9,094,000 7,153,000 
        other payroll assets
      449,000,000 474,000,000 481,000,000 660,000,000 881,000,000 916,000,000 883,000,000 800,000,000 791,000,000 381,000,000 226,000,000 54,000,000 302,000,000 122,000,000                 45,000,000 49,000,000 41,000,000                 
        other current assets
      51,000,000 47,000,000 49,000,000 45,000,000 44,000,000 46,000,000 51,000,000 48,000,000 50,000,000 44,000,000 49,000,000 45,000,000 44,000,000 46,000,000 144,000,000 93,000,000 106,000,000 91,000,000 95,000,000 109,000,000 105,000,000 87,000,000 89,000,000 80,000,000 83,000,000 64,000,000 69,000,000 73,000,000 81,000,000 59,000,000    2,000,000 2,360,000 2,172,000 2,005,000 2,145,000 2,173,000 2,049,000 1,638,000         
        total current assets
      2,484,000,000 2,868,000,000 2,498,000,000 2,762,000,000 2,857,000,000 3,180,000,000 2,605,000,000 2,566,000,000 2,840,000,000 2,578,000,000 1,853,000,000 2,177,000,000 2,629,000,000 2,326,000,000 1,965,000,000 1,957,000,000 2,093,000,000 2,439,000,000 2,201,000,000 2,084,000,000 2,160,000,000 2,160,000,000 1,979,000,000 1,935,000,000 1,892,000,000 1,871,000,000 1,375,000,000 1,455,000,000 1,494,000,000 1,646,000,000 1,337,000,000 1,249,000,000 1,419,000,000 1,991,000,000 1,233,558,000 1,176,969,000 1,308,620,000 1,535,354,000 1,044,167,000 1,151,435,000 1,248,419,000 1,570,520,000 1,065,874,000 1,020,322,000 1,066,548,000 1,824,338,000 857,487,000 806,018,000 822,954,000 
        restricted cash, cash equivalents and investments, noncurrent
      122,000,000 128,000,000 125,000,000 124,000,000 134,000,000 145,000,000 153,000,000 163,000,000 152,000,000 158,000,000 154,000,000 157,000,000 155,000,000 153,000,000 151,000,000 149,000,000 163,000,000 166,000,000 176,000,000 179,000,000 184,000,000 210,000,000 205,000,000 204,000,000 204,000,000 212,000,000 198,000,000 200,000,000 184,000,000 187,000,000 181,000,000 179,000,000 182,000,000                 
        property and equipment
      22,000,000 11,000,000 11,000,000 10,000,000 9,000,000 10,000,000 14,000,000 14,000,000 15,000,000 17,000,000 16,000,000 29,000,000 31,000,000 24,000,000                 78,000,000 79,000,000 74,000,000 70,000,000 68,470,000 66,827,000 63,417,000 58,622,000 53,141,000 47,320,000 41,879,000 37,844,000 36,352,000 36,134,000 33,769,000 32,298,000 32,353,000 30,389,000 26,648,000 
        operating lease right-of-use asset
      38,000,000 36,000,000 37,000,000 39,000,000 22,000,000 24,000,000 30,000,000 21,000,000 22,000,000 24,000,000 24,000,000 27,000,000 29,000,000 31,000,000 38,000,000 45,000,000 48,000,000 42,000,000 44,000,000 48,000,000 51,000,000 51,000,000 42,000,000 46,000,000 52,000,000 55,000,000 57,000,000 60,000,000 59,000,000                     
        goodwill
      461,000,000 461,000,000 461,000,000 461,000,000 461,000,000 461,000,000 462,000,000 462,000,000 462,000,000 462,000,000 462,000,000 462,000,000 462,000,000 462,000,000 462,000,000 430,000,000 433,000,000 294,000,000 294,000,000 294,000,000 294,000,000 294,000,000 294,000,000 289,000,000 289,000,000 289,000,000 289,000,000 289,000,000 289,000,000 289,000,000    289,000,000 289,207,000 289,207,000 289,207,000 289,207,000 289,207,000 289,207,000 289,207,000 289,207,000 290,507,000 288,857,000 288,857,000 288,857,000 288,857,000 288,857,000 288,857,000 
        software and other intangible assets
      155,000,000 153,000,000 151,000,000 148,000,000 146,000,000 156,000,000 179,000,000 176,000,000 174,000,000 172,000,000 169,000,000 156,000,000 155,000,000 163,000,000                                    
        other assets
      138,000,000 140,000,000 142,000,000 144,000,000 146,000,000 143,000,000 141,000,000 145,000,000 142,000,000 139,000,000 145,000,000 136,000,000 133,000,000 133,000,000 128,000,000 125,000,000 120,000,000 115,000,000 102,000,000 94,000,000 94,000,000 93,000,000 107,000,000 105,000,000 102,000,000 96,000,000 95,000,000 90,000,000 85,000,000 78,000,000 27,000,000 23,000,000 18,000,000 14,000,000 18,444,000 19,282,000 19,234,000 18,502,000 18,431,000 18,817,000 19,565,000         
        total assets
      3,420,000,000 3,797,000,000 3,425,000,000 3,688,000,000 3,775,000,000 4,119,000,000 3,729,000,000 3,703,000,000 3,968,000,000 3,693,000,000 2,966,000,000 3,290,000,000 3,736,000,000 3,443,000,000 3,079,000,000 3,044,000,000 3,204,000,000 3,309,000,000 3,069,000,000 2,978,000,000 3,005,000,000 3,043,000,000 2,867,000,000 2,802,000,000 2,765,000,000 2,748,000,000 2,245,000,000 2,318,000,000 2,345,000,000 2,435,000,000 2,104,000,000 2,015,000,000 2,047,000,000 2,593,000,000 1,836,925,000 1,758,695,000 1,872,672,000 2,095,143,000 1,600,326,000 1,696,476,000 1,781,556,000 2,098,230,000 1,609,571,000 1,557,045,000 1,620,215,000 2,347,764,000 1,393,305,000 1,333,048,000 1,340,427,000 
        liabilities and stockholders' equity
                                                       
        current liabilities:
                                                       
