7Baggers

Gartner, Inc
(NYSE:IT) 

IT stock logo

Gartner, Inc. operates as a research and advisory company in the United States, Canada, Europe, the Middle East, Africa, and internationally. It operates through three segments: Research, Conferences, and Consulting. The Research segment offers objective insights and advice on the priorities of vari...

Founded: 1979
Full Time Employees: 16,724
Sector: Technology
Industry: Information Technology Services

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 2016-03-31 2015-12-31 2015-11-05 2015-09-30 2015-06-30 2015-05-07 2015-03-31 2014-12-31 2014-11-06 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 
                                                               
      revenues:
                                                               
      insights
    1,294,195,000 1,282,772,000 1,270,724,000 1,319,453,000                                                        
      conferences
    78,325,000 286,185,000 74,554,000 211,407,000 72,597,000 251,295,000 75,776,000 186,084,000 70,069,000 214,425,000 57,200,000 168,897,000 64,642,000 188,363,000 77,031,000 113,525,000 10,354,000 107,053,000 24,415,000 58,179,000 24,802,000 93,215,000 12,738,000 317,000 13,870,000 217,477,000 66,286,000 141,174,000 51,932,000                               
      consulting
    119,129,000 133,626,000 123,573,000 155,594,000 139,706,000 153,246,000 127,622,000 142,984,000 134,685,000 128,462,000 132,845,000 126,403,000 127,036,000 138,095,000 107,014,000 120,667,000 116,006,000 117,972,000 94,743,000 105,902,000 99,504,000 93,991,000 89,161,000 97,489,000 95,730,000 103,895,000 93,218,000 103,653,000 93,138,000 95,561,000 78,752,000 96,458,000 82,896,000 85,257,000 72,117,000 91,693,000 85,248,000 88,124,000 79,082,000 94,068,000 84,940,000 87,921,000 74,686,000 74,686,000 88,336,000 76,792,000 76,792,000 88,337,000 82,300,000 82,300,000 93,488,000 84,271,000 85,547,000 70,149,000 85,928,000 72,633,000 81,923,000 71,731,000 76,676,000 
      other
    19,392,000 49,987,000 55,221,000                            11,593,000 23,311,000                            
      total revenues
    1,511,041,000 1,752,570,000 1,524,072,000 1,686,454,000 1,534,130,000 1,715,119,000 1,484,306,000 1,595,060,000 1,472,926,000 1,586,118,000 1,408,784,000 1,503,185,000 1,408,869,000 1,504,717,000 1,331,868,000 1,376,521,000 1,262,740,000 1,306,323,000 1,156,282,000 1,167,319,000 1,104,038,000 1,112,759,000 994,618,000 973,135,000 1,018,891,000 1,203,493,000 1,000,502,000 1,070,882,000 970,444,000 1,088,879,000 921,674,000 1,001,336,000 963,565,000 1,014,509,000 828,085,000 843,731,000 625,169,000 703,217,000 574,059,000 609,998,000 557,266,000 643,768,000 500,166,000 500,166,000 547,936,000 471,186,000 471,186,000 583,979,000 470,940,000 470,940,000 519,820,000 446,702,000 520,707,000 410,705,000 446,047,000 406,754,000 474,749,000 374,406,000 397,482,000 
      yoy
    -1.51% 2.18% 2.68% 5.73% 4.16% 8.13% 5.36% 6.11% 4.55% 5.41% 5.78% 9.20% 11.57% 15.19% 15.19% 17.92% 14.37% 17.39% 16.25% 19.95% 8.36% -7.54% -0.59% -9.13% 4.99% 10.53% 8.55% 6.95% 0.71% 7.33% 11.30% 18.68% 54.13% 44.27% 44.25% 38.32% 12.19% 9.23% 14.77% 21.96% 1.70% 36.63% 6.15% -14.35% 16.35% 0.05% -9.36% 30.73% -9.56% 14.67% 16.54% 9.82% 9.68% 9.70% 12.22%     
      qoq
    -13.78% 14.99% -9.63% 9.93% -10.55% 15.55% -6.94% 8.29% -7.14% 12.59% -6.28% 6.69% -6.37% 12.98% -3.24% 9.01% -3.34% 12.98% -0.95% 5.73% -0.78% 11.88% 2.21% -4.49% -15.34% 20.29% -6.57% 10.35% -10.88% 18.14% -7.96% 3.92% -5.02% 22.51% -1.85% 34.96% -11.10% 22.50% -5.89% 9.46% -13.44% 28.71% 0.00% -8.72% 16.29% 0.00% -19.31% 24.00% 0.00% -9.40% 16.37% -14.21% 26.78% -7.92% 9.66% -14.32% 26.80% -5.81%  
      costs and expenses:
                                                               