        accounts payable and other current liabilities
      89,000,000 86,000,000 89,000,000 85,000,000 82,000,000 89,000,000 82,000,000 85,000,000 122,000,000 87,000,000 109,000,000 100,000,000 130,000,000 98,000,000 122,000,000 108,000,000 118,000,000 86,000,000 70,000,000 81,000,000 84,000,000 50,000,000 42,000,000 101,000,000 63,000,000 31,000,000 33,000,000 40,000,000 55,000,000 45,000,000 43,000,000 39,000,000 46,000,000                 
        client deposits and other client liabilities
      49,000,000 57,000,000 43,000,000 41,000,000 49,000,000 76,000,000 39,000,000 70,000,000 51,000,000 65,000,000 73,000,000 78,000,000 131,000,000 106,000,000 54,000,000 74,000,000 124,000,000 97,000,000 120,000,000 132,000,000 151,000,000 134,000,000 209,000,000 146,000,000                          
        accrued wages
      542,000,000 555,000,000 549,000,000 562,000,000 544,000,000 580,000,000 566,000,000 558,000,000 537,000,000 515,000,000 458,000,000 437,000,000 416,000,000 437,000,000 413,000,000 568,000,000 561,000,000 369,000,000 555,000,000 506,000,000 488,000,000 309,000,000 455,000,000 411,000,000 429,000,000 391,000,000 405,000,000 377,000,000 369,000,000 352,000,000 326,000,000 269,000,000 284,000,000                 
        accrued health insurance costs
      193,000,000 207,000,000 197,000,000 191,000,000 189,000,000 189,000,000 193,000,000 182,000,000 167,000,000 175,000,000 183,000,000 170,000,000 169,000,000 174,000,000 165,000,000 151,000,000 166,000,000 174,000,000 162,000,000 155,000,000 165,000,000 172,000,000 160,000,000 145,000,000 165,000,000 167,000,000 156,000,000 143,000,000 135,000,000 135,000,000                    
        accrued workers' compensation costs
      44,000,000 42,000,000 45,000,000 46,000,000 45,000,000 44,000,000 44,000,000 43,000,000 51,000,000 50,000,000 51,000,000 51,000,000 54,000,000 54,000,000 55,000,000 54,000,000 48,000,000 55,000,000 54,000,000 57,000,000 59,000,000 59,000,000 60,000,000 62,000,000 63,000,000 61,000,000 63,000,000 64,000,000 67,000,000 67,000,000                    
        payroll tax liabilities and other payroll withholdings
      1,289,000,000 1,671,000,000 1,308,000,000 1,484,000,000 1,645,000,000 1,906,000,000 1,420,000,000 1,421,000,000 1,611,000,000 1,438,000,000 804,000,000 846,000,000 1,007,000,000 1,087,000,000 677,000,000 597,000,000 739,000,000 929,000,000 567,000,000 572,000,000 668,000,000 1,095,000,000 434,000,000 426,000,000 567,000,000 901,000,000 389,000,000 473,000,000 550,000,000 729,000,000 419,000,000 442,000,000 500,000,000                 
        operating lease liabilities
      11,000,000 10,000,000 10,000,000 3,000,000 12,000,000 13,000,000 15,000,000 13,000,000 14,000,000 14,000,000 15,000,000 15,000,000 16,000,000 15,000,000 15,000,000 15,000,000 15,000,000 11,000,000 12,000,000 12,000,000 12,000,000 11,000,000 11,000,000 13,000,000 16,000,000 17,000,000 17,000,000 17,000,000 16,000,000                     
        insurance premiums and other payables
      9,000,000 9,000,000 8,000,000 6,000,000 6,000,000 9,000,000 6,000,000 7,000,000 7,000,000 10,000,000 10,000,000 10,000,000 17,000,000 17,000,000 20,000,000 16,000,000 17,000,000 18,000,000 16,000,000 15,000,000 13,000,000 18,000,000 10,000,000 11,000,000 11,000,000 9,000,000 9,000,000 16,000,000 16,000,000 19,000,000 17,000,000 22,000,000 25,000,000                 
        total current liabilities
      2,226,000,000 2,637,000,000 2,249,000,000 2,508,000,000 2,646,000,000 2,981,000,000 2,440,000,000 2,463,000,000 2,669,000,000 2,463,000,000 1,703,000,000 1,707,000,000 2,235,000,000 1,988,000,000 1,521,000,000 1,583,000,000 1,788,000,000 1,739,000,000 1,556,000,000 1,530,000,000 1,640,000,000 1,870,000,000 1,637,000,000 1,571,000,000 1,608,000,000 1,643,000,000 1,122,000,000 1,219,000,000 1,268,000,000 1,425,000,000 1,111,000,000 1,061,000,000 1,172,000,000 1,757,000,000 1,046,716,000 1,008,288,000 1,148,751,000 1,378,583,000 938,509,000 1,021,911,000 1,117,617,000 1,458,092,000 1,011,464,000 969,594,000 1,051,384,000 1,768,761,000 840,214,000 735,690,000 729,193,000 
        long-term debt, noncurrent
      896,000,000 895,000,000 895,000,000 894,000,000 909,000,000 908,000,000 993,000,000 984,000,000 984,000,000 984,000,000 1,091,000,000 496,000,000 496,000,000 496,000,000 496,000,000 495,000,000 495,000,000 495,000,000 495,000,000 495,000,000 494,000,000 348,000,000 353,000,000 358,000,000 364,000,000 369,000,000 375,000,000 380,000,000 385,000,000                     
        accrued workers' compensation costs, noncurrent
      109,000,000 106,000,000 110,000,000 109,000,000 111,000,000 110,000,000 107,000,000 107,000,000 120,000,000 120,000,000 122,000,000 122,000,000 127,000,000 128,000,000 129,000,000 127,000,000 143,000,000 135,000,000 137,000,000 133,000,000 138,000,000 138,000,000 142,000,000 141,000,000 145,000,000 144,000,000 146,000,000 148,000,000 156,000,000                     
        deferred taxes
      54,000,000 55,000,000 9,000,000 10,000,000 10,000,000 11,000,000 18,000,000 13,000,000 13,000,000 13,000,000 5,000,000 7,000,000 9,000,000 8,000,000 29,000,000 22,000,000 26,000,000 11,000,000 21,000,000 21,000,000 21,000,000 22,000,000 64,000,000 63,000,000 62,000,000 61,000,000 64,000,000 67,000,000 65,000,000 68,000,000                    
        operating lease liabilities, noncurrent
      39,000,000 37,000,000 38,000,000 48,000,000 24,000,000 26,000,000 30,000,000 24,000,000 27,000,000 30,000,000 30,000,000 33,000,000 36,000,000 41,000,000 41,000,000 45,000,000 48,000,000 41,000,000 43,000,000 46,000,000 49,000,000 49,000,000 41,000,000 43,000,000 45,000,000 48,000,000 52,000,000 55,000,000 54,000,000                     
        other non-current liabilities
      13,000,000  14,000,000 12,000,000 12,000,000  12,000,000 12,000,000 12,000,000  5,000,000 10,000,000 8,000,000 7,000,000 7,000,000 9,000,000 9,000,000 7,000,000 8,000,000 9,000,000 10,000,000 9,000,000 10,000,000 10,000,000 8,000,000 8,000,000 9,000,000 10,000,000 11,000,000 18,000,000                    
        total liabilities
      3,337,000,000 3,743,000,000 3,315,000,000 3,581,000,000 3,712,000,000 4,050,000,000 3,600,000,000 3,603,000,000 3,825,000,000 3,615,000,000 2,956,000,000 2,375,000,000 2,911,000,000 2,668,000,000 2,223,000,000 2,281,000,000 2,509,000,000 2,428,000,000 2,260,000,000 2,234,000,000 2,352,000,000 2,436,000,000 2,247,000,000 2,186,000,000 2,232,000,000 2,273,000,000 1,768,000,000 1,879,000,000 1,939,000,000 2,060,000,000 1,754,000,000 1,706,000,000 1,785,000,000 2,387,000,000 1,705,066,000 1,667,182,000 1,830,125,000 2,060,553,000 1,571,411,000 1,663,013,000 1,754,814,000 2,090,149,000 1,623,670,000 1,564,987,000 1,635,314,000 2,373,523,000 1,442,218,000 1,369,707,000 1,386,551,000 
        commitments and contingencies
                                                       
        stockholders' equity:
                                                       
        preferred stock
                                                       
        common shares, ...
      1,151,000,000 1,135,000,000 1,112,000,000 1,095,000,000 1,070,000,000 1,056,000,000 1,037,000,000 1,021,000,000 996,000,000 976,000,000 953,000,000 934,000,000 910,000,000 899,000,000 878,000,000 861,000,000 837,000,000 808,000,000 790,000,000 776,000,000 758,000,000 747,000,000 730,000,000 719,000,000 703,000,000 694,000,000 676,000,000 667,000,000 651,000,000 641,000,000 623,000,000 611,000,000 595,000,000 583,000,000 567,971,000 557,183,000 543,600,000 535,132,000            
        accumulated deficit
      -1,066,000,000  -1,002,000,000 -988,000,000 -1,006,000,000  -910,000,000 -916,000,000 -848,000,000  -935,000,000 -13,000,000        -35,000,000 -108,000,000 -144,000,000 -115,000,000 -108,000,000 -172,000,000 -219,000,000 -200,000,000 -229,000,000 -245,000,000 -266,000,000 -273,000,000 -302,000,000 -332,000,000 -377,000,000 -435,739,000 -465,146,000 -500,461,000 -499,938,000 -493,574,000 -479,680,000 -474,674,000 -485,595,000 -499,467,000 -483,982,000 -477,341,000 -468,127,000 -460,120,000 -460,711,000 -466,120,000 
        accumulated other comprehensive loss
      -2,000,000    -1,000,000 -3,000,000 2,000,000 -5,000,000 -5,000,000 -2,000,000 -8,000,000 -6,000,000 -2,000,000 -5,000,000 -5,000,000 -12,000,000 -9,000,000                -1,000,000  -373,000 -524,000 -592,000 -604,000 -421,000 -296,000 -370,000 -721,000 -505,000 -386,000 -413,000 -314,000 -242,000 -170,000 -216,000 
        total stockholders' equity
      83,000,000 54,000,000 110,000,000 107,000,000 63,000,000 69,000,000 129,000,000 100,000,000 143,000,000 78,000,000 10,000,000 915,000,000 825,000,000 775,000,000 856,000,000 763,000,000 695,000,000 881,000,000 809,000,000 744,000,000 653,000,000 607,000,000 620,000,000 616,000,000 533,000,000 475,000,000 477,000,000 439,000,000 406,000,000 375,000,000                    
        total liabilities & stockholders' equity
      3,420,000,000 3,797,000,000 3,425,000,000 3,688,000,000 3,775,000,000 4,119,000,000 3,729,000,000 3,703,000,000 3,968,000,000 3,693,000,000 2,966,000,000 3,290,000,000 3,736,000,000 3,443,000,000 3,079,000,000 3,044,000,000 3,204,000,000 3,309,000,000 3,069,000,000 2,978,000,000 3,005,000,000 3,043,000,000 2,867,000,000 2,802,000,000 2,765,000,000 2,748,000,000 2,245,000,000 2,318,000,000 2,345,000,000 2,435,000,000                    
        revolving credit agreement borrowings
         90,000,000 74,000,000 75,000,000 75,000,000 84,000,000 109,000,000 109,000,000   295,000,000          234,000,000 234,000,000 234,000,000                         
        other non current liabilities
       13,000,000    14,000,000    5,000,000                                        
        retained earnings
       -1,081,000,000    -984,000,000    -896,000,000   -83,000,000 -119,000,000 -17,000,000 -86,000,000 -133,000,000 74,000,000 18,000,000                               
        investments
            50,000,000 72,000,000 85,000,000 65,000,000 75,000,000 69,000,000 89,000,000 76,000,000 95,000,000 120,000,000 154,000,000 135,000,000 155,000,000 131,000,000 71,000,000 57,000,000 61,000,000 76,000,000 65,000,000 68,000,000 67,000,000 76,000,000 56,000,000 54,000,000 38,000,000 29,000,000                  
        investments, noncurrent
            145,000,000 156,000,000 161,000,000 143,000,000 143,000,000 146,000,000 142,000,000 151,000,000 142,000,000 159,000,000 165,000,000 168,000,000 167,000,000 194,000,000 130,000,000 138,000,000 141,000,000 128,000,000 130,000,000 125,000,000 128,000,000 117,000,000 133,000,000 135,000,000 130,000,000 133,000,000                  
        unbilled revenue
            511,000,000 485,000,000 467,000,000 447,000,000 404,000,000 363,000,000 371,000,000 375,000,000 363,000,000 309,000,000 317,000,000 324,000,000 305,000,000 346,000,000 340,000,000 246,000,000 375,000,000 352,000,000 380,000,000 285,000,000 366,000,000 341,000,000 314,000,000 304,000,000 306,000,000 268,000,000 286,000,000                 
        property, equipment and software
                    90,000,000 84,000,000 82,000,000 79,000,000 78,000,000 76,000,000 75,000,000 79,000,000 80,000,000 82,000,000 82,000,000 85,000,000                        
        other intangible assets
                    103,000,000 95,000,000 100,000,000 6,000,000 7,000,000 9,000,000 17,000,000 18,000,000 19,000,000 13,000,000 14,000,000 15,000,000 17,000,000 18,000,000 19,000,000 21,000,000    26,000,000 27,108,000 28,408,000 29,724,000 31,074,000 32,424,000 37,087,000 42,092,000 46,772,000 52,534,000 59,893,000 70,501,000 81,718,000 94,461,000 107,204,000 120,471,000 
        long-term debt
                           22,000,000 22,000,000 22,000,000 22,000,000 22,000,000 22,000,000 22,000,000 22,000,000                     
        accumulated other comprehensive income
                       -1,000,000 1,000,000 3,000,000 3,000,000 4,000,000 5,000,000 5,000,000 2,000,000  1,000,000 1,000,000                      
        client deposits
                              38,000,000 44,000,000 28,000,000 67,000,000 38,000,000 56,000,000 35,000,000 28,000,000 26,000,000                 
        property & equipment
                                86,000,000 89,000,000 82,000,000 79,000,000                    
        long-term debt, current portion
                                   22,000,000                    
        long-term debt, less current portion
                                   391,000,000                    
        accrued workers' compensation costs, less current portion
                                   158,000,000                    
        worksite employee related assets:
                                                       
        prepaid insurance premiums and other insurance related receivables (net of health benefit loss reserves of 45 and 0 at september 30, 2018 and december 31, 2017, respectively
                                    47,000,000                   
        worksite employee related assets
                                    403,000,000 352,000,000 368,000,000 1,625,000,000 941,213,000 898,596,000 1,039,349,000 1,281,471,000 847,545,000 947,571,000 1,026,823,000 1,373,386,000 867,126,000 838,239,000 922,619,000 1,635,136,000 697,047,000 664,279,000 663,800,000 
        prepaid expenses and other current assets
                                    38,000,000 37,000,000 22,000,000                 
        workers' compensation collateral receivable
                                    40,000,000 40,000,000 40,000,000 39,000,000 39,931,000 27,063,000 34,755,000 31,883,000            
        goodwill and other intangible assets
                                    311,000,000 312,000,000 314,000,000                 
        liabilities and stockholders’ equity
                                                       
        accrued corporate wages
                                    37,000,000 35,000,000 31,000,000 40,000,000 31,814,000 38,196,000 40,908,000 30,937,000 29,039,000 25,676,000 24,106,000 28,963,000 34,559,000 26,250,000 27,415,000 29,179,000 31,538,000 23,095,000 19,524,000 
        notes payable
                                    22,000,000 21,000,000 43,000,000 40,000,000                
        worksite employee related liabilities:
                                                       