      cost of services and product development
    429,307,000 572,596,000 474,218,000 531,731,000 475,030,000 574,925,000 475,342,000 513,314,000 459,441,000 529,842,000 450,841,000 487,418,000 435,139,000 475,366,000 416,837,000 424,535,000 377,033,000 399,587,000 359,237,000 350,802,000 334,467,000 351,428,000 329,767,000 322,551,000 341,278,000 450,868,000 365,056,000 387,999,000 346,645,000 407,842,000 336,112,000 367,637,000 357,209,000 398,378,000 332,207,000 352,004,000 237,609,000 279,063,000 223,122,000 231,422,000 212,041,000 257,217,000 193,602,000 193,602,000 210,495,000 177,762,000 177,762,000 235,875,000 188,059,000 188,059,000 203,178,000 170,821,000 210,108,000 161,735,000 177,904,000 163,737,000 200,214,000 151,143,000 161,247,000 
      gross profit
    1,081,734,000 1,179,974,000 1,049,854,000 1,154,723,000 1,059,100,000 1,140,194,000 1,008,964,000 1,081,746,000 1,013,485,000 1,056,276,000 957,943,000 1,015,767,000 973,730,000 1,029,351,000 915,031,000 951,986,000 885,707,000 906,736,000 797,045,000 816,517,000 769,571,000 761,331,000 664,851,000 650,584,000 677,613,000 752,625,000 635,446,000 682,883,000 623,799,000 681,037,000 585,562,000 633,699,000 606,356,000 616,131,000 495,878,000 491,727,000 387,560,000 424,154,000 350,937,000 378,576,000 345,225,000 386,551,000 306,564,000 306,564,000 337,441,000 293,424,000 293,424,000 348,104,000 282,881,000 282,881,000 316,642,000 275,881,000 310,599,000 248,970,000 268,143,000 243,017,000 274,535,000 223,263,000 236,235,000 
      yoy
    2.14% 3.49% 4.05% 6.75% 4.50% 7.94% 5.33% 6.50% 4.08% 2.62% 4.69% 6.70% 9.94% 13.52% 14.80% 16.59% 15.09% 19.10% 19.88% 25.51% 13.57% 1.16% 4.63% -4.73% 8.63% 10.51% 8.52% 7.76% 2.88% 10.53% 18.09% 28.87% 56.45% 45.26% 41.30% 29.89% 12.26% 9.73% 14.47% 23.49% 2.31% 31.74% 4.48% -11.93% 19.29% 3.73% -7.33% 26.18% -8.92% 13.62% 18.09% 13.52% 13.14% 11.51% 13.51%     
      qoq
    -8.33% 12.39% -9.08% 9.03% -7.11% 13.01% -6.73% 6.74% -4.05% 10.27% -5.69% 4.32% -5.40% 12.49% -3.88% 7.48% -2.32% 13.76% -2.38% 6.10% 1.08% 14.51% 2.19% -3.99% -9.97% 18.44% -6.95% 9.47% -8.40% 16.30% -7.60% 4.51% -1.59% 24.25% 0.84% 26.88% -8.63% 20.86% -7.30% 9.66% -10.69% 26.09% 0.00% -9.15% 15.00% 0.00% -15.71% 23.06% 0.00% -10.66% 14.77% -11.18% 24.75% -7.15% 10.34% -11.48% 22.96% -5.49%  
      gross margin %
    71.59% 67.33% 68.88% 68.47% 69.04% 66.48% 67.98% 67.82% 68.81% 66.60% 68.00% 67.57% 69.11% 68.41% 68.70% 69.16% 70.14% 69.41% 68.93% 69.95% 69.71% 68.42% 66.84% 66.85% 66.50% 62.54% 63.51% 63.77% 64.28% 62.54% 63.53% 63.29% 62.93% 60.73% 59.88% 58.28% 61.99% 60.32% 61.13% 62.06% 61.95% 60.05% 61.29% 61.29% 61.58% 62.27% 62.27% 59.61% 60.07% 60.07% 60.91% 61.76% 59.65% 60.62% 60.12% 59.75% 57.83% 59.63% 59.43% 
      selling, general and administrative
    726,349,000 797,878,000 762,557,000 776,888,000 730,308,000 771,181,000 711,729,000 712,071,000 689,833,000 703,757,000 660,527,000 680,168,000 657,090,000 645,098,000 613,031,000 604,911,000 617,904,000 667,334,000 512,573,000 488,496,000 487,255,000 525,976,000 521,508,000 494,840,000 496,639,000 557,519,000 512,159,000 514,976,000 518,770,000 488,056,000 447,537,000 460,803,000 487,745,000 465,371,000 421,163,000 408,226,000 304,244,000 289,862,000 269,902,000 272,009,000 257,411,000 258,809,000 236,355,000 236,355,000 237,991,000 229,522,000 229,522,000 235,888,000 217,025,000 217,025,000 218,537,000 204,617,000 212,805,000 181,546,000 185,629,000 180,478,000 186,216,000 164,888,000 165,221,000 
      depreciation
    25,365,000 27,881,000 30,733,000 30,535,000 28,866,000 29,090,000 29,082,000 27,594,000 26,317,000 26,490,000 24,547,000 23,712,000 23,896,000 24,417,000 22,882,000 22,910,000 23,201,000 25,830,000 25,371,000 25,851,000 25,750,000 25,937,000 22,743,000 22,728,000 22,517,000 21,488,000 20,704,000 20,099,000 19,775,000 18,136,000 17,335,000 16,711,000 16,410,000 18,260,000 17,340,000 18,057,000 10,240,000 9,782,000 9,531,000 9,025,000 8,834,000 8,850,000 8,510,000 8,510,000 8,440,000 7,989,000 7,989,000 8,061,000 7,945,000 7,945,000 7,721,000 7,459,000 7,621,000 7,258,000 7,017,000 7,100,000 6,991,000 6,301,000 6,182,000 