        health benefits loss reserves
                                    144,000,000 138,000,000 150,000,000                 
        workers' compensation loss reserves
                                    68,000,000 67,000,000 67,000,000 165,000,000 157,999,000 151,837,000 164,671,000 159,301,000            
        worksite employee related liabilities
                                    1,009,000,000 966,000,000 1,052,000,000 1,618,000,000 934,868,000 893,110,000 1,034,093,000 1,275,995,000 842,552,000 943,403,000 1,022,458,000 1,369,497,000 862,003,000 832,531,000 915,985,000 1,630,555,000 690,703,000 658,040,000 657,567,000 
        notes payable, noncurrent
                                    396,000,000 402,000,000 370,000,000 383,000,000                
        deferred income taxes
                                    72,000,000 70,000,000 71,000,000 68,000,000 90,845,000 91,828,000 91,847,000 92,373,000 54,411,000 54,815,000 54,773,000 54,641,000 69,228,000 67,777,000 65,713,000  68,000 68,000 68,000 
        other liabilities
                                    16,000,000 16,000,000 10,000,000 14,000,000 14,534,000 11,072,000 11,528,000 7,801,000 7,941,000 8,365,000 8,417,000 7,545,000 6,694,000 6,715,000 6,649,000 4,902,000 5,189,000 5,822,000 5,598,000 
        stockholders’ equity:
                                                       
        total stockholders’ equity
                                    350,000,000 309,000,000 262,000,000 206,000,000 131,859,000 91,513,000 42,547,000 34,590,000 28,915,000 33,463,000 26,742,000 8,081,000        
        total liabilities and stockholders’ equity
                                    2,104,000,000 2,015,000,000 2,047,000,000 2,593,000,000 1,836,925,000 1,758,695,000 1,872,672,000 2,095,143,000 1,600,326,000 1,696,476,000 1,781,556,000 2,098,230,000        
        prepaid insurance premiums and other insurance related receivables
                                     28,000,000 33,000,000                 
        restricted cash and cash equivalents
                                       15,000,000 15,445,000 14,589,000 14,578,000 14,569,000            
        prepaid income taxes
                                       5,000,000  14,716,000 27,583,000 42,381,000 6,310,000 7,671,000  4,105,000 21,071,000 20,431,000 10,411,000 26,711,000 32,973,000 12,821,000 8,873,000 
        deferred and other long term income taxes
                                       2,000,000         21,705,000 21,715,000 21,586,000     
        accounts payable
                                       45,000,000 28,995,000 26,599,000 22,598,000 22,541,000 18,461,000 16,629,000 20,106,000 12,904,000 14,863,000 12,354,000 11,182,000 12,273,000 11,422,000 13,145,000 8,505,000 
        other current liabilities
                                       14,000,000 14,321,000 13,735,000 14,546,000 12,551,000 11,960,000 11,197,000 12,492,000 11,402,000 10,537,000 10,410,000 10,784,000 10,303,000 12,736,000 9,943,000 16,569,000 
        notes and capital leases payable
                                        36,718,000 36,648,000 36,606,000 36,559,000            
        notes and capital leases payable, net, noncurrent
                                        394,972,000 404,157,000 413,328,000             
        notes and capital leases payables, net, noncurrent
                                           422,495,000            
        restricted cash
                                            14,563,000 14,558,000 14,563,000 14,557,000 14,554,000 14,550,000 14,546,000 14,543,000 14,538,000 15,050,000 15,269,000 
        workers compensation receivable
                                            40,578,000 39,803,000 36,892,000 29,204,000 28,974,000 37,238,000 54,130,000 31,905,000 38,142,000 40,826,000 22,356,000 
        restricted cash and available for sale investments
                                            122,378,000           
        current portion of notes payable and borrowings under capital leases
                                            36,497,000 25,006,000 35,358,000 35,326,000 20,274,000 20,272,000 20,305,000 20,738,000 20,694,000 6,061,000 6,589,000 
        notes payable and borrowings under capital leases, net, less current portion
                                            431,638,000 447,399,000          
        workers compensation liabilities
                                            138,912,000 130,523,000 119,900,000 105,481,000 121,028,000 99,125,000 82,748,000 75,448,000 67,273,000 56,253,000 49,712,000 
        preferred stock, 0.000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at september 30, 2016 and december 31, 2015
                                                       
        common stock
                                            522,910,000 513,439,000 501,786,000 494,397,000 485,873,000 476,426,000 462,655,000 442,682,000 411,449,000 424,222,000 420,212,000 
        restricted cash and investments
                                             112,807,000 103,502,000 101,806,000 104,348,000 82,853,000 73,964,000 69,447,000 62,454,000 43,454,000 41,927,000 
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at june 30, 2016 and december 31, 2015
                                                       
        income taxes payable
                                              3,097,000         
        notes payable and borrowings under capital leases, less current portion
                                              454,107,000 464,390,000 484,484,000 489,553,000 494,533,000 524,412,000 529,542,000 569,650,000 595,647,000 
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at march 31, 2016 and december 31, 2015
                                                       
        deferred loan costs and other current assets
                                               3,715,000 4,014,000 4,148,000 4,570,000 4,271,000 5,273,000 4,418,000 5,190,000 
        deferred loan costs and other assets
                                               22,877,000 9,277,000 10,033,000 10,860,000 12,017,000 11,930,000 15,300,000 16,214,000 
        stockholders’ equity
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at december 31, 2015 and december 31, 2014
                                                       
        liabilities and stockholders’ deficit
                                                       
        stockholders’ deficit:
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at september 30, 2015 and december 31, 2014
                                                       
        total stockholders’ deficit
                                                -14,099,000 -7,942,000 -15,099,000 -25,759,000 -48,913,000 -36,659,000 -46,124,000 
        total liabilities and stockholders’ deficit
                                                1,609,571,000 1,557,045,000 1,620,215,000 2,347,764,000 1,393,305,000 1,333,048,000 1,340,427,000 
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at june 30, 2015 and december 31, 2014
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at march 31, 2015 and december 31, 2014
                                                       
        series g convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 59,306); no shares authorized, issued and outstanding at december 31, 2014; 5,391,441 shares authorized, issued and outstanding at december 31, 2013
                                                       
        series h convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 60,000); no shares authorized, issued and outstanding at december 31, 2014; 4,124,986 shares authorized, issued and outstanding at december 31, 2013
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at december 31, 2014 and 2013
                                                       
        series g convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 59,306); no shares authorized, issued and outstanding at september 30, 2014; 5,391,441 shares authorized, issued and outstanding at december 31, 2013
                                                       
        series h convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 60,000); no shares authorized, issued and outstanding at september 30, 2014; 4,124,986 shares authorized, issued and outstanding at december 31, 2013
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at september 30, 2014 and december 31, 2013
                                                       
        series g convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 59,306); no shares authorized, issued and outstanding at june 30, 2014; 5,391,441 shares authorized, issued and outstanding at december 31, 2013
                                                       
        series h convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 60,000); no shares authorized, issued and outstanding at june 30, 2014; 4,124,986 shares authorized, issued and outstanding at december 31, 2013
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at june 30, 2014 and december 31, 2013
                                                       
        series g convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 59,306); no shares authorized, issued and outstanding at march 31, 2014; 5,391,441 shares authorized, issued and outstanding at december 31, 2013
                                                       
        series h convertible preferred stock, .0001 per share stated value (aggregate liquidation preference of 60,000); no shares authorized, issued and outstanding at march 31, 2014; 4,124,986 shares authorized, issued and outstanding at december 31, 2013
                                                       
        preferred stock, .000025 per share stated value; 20,000,000 shares authorized; no shares issued and outstanding at march 31, 2014 and december 31, 2013
                                                       
      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 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 
                                                         
          operating activities
                                                         
          net income
        89,000,000 -1,000,000 34,000,000 37,000,000 85,000,000 -23,000,000 44,000,000 61,000,000 91,000,000 67,000,000 94,000,000 83,000,000 131,000,000 48,000,000 77,000,000 84,000,000 146,000,000 69,000,000 77,000,000 91,000,000 101,000,000 22,000,000 33,000,000 126,000,000 91,000,000 48,000,000 55,000,000 46,000,000 63,000,000 29,000,000 51,000,000 58,000,000 54,000,000 66,476,000 42,836,000 39,951,000 28,737,000 22,966,000 14,581,000 12,282,000 11,577,000 14,095,000 3,097,000 -1,308,000 15,811,000 7,011,000 725,000 6,221,000 1,540,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                         
          depreciation and amortization of intangible assets
        17,000,000 16,000,000 17,000,000 16,000,000 17,000,000 19,000,000 19,000,000 19,000,000 18,000,000 19,000,000 17,000,000                                       
          amortization of deferred costs
        13,000,000 13,000,000 13,000,000 11,000,000 12,000,000 12,000,000 11,000,000 10,000,000 11,000,000 9,000,000 11,000,000                                       
          amortization of rou asset, lease modification, impairment, and abandonment
        2,000,000 2,000,000 2,000,000 1,000,000 2,000,000 7,000,000 1,000,000 1,000,000 2,000,000 4,000,000 3,000,000 2,000,000                                     
          deferred income taxes
         48,000,000 -2,000,000 -1,000,000 -5,000,000    7,000,000    -23,000,000   2,000,000                     42,118,000    13,119,000 -142,000   16,662,000 24,904,000 864,000 1,412,000 
          stock based compensation
        16,000,000 17,000,000 17,000,000 18,000,000 13,000,000 12,000,000 15,000,000 18,000,000 20,000,000 16,000,000 15,000,000 17,000,000 11,000,000 16,000,000 16,000,000 18,000,000 12,000,000 13,000,000 13,000,000 13,000,000 11,000,000 12,000,000 11,000,000 11,000,000 9,000,000 12,000,000                        
          other
        1,000,000  1,000,000 2,000,000 1,000,000  2,000,000    -1,000,000    -1,000,000 1,000,000 2,000,000                                
          changes in operating assets and liabilities:
                                                         
          accounts receivable
          1,000,000 -4,000,000 -1,000,000 -3,000,000 6,000,000 2,000,000 -3,000,000 -4,000,000 3,000,000  2,000,000 8,000,000 -7,000,000 -3,000,000 13,000,000 -12,000,000 1,000,000   2,000,000 2,000,000 1,000,000                     
          prepaid expenses
        22,000,000 -26,000,000 5,000,000 2,000,000 7,000,000 -21,000,000 12,000,000 3,000,000 -12,000,000 8,000,000        5,000,000 -5,000,000 -10,000,000 5,000,000 -11,000,000 -3,000,000 5,000,000 -3,000,000 12,000,000 1,000,000 -6,000,000 -12,000,000                     
          other assets
        -11,000,000 -12,000,000 -12,000,000 -12,000,000 -6,000,000 -8,000,000 -11,000,000 -12,000,000 -21,000,000 6,000,000        -16,000,000 -2,000,000 -8,000,000 -24,000,000 8,000,000 -14,000,000 -4,000,000 -28,000,000 -4,000,000 -30,000,000    -2,000,000 3,075,000 834,000 -57,000 148,000 -176,000 200,000 550,000 -312,000 58,000    -162,000 3,295,000 838,000 4,033,000 
          accounts payable and other liabilities
           6,000,000 -11,000,000  -2,000,000 -31,000,000 20,000,000    30,000,000  3,000,000 -8,000,000 10,000,000                                 
          accrued wages
         13,000,000 -5,000,000 7,000,000 -17,000,000 -57,000,000 9,000,000 20,000,000 23,000,000 56,000,000   -21,000,000 25,000,000 -156,000,000 8,000,000 188,000,000 -186,000,000 49,000,000 18,000,000 179,000,000 -145,000,000 43,000,000 -18,000,000 38,000,000 -13,000,000 28,000,000 8,000,000 17,000,000                     
          accrued health insurance costs
           1,000,000 -20,000,000 11,000,000 14,000,000 -7,000,000 -8,000,000 14,000,000 -5,000,000  13,000,000 -15,000,000 -8,000,000 12,000,000 7,000,000 -10,000,000 -7,000,000 12,000,000 15,000,000 -20,000,000 -2,000,000 11,000,000 12,000,000                       
          accrued workers' compensation costs
        2,000,000   -3,000,000 2,000,000 8,000,000 2,000,000 -22,000,000 1,000,000 -3,000,000 -8,000,000 -1,000,000 -3,000,000 4,000,000 -10,000,000 1,000,000 -1,000,000 1,000,000   -7,000,000 -5,000,000 3,000,000 -4,000,000 -3,000,000 -11,000,000 -2,000,000                     
          payroll taxes liabilities and other payroll withholdings
          2,000,000 -4,000,000 -10,000,000                                             
          operating lease liabilities
        -2,000,000 -2,000,000 -4,000,000 -4,000,000 -3,000,000 -4,000,000 -4,000,000 -3,000,000 -4,000,000 -4,000,000 -5,000,000 -4,000,000 -4,000,000 -4,000,000 -5,000,000 -4,000,000 -4,000,000 -3,000,000 -4,000,000 -3,000,000 -3,000,000 -4,000,000 -5,000,000 -5,000,000 -5,000,000 -4,000,000 -4,000,000 -5,000,000 -4,000,000                     
          net cash from operating activities
        149,000,000 61,000,000 72,000,000 75,000,000 95,000,000 555,000,000 -31,000,000 -123,000,000 -122,000,000 588,000,000 -110,000,000 144,000,000 -77,000,000 486,000,000 -49,000,000 -89,000,000 214,000,000 234,000,000 174,000,000 -15,000,000 -175,000,000 586,000,000 90,000,000 152,000,000 -282,000,000 682,000,000 -49,000,000 -20,000,000 -142,000,000 372,000,000 67,000,000 -7,000,000 -536,000,000 94,049,000 54,838,000 28,209,000 75,904,000 66,424,000 35,144,000 2,066,000 40,898,000 26,078,000 59,343,000 31,060,000 14,118,000 54,857,000 45,324,000 23,320,000 30,337,000 
          capital expenditures
        -20,000,000 -18,000,000 -17,000,000 -16,000,000 -15,000,000 -25,000,000 -1,000,000 -15,000,000 2,000,000 -23,000,000 -17,000,000 -12,000,000 -1,000,000 -13,000,000 -15,000,000 -11,000,000 -11,000,000 -11,000,000 -13,000,000 -2,000,000 -8,000,000 -10,000,000 -11,000,000 -5,000,000 -13,000,000 -13,000,000 -10,000,000 -7,000,000 -9,000,000 -7,000,000 -14,000,000 -10,000,000 -450,000 -7,615,000 -10,643,000 -8,502,000 -12,248,000 -11,446,000 -9,761,000 -5,372,000 -3,534,000 -48,000 -918,000 1,034,000 464,000 -3,144,000 3,338,000 632,000 
          free cash flows
        129,000,000 43,000,000 55,000,000 59,000,000 80,000,000 555,000,000 -56,000,000 -124,000,000 -137,000,000 590,000,000 -133,000,000 127,000,000 -89,000,000 485,000,000 -62,000,000 -104,000,000 203,000,000 223,000,000 163,000,000 -28,000,000 -177,000,000 578,000,000 80,000,000 141,000,000 -287,000,000 669,000,000 -62,000,000 -30,000,000 -149,000,000 363,000,000 60,000,000 -21,000,000 -546,000,000 93,599,000 47,223,000 17,566,000 67,402,000 54,176,000 23,698,000 -7,695,000 35,526,000 22,544,000 59,295,000 30,142,000 15,152,000 55,321,000 42,180,000 26,658,000 30,969,000 
          investing activities
                                                         