      amortization of intangibles
    20,066,000 19,976,000 20,220,000 20,204,000 21,894,000 22,132,000 22,170,000 22,940,000 22,990,000 22,833,000 23,989,000 22,901,000 22,735,000 24,265,000 24,369,000 24,754,000 25,148,000 25,826,000 27,109,000 26,154,000 30,514,000 30,444,000 31,228,000 31,208,000 32,179,000 32,172,000 31,694,000 32,164,000 33,683,000 34,384,000 50,852,000 50,127,000 51,646,000 53,260,000 51,224,000 65,500,000 6,290,000 6,183,000 6,221,000 6,210,000 6,183,000 6,359,000 2,737,000 2,737,000 2,107,000 2,139,000 2,139,000 2,463,000 2,505,000 2,505,000 1,979,000 1,279,000 1,357,000 1,351,000 1,404,000 1,334,000 1,373,000 1,362,000 928,000 
      gain from sale of divested operation
    -6,138,000           3,906,000 -139,316,000                                               
      total costs and expenses
    1,194,949,000 1,418,331,000 1,437,728,000 1,359,358,000 1,256,098,000 1,397,324,000 1,238,482,000 1,276,277,000 1,199,041,000 1,284,705,000 1,164,367,000 1,220,078,000 1,000,912,000 1,172,398,000 1,078,450,000 1,079,399,000 1,045,493,000 1,120,919,000 926,061,000 892,605,000 878,626,000 934,629,000 906,968,000 873,484,000 894,173,000 1,067,354,000 931,355,000 954,880,000 921,645,000 959,273,000 868,950,000 915,240,000 972,276,000 951,615,000 852,434,000 942,119,000 571,655,000 594,530,000 525,333,000 526,699,000 492,837,000 542,147,000 447,692,000 447,692,000 462,716,000 422,504,000 422,504,000 488,139,000 421,549,000 421,549,000 438,059,000 387,532,000 431,950,000 351,962,000 372,060,000 352,749,000 395,088,000 324,638,000 334,760,000 
      operating income
    316,092,000 334,239,000 86,344,000 327,096,000 278,032,000 317,795,000 245,824,000 318,783,000 273,885,000 301,413,000 244,417,000 283,107,000 407,957,000 332,319,000 253,418,000 297,122,000 217,247,000 185,404,000 230,221,000 274,714,000 225,412,000 178,130,000 87,650,000 99,651,000 124,718,000 136,139,000 69,147,000 116,002,000 48,799,000 129,606,000 52,724,000 86,096,000 -8,711,000 62,894,000 -24,349,000 -98,388,000 53,514,000 108,687,000 48,726,000 83,299,000 64,429,000 101,621,000 52,474,000 52,474,000 85,220,000 48,682,000 48,682,000 95,840,000 49,391,000 49,391,000 81,761,000 59,170,000 88,757,000 58,743,000 73,987,000 54,005,000 79,661,000 49,768,000 62,722,000 
      yoy
    13.69% 5.17% -64.88% 2.61% 1.51% 5.44% 0.58% 12.60% -32.86% -9.30% -3.55% -4.72% 87.78% 79.24% 10.08% 8.16% -3.62% 4.08% 162.66% 175.68% 80.74% 30.84% 26.76% -14.10% 155.57% 5.04% 31.15% 34.74% -660.20% 106.07% -316.53% -187.51% -116.28% -42.13% -149.97% -218.11% -16.94% 6.95% -7.14% 58.74% -24.40% 108.74% 7.79% -45.25% 72.54% -1.44% -40.46% 61.97% -44.35% -15.92% 10.51% 9.56% 11.42% 18.03% 17.96%     
      qoq
    -5.43% 287.10% -73.60% 17.65% -12.51% 29.28% -22.89% 16.39% -9.13% 23.32% -13.67% -30.60% 22.76% 31.13% -14.71% 36.77% 17.17% -19.47% -16.20% 21.87% 26.54% 103.23% -12.04% -20.10% -8.39% 96.88% -40.39% 137.71% -62.35% 145.82% -38.76% -1088.36% -113.85% -358.30% -75.25% -283.85% -50.76% 123.06% -41.50% 29.29% -36.60% 93.66% 0.00% -38.43% 75.05% 0.00% -49.20% 94.04% 0.00% -39.59% 38.18% -33.33% 51.09% -20.60% 37.00% -32.21% 60.06% -20.65%  
      operating margin %
    20.92% 19.07% 5.67% 19.40% 18.12% 18.53% 16.56% 19.99% 18.59% 19.00% 17.35% 18.83% 28.96% 22.09% 19.03% 21.58% 17.20% 14.19% 19.91% 23.53% 20.42% 16.01% 8.81% 10.24% 12.24% 11.31% 6.91% 10.83% 5.03% 11.90% 5.72% 8.60% -0.90% 6.20% -2.94% -11.66% 8.56% 15.46% 8.49% 13.66% 11.56% 15.79% 10.49% 10.49% 15.55% 10.33% 10.33% 16.41% 10.49% 10.49% 15.73% 13.25% 17.05% 14.30% 16.59% 13.28% 16.78% 13.29% 15.78% 
      interest expense
    -21,048,000 -83,784,000 -16,279,000 -11,801,000 -13,413,000 -73,876,000 -17,961,000 -19,990,000 -19,219,000 -59,003,000 -21,820,000 -24,558,000 -27,391,000 -34,804,000 -30,286,000 -29,719,000 -31,394,000 -33,375,000 -31,599,000 -27,390,000 -26,149,000 -28,454,000 -30,538,000 -30,296,000 -26,349,000 -29,162,000 -24,073,000 -24,749,000 -24,847,000 -27,127,000 -26,984,000 -37,604,000 -35,059,000 -39,323,000 -38,762,000 -43,956,000 -5,906,000 -8,271,000 -5,932,000 -7,356,000 -6,006,000 -7,779,000 -6,049,000 -6,049,000 -5,240,000 -3,480,000 -3,480,000 -4,714,000 -2,656,000 -2,656,000 -2,680,000 -2,250,000 -3,684,000 -2,124,000 -2,144,000 -2,436,000 -3,348,000 -2,209,000 -2,153,000 