          purchases of marketable securities
        -25,000,000 -19,000,000 -18,000,000 -14,000,000 -27,000,000 -29,000,000 -22,000,000 -44,000,000 -95,000,000 -50,000,000 -56,000,000 -88,000,000 -82,000,000 -73,000,000 -180,000,000 -66,000,000 -91,000,000 -96,000,000 -81,000,000 -185,000,000 -82,000,000 -49,000,000 -56,000,000 -67,000,000 -155,000,000 -193,000,000 -44,000,000 -35,000,000 -30,000,000 -35,000,000 -20,000,000                   
          proceeds from sale and maturity of marketable securities
        38,000,000 21,000,000 15,000,000 33,000,000 34,000,000 225,000,000 71,000,000 59,000,000 66,000,000 63,000,000 50,000,000 97,000,000 76,000,000 79,000,000 215,000,000 103,000,000 72,000,000 117,000,000 83,000,000 65,000,000 84,000,000     46,000,000 48,000,000 34,000,000 31,000,000                     
          acquisitions of property and equipment and software
        -26,000,000 -18,000,000 -17,000,000 -18,000,000 -16,000,000  -25,000,000                                           
          proceeds from sale of business
         1,000,000                                             
          net cash from investing activities
        -13,000,000 -16,000,000 -20,000,000 1,000,000 -8,000,000 178,000,000 24,000,000 -2,000,000 -47,000,000 -13,000,000 -26,000,000 -8,000,000 -23,000,000 -21,000,000 -14,000,000 22,000,000 -213,000,000 10,000,000 -10,000,000 -132,000,000 -3,000,000 -30,000,000 -27,000,000 -94,000,000 -158,000,000 -5,000,000 -14,000,000 -11,000,000 -31,000,000 -3,000,000 -168,000,000 2,000,000 -9,237,000 -5,507,000 -2,408,000 -6,848,000 -9,711,000 -10,436,000 -1,368,000 -5,607,000 -4,478,000        
          financing activities
                                                         
          change in wse and trinet trust related assets and liabilities
        -571,000,000 584,000,000 7,000,000 78,000,000 -388,000,000                                             
          repurchase of common stock
        -58,000,000 -61,000,000 -31,000,000 -1,000,000 -90,000,000 -28,000,000 -20,000,000 -112,000,000 -23,000,000 -13,000,000 -1,011,000,000 -7,000,000 -91,000,000 -140,000,000 -1,000,000 -32,000,000 -350,000,000 -20,000,000 -14,000,000 -60,000,000 -43,000,000 -35,000,000 -60,000,000 -40,000,000 -56,000,000 -22,000,000 -24,000,000 -38,000,000 -14,000,000 -17,000,000 -22,000,000 -8,000,000 -4,653,000 -9,837,000 -1,915,000 -27,595,000 -27,857,000 -27,288,000   576,000        
          awards effectively repurchased for required employee withholding taxes
        -3,000,000 -4,000,000 -4,000,000 -4,000,000 -4,000,000 -10,000,000 -6,000,000 -5,000,000 -7,000,000 -16,000,000 -5,000,000 -5,000,000 -4,000,000 -9,000,000 -7,000,000 -5,000,000 -3,000,000 -13,000,000 -4,000,000 -4,000,000 -5,000,000 -7,000,000 -5,000,000 -3,000,000 -3,000,000 -11,000,000 -4,000,000 -6,000,000 -4,000,000 -7,000,000 -5,000,000 -6,000,000 -4,000,000 -2,900,000 -3,593,000 -2,520,000 -1,987,000 -1,473,000 -1,187,000 -829,000 -656,000         
          dividends paid
        -13,000,000 -13,000,000 -13,000,000 -14,000,000 -12,000,000 -12,000,000 -12,000,000                                           
          net cash from financing activities
        -645,000,000 511,000,000 -132,000,000 66,000,000 -494,000,000 10,000,000 -39,000,000 -148,000,000 -30,000,000 -23,000,000 -423,000,000 -300,000,000 200,000,000 -144,000,000 -7,000,000 -32,000,000 -353,000,000 -8,000,000 -23,000,000 -13,000,000 56,000,000 -285,000,000 -45,000,000 -63,000,000 185,000,000 -67,000,000 -32,000,000 -30,000,000 -47,000,000 -23,000,000 -26,000,000 -17,000,000 -19,000,000 -11,937,000 -19,922,000 -8,089,000 -37,052,000 -32,964,000 -30,880,000 -29,836,000 -5,691,000 -1,655,000       4,014,000 
          effect of exchange rate changes on cash and cash equivalents
        -1,000,000                                  235,000 117,000 46,000 -303,000 66,000 -136,000 160,000 -82,000        
          net change in cash and cash equivalents, unrestricted and restricted
        -510,000,000  -80,000,000 142,000,000 -407,000,000  -46,000,000 -273,000,000 -199,000,000                                         
          cash and cash equivalents, unrestricted and restricted:
                                                         
          beginning of period
        1,902,000,000 1,691,000,000 1,466,000,000 1,537,000,000 1,738,000,000 1,643,000,000 1,456,000,000 1,349,000,000 1,738,000,000                 
          end of period
        1,392,000,000 556,000,000 -80,000,000 142,000,000 1,284,000,000 743,000,000 -46,000,000 -273,000,000 1,267,000,000 552,000,000 -559,000,000 -164,000,000 1,637,000,000 320,000,000 -70,000,000 -99,000,000 1,386,000,000 236,000,000 141,000,000 -160,000,000 1,521,000,000 301,000,000 15,000,000 62,000,000 1,265,000,000 457,000,000 -86,000,000 -64,000,000 1,149,000,000 318,000,000 38,000,000 -192,000,000 1,185,000,000                 
          supplemental disclosures of cash flow information
                                                         
          interest paid
        24,000,000 1,000,000 24,000,000 2,000,000 25,000,000 4,000,000 25,000,000 4,000,000 26,000,000 4,000,000 9,000,000 1,000,000 11,000,000 9,000,000 9,000,000 1,000,000 9,000,000 2,000,000 5,000,000 4,000,000 4,000,000 3,000,000 4,000,000 6,000,000 5,000,000 4,000,000 4,000,000 5,000,000 4,000,000 4,000,000 3,814,000 4,180,000 3,844,000 4,162,000             
          supplemental schedule of noncash investing and financing activities
                                                         
          cash dividend declared, but not yet paid
        13,000,000 13,000,000 -1,000,000 13,000,000                                         
          payable for purchase of property and equipment
        6,000,000 2,000,000 1,000,000 -1,000,000 3,000,000 2,000,000 -3,000,000 5,000,000 -1,000,000     1,000,000 -1,000,000 3,000,000 1,000,000 -1,000,000 1,000,000 1,000,000 -2,000,000 -4,000,000 3,000,000 5,000,000 1,000,000 2,000,000 -450,000 870,000 -391,000 1,971,000 -540,000 -218,000 146,000 1,435,000 276,000 -48,000 -918,000 1,034,000 464,000 -3,144,000 3,338,000 632,000 
          receivable from sale of business
         6,000,000                                             
          impairment of intangibles and other
                                                         
          other payroll assets
             505,000,000 -83,000,000 -9,000,000 -410,000,000 -155,000,000 -172,000,000 248,000,000 -180,000,000                                     
          client deposits and other client liabilities
         -2,000,000   17,000,000 -32,000,000 19,000,000 -14,000,000 -7,000,000 -6,000,000 -52,000,000 25,000,000 52,000,000 -20,000,000 -51,000,000 28,000,000 -23,000,000 -12,000,000 -19,000,000 17,000,000 -76,000,000 61,000,000                           
          payroll taxes payable and other payroll withholdings
             15,000,000 -1,000,000 -190,000,000 173,000,000 634,000,000 -42,000,000 -161,000,000 -80,000,000 410,000,000 80,000,000 -141,000,000 -191,000,000 362,000,000 -5,000,000 -97,000,000 -426,000,000 661,000,000 8,000,000 -141,000,000 -334,000,000 512,000,000 -84,000,000 -76,000,000 -180,000,000                     
          other investments
                                                         
          proceeds from issuance of common stock
         5,000,000 -1,000,000   6,000,000 -1,000,000   6,000,000 2,000,000   5,000,000 1,000,000   5,000,000 1,000,000   5,000,000      1,000,000                    218,859,000 
          payment of long-term financing costs and debt issuance costs
                                                         
          proceeds from issuance of 2031 notes
                                                        
          proceeds from revolving credit agreement borrowings
                            234,000,000                         
          repayment of revolving credit agreement borrowings
                                                       
          net increase in cash and cash equivalents, unrestricted and restricted
                    100,000,000                    -553,000,000                 
          income taxes paid
         1,000,000   9,000,000 5,000,000 55,000,000 7,000,000 25,000,000 31,000,000       46,000,000 38,000,000 43,000,000 2,000,000 40,000,000 77,000,000 5,000,000 1,000,000 14,000,000 15,000,000 32,000,000 1,000,000 16,000,000 9,000,000                   
          loss from disposition of assets
           1,000,000                                             
          losses on investments
            1,000,000                                             
          accretion of discount rate on lease liabilities
                         1,000,000 1,000,000 1,000,000                           
          provision for doubtful accounts
                1,000,000 1,000,000   1,000,000 1,000,000                                    
          losses from disposition of assets
                                                         
          losses and impairment on investments
                                                         
          impairment of intangibles
                                                         
          accounts payable and other current liabilities
                         14,000,000 -10,000,000 -4,000,000 33,000,000 9,000,000 -59,000,000 40,000,000 29,000,000 1,000,000 -5,000,000 -20,000,000 9,000,000 1,000,000 5,000,000 1,000,000 -15,000,000                 
          other liabilities
                         1,000,000 1,000,000 -4,000,000 8,000,000 1,000,000 2,000,000 1,000,000 -11,000,000 1,000,000 -3,000,000            15,205,000 -15,936,000 21,887,000 16,422,000 9,110,000 7,926,000 10,451,000 6,876,000 4,869,000 
          acquisitions of property and equipment and projects in process
                -18,000,000                                         
          acquisitions of subsidiaries, net of cash acquired
                                                         
          repayment of borrowings under revolving credit agreement
                                                         
          acquisitions of subsidiaries paid in stock
                                                         
          unbilled revenue
              -26,000,000 -18,000,000 -20,000,000 -43,000,000 -41,000,000 7,000,000 5,000,000 -13,000,000 -54,000,000 9,000,000 7,000,000 -19,000,000 41,000,000 -6,000,000 -94,000,000 129,000,000 -23,000,000 28,000,000 -95,000,000 80,000,000 -25,000,000 -27,000,000 -9,000,000                     
          revolver repayment
                   -295,000,000 -200,000,000                                     
          payment of long-term financing fees and debt issuance costs
                                                         
          proceeds from issuance of 2029 notes
                         500,000,000                             
          repayment of borrowings
                                                         
          acquisitions of property and equipment
                  -20,000,000 -17,000,000 -17,000,000     -11,000,000 -12,000,000 -12,000,000 -5,000,000 -9,000,000 -9,000,000 -12,000,000 -6,000,000 -11,000,000 -9,000,000 -13,000,000 -12,000,000 -10,000,000 -7,000,000 -14,000,000 -12,000,000  -8,485,000 -10,252,000 -10,473,000             
          acquisition of subsidiary, net of cash acquired
                                                         
          repayment of borrowings under revolving credit facility
                                                         
          net decrease in cash and cash equivalents, unrestricted and restricted
                  -559,000,000    -70,000,000 -99,000,000 -352,000,000  141,000,000 -160,000,000 -122,000,000  15,000,000 62,000,000 -191,000,000      38,000,000                   
          other assets and prepaid expenses
                   -24,000,000  -66,000,000 -6,000,000 -11,000,000                                 
          revolver drawdown
                   495,000,000                                     
          depreciation and amortization
                    30,000,000 29,000,000 26,000,000 25,000,000 21,000,000 19,000,000 18,000,000 26,000,000 19,000,000 18,000,000 17,000,000 17,000,000 15,000,000 16,000,000 14,000,000 9,000,000 18,000,000 10,000,000 12,000,000 14,000,000 10,000,000 8,823,000 9,681,000 8,373,000 8,123,000 11,365,000 9,891,000 9,173,000 8,746,000 10,258,000 14,257,000 13,561,000 14,741,000 16,649,000 28,684,000 17,042,000 22,028,000 
          income taxes (refund) paid
                    4,000,000  23,000,000 49,000,000 -12,000,000                                 
          amortization of (premium) discount on investments
                                                         
          payment of long-term financing costs
                                                         
          draw down from revolving credit facility
                                                         
          amortization of rou asset, lease modification and impairment
                      9,000,000 3,000,000 3,000,000                                 
          loss from sales and impairments of investments
                                                         
          loss from dispositions of assets
                                                         
          purchases of property and equipment
                      -13,000,000 -15,000,000 -11,000,000                                 
          acquisition of subsidiaries, net of cash acquired
                                                         
          repayment of debt
                          -370,000,000 -6,000,000 -5,000,000 -5,000,000 -6,000,000 -5,000,000 -6,000,000 -5,000,000 -6,000,000                     
          payable for acquisition of subsidiaries
                                                         
          acquisition of zenefits, net of cash acquired
                       -183,000,000                                 
          payment of debt issuance costs
                         -7,000,000                            
          amortization of rou
                          2,000,000 3,000,000 3,000,000  4,000,000                           
          lease modification and impairment
                                                         
          amortization of premium of investments
                          1,000,000 1,000,000                             
          payment of long-term financing fees
                          -2,000,000                             
          amortization of rou asset
                                                         
          amortization of (premium) discount of investments
                                                         
          proceeds from issuance of notes payable
                                                       
          payments for extinguishment of debt
                                                      
          proceeds from sales and maturities of marketable securities
                              47,000,000 52,000,000 67,000,000                         
          noncash lease expense
                                4,000,000 2,000,000 4,000,000                       
          client deposits
                                -6,000,000 16,000,000 -38,000,000 29,000,000 -19,000,000                     
          proceeds from issuance of common stock from employee stock purchase plan
                                                        