      other income
    -2,632,000 -1,336,000 -583,000 2,498,000 2,389,000 -3,829,000 -991,000 504,000 4,891,000 -3,682,000 1,877,000 5,575,000 -2,366,000 1,728,000 8,930,000 8,548,000 29,206,000 6,410,000 211,000 -3,682,000 15,490,000 4,392,000 1,869,000   579,000 8,024,000 -247,000 -824,000 -1,026,000 -827,000 1,120,000 899,000 1,795,000 1,171,000 -407,000 889,000 3,320,000 1,954,000 1,248,000 1,884,000 1,059,000 5,367,000 5,367,000 -468,000 -962,000 -962,000 -251,000 -287,000 -287,000 175,000 -229,000 -16,000 5,000 -280,000 211,000 550,000 -748,000 -76,000 
      income before income taxes
    292,412,000 313,835,000 69,482,000 317,793,000 267,008,000 301,648,000 526,872,000 299,297,000 259,557,000 277,254,000 224,474,000 264,124,000 381,277,000 304,123,000 232,062,000 275,951,000 215,059,000 177,097,000 198,833,000 379,187,000 214,753,000 156,155,000 14,167,000 58,956,000 96,854,000 110,582,000 53,098,000 91,006,000 21,053,000 110,966,000 37,953,000 75,072,000 -42,871,000 28,377,000 -61,940,000 -142,751,000 48,497,000 106,185,000 44,748,000 77,191,000 60,307,000 96,667,000 51,792,000 51,792,000 79,512,000 44,240,000 44,240,000 92,288,000 46,448,000 46,448,000 79,256,000 56,691,000 86,472,000 56,624,000 71,563,000 51,780,000 77,909,000 46,811,000 60,493,000 
      provision for income taxes
    70,068,000 71,683,000 34,125,000 77,010,000 56,069,000 -96,925,000 111,823,000 69,749,000 49,012,000 68,623,000 44,465,000 66,081,000 85,494,000 47,309,000 58,517,000 71,026,000 42,544,000 -32,262,000 49,968,000 107,951,000 50,653,000 36,548,000 -2,797,000 3,879,000 21,757,000 42,881,000 11,710,000 -12,400,000 258,000                       18,955,000        
      net income
    222,344,000 242,152,000 35,357,000 240,783,000 210,939,000 398,573,000 415,049,000 229,548,000 210,545,000 208,631,000 180,009,000 198,043,000 295,783,000 256,814,000 173,545,000 204,925,000 172,515,000 209,359,000 148,865,000 271,236,000 164,100,000 119,607,000 16,964,000 55,077,000 75,097,000 67,701,000 41,388,000 103,406,000 20,795,000 84,020,000 11,753,000 46,270,000 -19,587,000 107,307,000 -48,180,000 -92,281,000 36,433,000 66,485,000 30,484,000 47,911,000 40,167,000 65,763,000 30,366,000 30,366,000 51,155,000 28,351,000 28,351,000 59,144,000 33,846,000 33,846,000 53,040,000 37,736,000 61,418,000 38,194,000 46,514,000 36,675,000 58,823,000 31,375,000 41,484,000 
      yoy
    5.41% -39.25% -91.48% 4.89% 0.19% 91.04% 130.57% 15.91% -28.82% -18.76% 3.72% -3.36% 71.45% 22.67% 16.58% -24.45% 5.13% 75.04% 777.53% 392.47% 118.52% 76.67% -59.01% -46.74% 261.13% -19.42% 252.15% 123.48% -206.17% -21.70% -124.39% -150.14% -153.76% 61.40% -258.05% -292.61% -9.30% 1.10% 0.39% 57.78% -21.48% 131.96% 7.11% -48.66% 51.14% -16.24% -46.55% 56.73% -44.89% -11.38% 14.03% 2.89% 4.41% 21.73% 12.13%     
      qoq
    -8.18% 584.88% -85.32% 14.15% -47.08% -3.97% 80.81% 9.03% 0.92% 15.90% -9.11% -33.04% 15.17% 47.98% -15.31% 18.79% -17.60% 40.64% -45.12% 65.29% 37.20% 605.06% -69.20% -26.66% 10.92% 63.58% -59.98% 397.26% -75.25% 614.88% -74.60% -336.23% -118.25% -322.72% -47.79% -353.29% -45.20% 118.10% -36.37% 19.28% -38.92% 116.57% 0.00% -40.64% 80.43% 0.00% -52.06% 74.74% 0.00% -36.19% 40.56% -38.56% 60.81% -17.89% 26.83% -37.65% 87.48% -24.37%  
      net income margin %
    14.71% 13.82% 2.32% 14.28% 13.75% 23.24% 27.96% 14.39% 14.29% 13.15% 12.78% 13.17% 20.99% 17.07% 13.03% 14.89% 13.66% 16.03% 12.87% 23.24% 14.86% 10.75% 1.71% 5.66% 7.37% 5.63% 4.14% 9.66% 2.14% 7.72% 1.28% 4.62% -2.03% 10.58% -5.82% -10.94% 5.83% 9.45% 5.31% 7.85% 7.21% 10.22% 6.07% 6.07% 9.34% 6.02% 6.02% 10.13% 7.19% 7.19% 10.20% 8.45% 11.80% 9.30% 10.43% 9.02% 12.39% 8.38% 10.44% 
      net income per share
                                                               
      basic
    3.19 3.31 0.47 3.12 2.73 5.14 5.36 2.95 2.69 2.66 2.28 2.5 3.72 3.24 2.19 2.55 2.1 2.53 1.78 3.16 1.86 1.34 0.19 0.62 0.84 0.76 0.46 1.15 0.23 0.93 0.13 0.51 -0.22 1.23 -0.53 -1.03 0.44 0.8 0.37 0.58 0.49                   
      diluted
    3.18 3.3 0.47 3.11 2.71 5.1 5.32 2.93 2.67 2.64 2.26 2.48 3.68 3.19 2.17 2.53 2.08 2.49 1.76 3.13 1.84 1.33 0.19 0.61 0.83 0.74 0.46 1.13 0.23 0.91 0.13 0.5 -0.22 1.23 -0.53 -1.03 0.43 0.79 0.36 0.57 0.48                   
      weighted-average shares outstanding:
                                                               
      basic
    69,796 75,355 74,884 77,157 77,357 77,785 77,484 77,816 78,339 79,004 78,923 79,285 79,452 80,178 79,259 80,271 82,020 85,026 83,566 85,712 88,352 89,315 89,378 89,323 89,219 89,817 89,846 90,112 89,882 90,827 90,854 91,048 91,005 88,466 90,624 89,297 82,835 82,571 82,638 82,559 82,451 83,852 82,989,000 82,989,000 83,203,000 86,539,000 86,539,000 89,337 88,513,000 88,513,000 89,521,000 91,669,000 93,015 92,689,000 93,574,000 93,595,000 93,444 93,522,000 93,350,000 
      diluted
    69,965 75,605 74,987 77,359 77,790 78,338 77,968 78,288 78,964 79,680 79,520 79,820 80,282 81,067 80,059 80,974 82,973 86,177 84,766 86,589 89,139 90,017 89,955 89,780 90,066 90,971 90,887 91,188 91,004 92,122 92,148 92,156 91,005 89,790 90,624 89,297 84,095 83,820 83,803 83,476 83,464 85,056 84,113,000 84,113,000 84,271,000 87,773,000 87,773,000 90,719 89,708,000 89,708,000 90,744,000 93,209,000 94,830 94,355,000 95,188,000 95,537,000 95,842 95,611,000 95,423,000 
      acquisition and integration charges
         -4,000 159,000 358,000 460,000 1,783,000 4,463,000 1,973,000 1,368,000 3,252,000 1,331,000 2,289,000 2,207,000 2,342,000 1,771,000 1,302,000 640,000 844,000 1,722,000 2,157,000 1,560,000 5,307,000 1,742,000 -358,000 2,772,000 10,855,000 17,114,000 19,962,000 59,266,000 16,346,000 30,500,000 98,332,000 13,272,000 9,640,000 16,557,000 8,033,000 8,368,000 10,912,000 6,488,000 6,488,000 3,683,000 5,092,000 5,092,000 5,852,000 6,015,000 6,015,000 6,644,000 3,356,000 59,000 72,000 106,000 100,000 294,000 944,000 1,182,000 
      goodwill impairment
      150,000,000                                                         
      gain on event cancellation insurance claims
          300,000,000      3,077,000     16,765,000  135,545,000                                        
      research
        1,321,827,000 1,310,578,000 1,280,908,000 1,265,992,000 1,268,172,000 1,243,231,000 1,218,739,000 1,207,885,000 1,217,191,000 1,178,259,000 1,147,823,000 1,142,329,000 1,136,380,000 1,081,298,000 1,037,124,000 1,003,238,000 979,732,000 925,553,000 892,719,000 875,329,000 909,291,000 882,121,000 840,998,000 826,055,000 825,374,000 797,338,000 774,188,000 770,314,000 763,924,000 692,799,000 653,443,000 613,732,000 504,652,000 478,778,000 461,502,000 449,170,000 440,271,000 420,499,000 396,179,000 396,179,000 385,718,000 381,090,000 381,090,000 373,395,000 365,334,000 365,334,000 358,495,000 348,114,000 332,929,000 316,518,000 311,233,000 310,331,000 300,177,000 284,048,000 278,302,000 
      loss on extinguishment of debt
                          -44,814,000                                     
      loss from divested operations
                                -2,075,000                               
      other expense
                           -10,399,000 -1,515,000                                   
      gain from divested operations
                                 6,947,000 13,040,000 25,460,000                            
      events
                                 53,620,250 57,141,000 111,253,000 46,087,000 166,476,000 44,953,000 91,205,000 35,269,000 136,315,000 33,475,000 66,760,000 32,055,000 135,348,000 29,301,000 29,301,000 73,882,000 13,304,000 13,304,000 122,247,000 23,306,000 23,306,000 67,837,000 14,317,000 102,231,000 24,038,000 48,886,000 23,790,000 92,649,000 18,627,000 42,504,000 
      benefit for income taxes
                                 26,946,000 26,200,000 28,802,000 -23,284,000 -78,930,000 -13,760,000                         
      talent assessment & other
                                    70,658,000 69,977,000 57,572,000 47,101,000                        
      (benefit from) benefit from income taxes
                                       -50,470,000                        
      benefit from income taxes
                                        12,064,000 39,700,000 14,264,000 29,280,000 20,140,000 30,904,000 21,426,000 21,426,000 28,357,000 15,889,000 15,889,000 33,144,000 12,602,000 12,602,000 26,216,000  14,646,000 18,430,000 25,049,000 15,105,000 19,086,000 15,436,000 19,009,000 
      earnings per common share:
                                                               