          proceeds from issuance of common stock from exercised options
                                                        
          net decrease in unrestricted and restricted cash and cash equivalents
                                  -86,000,000 -64,000,000 -200,000,000                     
          stock-based compensation
                                   11,000,000 9,000,000 13,000,000 12,000,000 10,000,000 9,000,000 10,594,000 7,700,000 7,499,000 6,207,000 6,328,000 6,264,000 6,508,000 7,397,000 4,932,000 4,188,000 4,883,000 3,920,000 2,409,000 3,181,000 2,923,000 2,147,000 
          proceeds from issuance of debt
                                                         
          net increase in unrestricted and restricted cash and cash equivalents
                                                         
          prepaid income taxes
                                      -1,000,000 -11,000,000 13,000,000 -5,448,000 14,783,000 12,867,000 14,798,000 -38,101,000 3,249,000   -3,080,000 3,621,000       
          prepaid expenses and other current assets
                                      -1,000,000 -14,000,000 -9,000,000 1,961,000 1,640,000 -4,302,000 1,701,000 2,262,000 -220,000 -3,876,000 -1,157,000 4,514,000        
          workers' compensation collateral receivable and other noncurrent assets
                                      -4,000,000                   
          accrued corporate wages
                                      1,000,000 4,000,000 -9,000,000                 
          workers' compensation loss reserves and other noncurrent liabilities
                                                         
          worksite employee related assets
                                      -55,000,000 18,000,000 -14,000,000 -683,767,000 -42,108,000 140,753,000 242,122,000 -433,926,000 100,026,000 79,252,000 346,563,000 -506,260,000 -28,887,000 84,380,000 712,517,000  -32,768,000 -479,000 108,637,000 
          worksite employee related liabilities
                                      43,000,000 -86,000,000 -566,000,000 683,127,000 41,758,000 -140,983,000 -241,902,000 433,443,000 -100,851,000 -79,055,000 -347,039,000 507,494,000        
          proceeds from sale of marketable securities
                                      15,000,000                   
          proceeds from maturity of marketable securities
                                      9,000,000 10,000,000 14,000,000 -447,000 2,978,000 7,844,000 3,625,000             
          proceeds from issuance of common stock on exercised options
                                      1,000,000 2,000,000 3,000,000 2,322,000 3,092,000 3,487,000 2,099,000 1,688,000 1,364,000 1,716,000 504,000 702,000 1,825,000 1,440,000 3,199,000 1,047,000 515,000 137,000 494,000 
          proceeds from issuance of common stock on employee stock purchase plan
                                        2,559,000   2,202,000   2,592,000       
          repayment of notes payable
                                      -5,000,000 -10,000,000        -5,062,000 -5,063,000        
          supplemental schedule of cash and cash equivalents
                                                         
          net increase in unrestricted cash and cash equivalents
                                      35,000,000 -128,000,000 -6,000,000                 
          net decrease in restricted cash and cash equivalents
                                      3,000,000                   
          workers' compensation collateral receivable
                                        -1,000,000 1,048,000 -12,868,000 7,692,000 -2,872,000             
          workers' compensation loss reserves and other non-current liabilities
                                        -6,000,000 8,426,000 8,635,000 -13,290,000 8,229,000             
          income taxes paid (refunded)
                                          31,000 395,000 -564,000             
          net increase in restricted cash and cash equivalents
                                        -547,000,000                 
          accretion of workers' compensation and leases fair value adjustment
                                                         
          restricted cash and cash equivalents
                                         -430,000 -13,588,000 -31,105,000 -877,000             
          accounts payable
                                         16,495,000 1,503,000 4,415,000 -413,000 4,620,000 2,050,000 -3,623,000 6,111,000 -2,235,000    386,000 1,421,000 1,327,000 2,078,000 
          accrued corporate wages and other current liabilities
                                         8,669,000 -5,968,000 -3,604,000 11,903,000 -1,301,000 5,267,000           
          acquisitions of businesses
                                             -300,000        
          purchase of property and equipment
                                             -11,708,000 -11,228,000 -9,907,000 -6,807,000 -3,810,000        
          tax credit received for deductible ipo transaction costs
                                                         
          net increase in cash and cash equivalents
                                         72,477,000 29,644,000 17,829,000 32,050,000 23,446,000 -6,106,000 -29,274,000 29,760,000 19,863,000    36,389,000 -2,336,000 -22,313,000 28,245,000 
          cash and cash equivalents at beginning of year
                                                        94,356,000 
          cash and cash equivalents at end of year
                                                        122,601,000 
          income taxes paid (refund)
                                                         
          allowance for tenant improvements
                                                         
          repayment of notes and capital leases payable
                                          -9,584,000 -9,582,000 -9,569,000             
          cash and cash equivalents at beginning of period
                                          184,004,000 166,178,000 134,341,000   
          cash and cash equivalents at end of period
                                          29,644,000 17,829,000 216,054,000 23,446,000 -6,106,000 -29,274,000 195,938,000 19,863,000 17,902,000 24,012,000 104,401,000 36,389,000 -2,336,000   
          excess tax benefits received from equity incentive plan activity
                                                         
          workers' compensation loss reserves
                                                         
          proceeds from issuance of common stock, net of issuance costs
                                                     -776,000 -41,000   
          excess tax credits received from equity incentive plan activity
                                                         
          restricted cash and available for sale investments
                                                         
          workers compensation receivables
                                              -775,000 -2,911,000 -7,688,000 -142,000       3,379,000 
          workers compensation and other liabilities
                                              8,064,000           
          purchases of restricted investments
                                                        
          proceeds from maturities of restricted investments
                                              792,000           
          repayment of notes payable and capital leases
                                                         
          cash paid for interest
                                              3,560,000 4,008,000 4,083,000 3,846,000 3,572,000   6,389,000 2,255,000 14,314,000 9,093,000 
          cash paid for income taxes
                                              6,276,000 18,802,000 2,572,000 538,000 -38,000       
          excess tax benefit from equity incentive plan activity
                                                 -343,000 -38,000,000 4,820,000 12,853,000   1,276,000 1,753,000 
          restricted cash and investments
                                               -17,839,000 -3,202,000 3,207,000        
          repayment of notes payable and borrowings under capital leases
                                                         
          excess tax (benefit) deficiency from equity incentive plan activity
                                                467,000         
          income taxes payable/receivable
                                                6,735,000         
          other current liabilities
                                                -2,505,000 -3,487,000    -3,572,000   1,532,000 
          maturity of debt securities
                                                1,500,000         
          excess tax benefit (deficiency) from equity incentive plan activity
                                                -467,000         
          repayments under capital leases
                                                -10,000 -6,000        
          accretion of workers compensation and leases fair value adjustment
                                                 -116,000        
          purchase of debt securities
                                                 -26,950,000        
          proceeds from maturity of debt securities
                                                 26,282,000        
          realized tax benefit of deductible ipo transaction costs
                                                        
          borrowings under notes payable
                                                         
          payments of special dividend
                                                         
          restricted cash
                                                         
          income tax payable/receivable
                                                    29,153,000     
          cash received for income taxes
                                                    4,357,000     
          acquisition of businesses
                                                         
          proceeds from sale and maturity of debt securities
                                                         
          proceeds from issuance of common stock for employee stock purchase plan
                                                         
          cash paid for income taxes, net of refunds
                                                      -98,000 6,715,000 4,352,000 
          borrowings under capital leases
                                                        47,000 
          special dividend payable on unvested restricted stock units
                                                        35,000