      basic
                                             325 370 370 610 330 330 347.5 380 380 590 410        
      diluted
                                             322.5 360 360 610 320 320 342.5 380 380 580 400        
      income per common share:
                                                               
      basic
                                                        325 410 500 390 287.5 340 440 
      diluted
                                                        320 400 490 380 280 330 430 
    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 2014-11-06 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 
                                                               
        assets
                                                               
        current assets:
                                                               
        cash and cash equivalents
      1,666,946,000 1,722,521,000 1,430,730,000 2,197,536,000 2,091,048,000 1,933,147,000 1,768,292,000 1,235,785,000 1,235,801,000 1,318,999,000 1,249,355,000 1,172,828,000 893,512,000 697,999,000 528,687,000 360,473,000 456,175,000 756,493,000 765,530,000 796,257,000 445,995,000 712,583,000 553,715,000 356,633,000 227,850,000 280,836,000 306,727,000 218,453,000 149,270,000 156,368,000 210,997,000 141,805,000 189,979,000 538,908,000 630,016,000 589,282,000 1,227,891,000 474,233,000 465,734,000 445,053,000 403,943,000 372,976,000 371,244,000 357,581,000 281,653,000 365,302,000 341,220,000 341,220,000 317,925,000 283,284,000 423,990,000 374,521,000 333,363,000 269,063,000 299,852,000 255,391,000 150,531,000 
        fees receivable, net of allowances of 5,000 for both periods
      1,411,496,000                                                         
        deferred commissions
      379,221,000 400,728,000 301,875,000 337,007,000 377,410,000 413,914,000 303,999,000 320,687,000 350,725,000 380,479,000 285,189,000 311,085,000 343,716,000 363,079,000 269,310,000 312,048,000 360,093,000 380,569,000 250,409,000 248,447,000 257,956,000 259,755,000 207,938,000 233,402,000 240,177,000 265,867,000 197,607,000 211,655,000 231,464,000 235,016,000 166,726,000 183,481,000 207,161,000 205,260,000 143,063,000 143,062,000 139,771,000 141,410,000 112,697,000 111,083,000 118,125,000 124,831,000 93,792,000 98,211,000 104,405,000 115,381,000 80,599,000 80,599,000 88,689,000 97,610,000 106,287,000 77,390,000 77,884,000 82,929,000 87,933,000 65,870,000 68,310,000 
        prepaid expenses and other current assets
      190,334,000 152,205,000 209,671,000 176,253,000 159,914,000 153,245,000 173,484,000 147,922,000 173,785,000 127,180,000 162,449,000 143,473,000 142,650,000 119,207,000 135,118,000 136,765,000 131,263,000 117,838,000 122,943,000 109,900,000 118,479,000 109,212,000 154,887,000 128,631,000 156,026,000 146,026,000 173,851,000 148,140,000 156,420,000 165,237,000 178,436,000 199,208,000 175,204,000 124,632,000 164,921,000 141,237,000 91,546,000 84,540,000 107,316,000 63,725,000 54,332,000 62,427,000 114,061,000 82,661,000 88,206,000 63,868,000 87,492,000 87,492,000 71,939,000 67,777,000 63,682,000 91,070,000 80,100,000 81,643,000 75,713,000 89,766,000 78,095,000 
        assets held-for-sale
       106,361,000            49,036,000                   603,354,000 542,965,000                        
        total current assets
      3,647,997,000 4,066,337,000 3,062,763,000 3,973,959,000 4,131,954,000 4,196,531,000 3,551,529,000 3,108,715,000 3,326,271,000 3,427,886,000 2,837,556,000 2,899,178,000 2,903,319,000 2,786,107,000 1,980,255,000 1,981,282,000 2,273,929,000 2,620,080,000 2,108,848,000 2,257,166,000 1,997,856,000 2,323,058,000 1,865,404,000 1,767,185,000 1,772,618,000 2,018,741,000 1,706,505,000 1,691,104,000 1,716,013,000 1,811,739,000 1,535,340,000 1,608,484,000 2,310,662,000 2,588,608,000 1,812,283,000 1,759,974,000 2,175,695,000 1,343,196,000 1,245,949,000 1,233,656,000 1,179,277,000 1,140,997,000 1,061,399,000 1,066,068,000 1,000,648,000 1,096,658,000 959,234,000 959,234,000 971,769,000 945,668,000 1,084,882,000 935,155,000 923,358,000 875,040,000 927,466,000 781,978,000 686,350,000 
        property, equipment and leasehold improvements
      204,839,000 214,183,000 248,946,000 253,947,000 249,462,000 242,968,000 254,101,000 258,450,000 256,536,000 262,718,000 259,890,000 258,601,000 256,863,000 264,581,000 256,176,000 250,315,000 258,364,000 273,562,000 297,020,000 309,222,000 322,610,000 336,765,000 332,891,000 343,563,000 346,579,000 344,579,000 300,612,000 291,280,000 271,448,000 267,665,000 246,061,000 225,901,000 223,086,000 221,507,000 216,021,000 197,129,000 126,419,000 121,606,000 118,789,000 117,255,000 108,628,000 108,733,000 109,557,000 107,112,000 104,374,000 97,990,000 93,625,000 93,625,000 95,831,000 94,208,000 91,759,000 90,198,000 89,415,000 88,508,000 89,089,000 80,344,000 77,795,000 
        operating lease right-of-use assets
      222,350,000 213,997,000 227,696,000 238,513,000 246,215,000 257,419,000 326,211,000 339,805,000 352,400,000 366,809,000 379,112,000 398,250,000 415,074,000 436,592,000 460,910,000 481,551,000 513,290,000 548,258,000 616,317,000 618,132,000 633,796,000 647,283,000 651,813,000 668,510,000 678,018,000 702,916,000                                
        goodwill
      2,740,264,000 2,740,802,000 2,789,923,000 2,937,706,000 2,933,122,000 2,930,205,000 2,937,780,000 2,934,222,000 2,934,398,000 2,937,260,000 2,933,266,000 2,931,821,000 2,929,941,000 2,930,211,000 2,936,140,000 2,943,257,000 2,949,321,000 2,951,317,000 2,952,927,000 2,955,466,000 2,943,500,000 2,945,547,000 2,938,708,000 2,935,609,000 2,927,666,000 2,937,726,000 2,939,707,000 2,930,297,000 2,906,736,000 2,923,136,000 2,910,849,000 2,974,513,000 2,956,642,000 2,987,294,000 3,145,046,000 3,169,893,000 855,330,000 738,453,000 742,926,000 742,752,000 718,034,000 715,359,000 723,950,000 583,002,000 579,910,000 586,665,000 593,212,000 593,212,000 598,731,000 589,786,000 519,203,000 518,555,000 516,144,000 516,525,000 519,506,000 519,200,000 515,002,000 
        intangible assets
      315,754,000 336,303,000 357,033,000 375,935,000 391,804,000 409,689,000 440,147,000 455,021,000 477,701,000 501,958,000 519,115,000 547,794,000 564,138,000 584,714,000 603,833,000 645,368,000 684,529,000 714,418,000 743,950,000 775,479,000 777,441,000 806,998,000 820,994,000 847,375,000 864,150,000 925,087,000 936,313,000 973,437,000 1,016,055,000 1,042,565,000 1,085,736,000 1,177,297,000 1,247,771,000 1,292,022,000 1,564,465,000 1,595,376,000 81,209,000 76,801,000 81,769,000 99,267,000 90,553,000 96,544,000 96,174,000 27,110,000 28,456,000 30,689,000 33,515,000 33,515,000 36,415,000 34,537,000 6,107,000 7,535,000 8,834,000 10,477,000 11,821,000 13,142,000 14,052,000 
        other assets
      524,069,000 513,778,000 562,705,000 547,727,000 527,204,000 497,859,000 335,682,000 334,496,000 362,504,000 339,288,000 315,465,000 320,289,000 309,597,000 297,531,000 288,640,000 288,821,000 306,020,000 308,689,000 275,577,000 272,875,000 262,655,000 256,316,000 230,792,000 248,052,000 211,315,000 222,245,000 201,934,000 205,822,000 170,281,000 156,369,000 166,831,000 166,742,000 176,867,000 193,742,000 273,677,000 272,515,000 126,647,000 87,279,000 88,307,000 111,591,000 115,017,000 113,053,000 100,462,000 77,747,000 75,982,000 92,349,000 89,367,000 89,367,000 94,062,000 93,514,000 81,631,000 76,955,000 76,036,000 76,845,000 73,395,000 84,484,000 86,916,000 
        total assets
      7,655,273,000 8,085,400,000 7,249,066,000 8,327,787,000 8,479,761,000 8,534,671,000 7,845,450,000 7,430,709,000 7,709,810,000 7,835,919,000 7,244,404,000 7,355,933,000 7,378,932,000 7,299,736,000 6,525,954,000 6,590,594,000 6,985,453,000 7,416,324,000 6,994,639,000 7,188,340,000 6,937,858,000 7,315,967,000 6,840,602,000 6,810,294,000 6,800,346,000 7,151,294,000 6,737,344,000 6,729,641,000 6,714,675,000 6,201,474,000 5,944,817,000 6,152,937,000 6,915,028,000 7,283,173,000 7,011,492,000 6,994,887,000 3,365,300,000 2,367,335,000 2,277,740,000 2,304,521,000 2,211,509,000 2,174,686,000 2,091,542,000 1,861,039,000 1,789,370,000 1,904,351,000 1,768,953,000 1,768,953,000 1,796,808,000 1,757,713,000 1,783,582,000 1,628,398,000 1,613,787,000 1,567,395,000 1,621,277,000 1,479,148,000 1,380,115,000 
        liabilities and stockholders’ equity
                                                               
        current liabilities:
                                                               
        accounts payable and accrued liabilities
      862,464,000 1,236,533,000 957,946,000 901,916,000 869,177,000 1,206,089,000 909,821,000 835,287,000 844,274,000 1,127,604,000 908,558,000 828,873,000 838,784,000 1,115,198,000 848,910,000 775,371,000 832,290,000 1,134,814,000 870,310,000 752,241,000 703,439,000 952,431,000 790,260,000 736,039,000 533,951,000 788,796,000 593,695,000 564,672,000 526,551,000 710,113,000 599,655,000 542,071,000 532,538,000 666,821,000 550,207,000 517,118,000 331,828,000 440,771,000 348,429,000 287,476,000 247,423,000 387,691,000 290,044,000 262,293,000 240,301,000 353,761,000 266,545,000 266,545,000 251,421,000 211,566,000 325,059,000 224,873,000 204,350,000 180,896,000 287,763,000 206,290,000 178,528,000 
        deferred revenues
      3,018,870,000 2,810,056,000 2,531,532,000 2,691,487,000 2,922,518,000 2,762,927,000 2,562,139,000 2,626,511,000 2,796,016,000 2,640,515,000 2,394,556,000 2,499,379,000 2,607,072,000 2,443,762,000 2,229,648,000 2,396,143,000 2,421,726,000 2,238,035,000 2,028,908,000 2,152,043,000 2,088,463,000 1,974,548,000 1,710,791,000 1,765,264,000 1,847,384,000 1,928,020,000 1,803,135,000 1,796,331,000 1,837,504,000 1,745,244,000 1,650,647,000 1,687,724,000 1,719,637,000 1,630,198,000 1,512,227,000 1,449,211,000 1,109,162,000 989,478,000 1,028,995,000 1,029,765,000 986,301,000 900,801,000 925,056,000 922,227,000 895,430,000 841,457,000 847,327,000 847,327,000 847,877,000 832,555,000 766,114,000 754,120,000 749,240,000 736,696,000 692,237,000 682,603,000 659,741,000 
        current portion of long-term debt
      5,000,000 5,000,000 732,000 361,000      9,600,000 9,600,000 9,000,000 8,400,000 7,800,000 7,335,000 6,868,000 6,400,000 5,931,000 5,326,000 5,322,000 20,519,000 20,515,000 20,511,000 38,019,000 149,003,000 139,718,000 130,433,000 121,148,000 204,863,000 165,578,000 93,294,000 284,009,000 789,724,000 379,721,000 419,601,000 277,578,000 29,366,000 30,000,000 40,000,000 70,000,000 57,500,000 35,000,000 20,000,000 20,000,000 285,000,000 20,000,000 245,000,000 245,000,000 246,250,000 222,500,000 68,750,000 65,000,000 61,250,000 57,500,000 90,000,000 80,000,000 70,088,000 
        liabilities held-for-sale
       20,503,000            30,840,000                   143,957,000 145,845,000                        
        total current liabilities
      3,886,334,000 4,072,092,000 3,490,210,000 3,593,764,000 3,791,695,000 3,969,016,000 3,471,960,000 3,461,798,000 3,640,290,000 3,777,719,000 3,312,714,000 3,337,252,000 3,454,256,000 3,597,600,000 3,085,893,000 3,178,382,000 3,260,416,000 3,378,780,000 2,904,544,000 2,909,606,000 2,812,421,000 2,947,494,000 2,521,562,000 2,539,322,000 2,530,338,000 2,856,534,000 2,527,263,000 2,482,151,000 2,568,918,000 2,620,935,000 2,343,596,000 2,513,804,000 3,185,856,000 2,822,585,000 2,482,035,000 2,243,907,000 1,470,356,000 1,460,249,000 1,417,424,000 1,387,241,000 1,291,224,000 1,323,492,000 1,235,100,000 1,204,520,000 1,420,731,000 1,215,218,000 1,358,872,000 1,358,872,000 1,345,548,000 1,266,621,000 1,159,923,000 1,043,993,000 1,014,840,000 975,092,000 1,070,000,000 968,893,000 908,357,000 
        long-term debt
      2,977,971,000 2,976,674,000 2,462,308,000 2,461,629,000 2,460,949,000 2,459,915,000 2,458,889,000 2,457,872,000 2,456,877,000 2,448,696,000 2,449,913,000 2,451,137,000 2,452,369,000 2,453,607,000 2,454,853,000 2,455,506,000 2,456,166,000 2,456,833,000 2,457,643,000 2,457,854,000 1,949,078,000 1,958,286,000 1,957,473,000 1,937,232,000 2,035,273,000 2,043,888,000 2,051,507,000 2,059,131,000 2,094,758,000 2,116,109,000 2,077,466,000 2,146,829,000 2,186,061,000 2,899,124,000 2,922,229,000 3,140,307,000 1,599,331,000 664,391,000 696,405,000 756,015,000 832,500,000 790,000,000 820,000,000 695,000,000 380,000,000 385,000,000 125,000,000 125,000,000 128,750,000 132,500,000 136,250,000 140,000,000 143,750,000 147,500,000 115,000,000 120,000,000 130,000,000 
        operating lease liabilities
      275,635,000 270,200,000 293,536,000 311,150,000 324,549,000 339,779,000 452,311,000 471,553,000 491,182,000 513,406,000 531,048,000 555,085,000 575,963,000 597,267,000 614,442,000 646,677,000 677,616,000 697,766,000 740,088,000 745,108,000 765,125,000 780,166,000 785,705,000 802,119,000 813,883,000 832,533,000                                
        other liabilities
      451,949,000 446,526,000 446,460,000 428,618,000 404,714,000 406,792,000 397,608,000 392,827,000 403,287,000 415,464,000 384,091,000 425,953,000 423,486,000 423,464,000 435,692,000 452,896,000 473,102,000 511,887,000 557,857,000 548,134,000 519,640,000 539,593,000 538,359,000 540,402,000 530,577,000 479,746,000 462,355,000 456,314,000 424,947,000 613,673,000 582,207,000 570,872,000 555,540,000 577,999,000 743,818,000 756,998,000 192,796,000 181,817,000 174,409,000 214,093,000 200,455,000 193,594,000 196,031,000 131,674,000 128,152,000 142,962,000 132,558,000 132,558,000 125,001,000 121,869,000 126,093,000 122,770,000 126,503,000 125,646,000 129,604,000 128,790,000 126,767,000 
        total liabilities
      7,591,889,000 7,765,492,000 6,692,514,000 6,795,161,000 6,981,907,000 7,175,502,000 6,780,768,000 6,784,050,000 6,991,636,000 7,155,285,000 6,677,766,000 6,769,427,000 6,906,074,000 7,071,938,000 6,590,880,000 6,733,461,000 6,867,300,000 7,045,266,000 6,660,132,000 6,660,702,000 6,046,264,000 6,225,539,000 5,803,099,000 5,819,075,000 5,910,071,000 6,212,701,000 5,817,687,000 5,765,839,000 5,857,778,000 5,350,717,000 5,003,269,000 5,231,505,000 5,927,457,000 6,299,708,000 6,148,082,000 6,141,212,000 3,262,483,000 2,306,457,000 2,288,238,000 2,357,349,000 2,324,179,000 2,307,086,000 2,251,131,000 2,031,194,000 1,928,883,000 1,743,180,000 1,616,430,000 1,616,430,000 1,599,299,000 1,520,990,000 1,422,266,000 1,306,763,000 1,285,093,000 1,248,238,000 1,314,604,000 1,217,683,000 1,165,124,000 
        stockholders’ equity
                                                               
        preferred stock, 0.01 par value...
                                                               
        common stock
      82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 82,000  82,000 82,000 78,000  78,000 78,000 78,000  78,000 78,000 78,000  78,000 78,000 78,000 78,000  78,000 78,000 78,000  78,000 78,000 
        additional paid-in capital
      2,729,386,000 2,679,101,000 2,640,460,000 2,602,976,000 2,553,170,000 2,497,130,000 2,460,664,000 2,421,835,000 2,373,501,000 2,320,289,000 2,291,013,000 2,259,057,000 2,222,511,000 2,179,604,000 2,161,940,000 2,136,684,000 2,107,596,000 2,074,896,000 2,054,563,000 2,031,726,000 2,003,473,000 1,968,930,000 1,960,143,000 1,941,509,000 1,922,608,000 1,899,273,000 1,885,370,000 1,868,878,000 1,852,618,000 1,823,710,000 1,810,545,000 1,798,075,000 1,788,045,000 1,761,383,000 1,748,610,000 1,732,560,000 880,877,000 863,127,000 851,077,000 847,451,000 832,973,000 818,546,000 806,537,000 795,408,000 781,934,000 764,433,000 754,827,000 754,827,000 743,020,000 733,139,000 718,644,000 707,439,000 698,293,000 689,182,000 679,871,000 671,255,000 661,050,000 
        accumulated other comprehensive loss
      -45,055,000 -41,015,000 -36,245,000 -46,615,000 -67,849,000 -88,333,000 -55,633,000 -81,653,000 -82,386,000 -76,331,000 -94,558,000 -85,127,000 -95,910,000 -101,610,000 -130,548,000 -104,516,000 -82,811,000 -81,431,000 -83,837,000 -82,978,000 -93,178,000 -99,228,000 -130,213,000 -142,175,000 -168,972,000 -77,938,000 -81,264,000 -73,479,000 -61,566,000      -1,216,000 -48,889,000 -47,832,000 -49,683,000 -47,784,000 -48,003,000 -49,430,000 -44,402,000 -49,274,000 -35,617,000 -42,328,000             
        accumulated earnings
      6,944,582,000 6,722,238,000 6,480,086,000 6,444,729,000 6,203,946,000 5,993,007,000 5,594,434,000 5,179,385,000 4,949,837,000 4,739,292,000 4,530,661,000 4,350,652,000 4,152,609,000 3,856,826,000 3,600,012,000 3,426,467,000 3,221,542,000 3,049,027,000 2,839,668,000 2,690,803,000 2,419,567,000 2,255,467,000 2,135,860,000 2,118,896,000 2,063,819,000 1,988,722,000 1,921,021,000 1,879,633,000 1,776,227,000 1,755,432,000 1,671,412,000 1,659,658,000 1,613,980,000 1,647,284,000 1,539,978,000 1,588,158,000 1,680,439,000 1,644,005,000 1,577,521,000 1,538,762,000 1,490,851,000 1,450,684,000 1,384,922,000 1,354,555,000 1,303,401,000 1,275,049,000 1,215,905,000 1,215,905,000 1,182,059,000 1,129,019,000 1,091,283,000 1,029,865,000 991,671,000 945,157,000 908,482,000 849,659,000 818,284,000 
        treasury stock
      -9,565,611,000 -9,040,498,000 -8,527,831,000 -7,468,546,000 -7,191,495,000 -7,042,717,000 -6,934,865,000 -6,872,990,000 -6,522,860,000 -6,302,698,000 -6,160,560,000 -5,938,158,000 -5,806,434,000 -5,707,104,000 -5,696,412,000 -5,601,584,000 -5,128,256,000 -4,671,516,000 -4,475,969,000 -4,111,995,000 -3,438,350,000 -3,034,823,000 -2,928,369,000 -2,927,093,000 -2,927,262,000 -2,871,546,000 -2,805,552,000 -2,711,312,000 -2,710,464,000 -2,688,600,000 -2,517,807,000 -2,512,332,000 -2,446,761,000 -2,426,792,000 -2,424,044,000 -2,418,236,000 -2,410,745,000 -2,396,649,000 -2,391,390,000 -2,391,116,000 -2,387,142,000 -2,357,306,000 -2,301,852,000 -2,284,579,000 -2,182,598,000 -1,857,219,000 -1,816,286,000 -1,816,286,000 -1,737,601,000 -1,634,065,000 -1,457,034,000 -1,422,481,000 -1,363,706,000 -1,318,023,000 -1,287,726,000 -1,268,200,000 -1,268,044,000 
        total stockholders’ equity
      63,384,000 319,908,000 556,552,000 1,532,626,000 1,497,854,000 1,359,169,000 1,064,682,000 646,659,000 718,174,000 680,634,000 566,638,000 586,506,000 472,858,000 227,798,000   118,153,000 371,058,000 334,507,000 527,638,000 891,594,000 1,090,428,000 1,037,503,000 991,219,000 890,275,000 938,593,000 919,657,000 963,802,000 856,897,000 850,757,000 941,548,000 921,432,000 987,571,000 983,465,000 863,410,000 853,675,000 102,817,000 60,878,000        161,171,000 152,523,000 152,523,000 197,509,000 236,723,000 361,316,000 321,635,000 328,694,000 319,157,000 306,673,000 261,465,000 214,991,000 
        total liabilities and stockholders’ equity
      7,655,273,000 8,085,400,000 7,249,066,000 8,327,787,000 8,479,761,000 8,534,671,000 7,845,450,000 7,430,709,000 7,709,810,000 7,835,919,000 7,244,404,000 7,355,933,000 7,378,932,000 7,299,736,000   6,985,453,000 7,416,324,000 6,994,639,000 7,188,340,000 6,937,858,000 7,315,967,000 6,840,602,000 6,810,294,000 6,800,346,000 7,151,294,000 6,737,344,000 6,729,641,000 6,714,675,000 6,201,474,000 5,944,817,000 6,152,937,000 6,915,028,000 7,283,173,000 7,011,492,000 6,994,887,000 3,365,300,000 2,367,335,000        1,904,351,000 1,768,953,000 1,768,953,000 1,796,808,000 1,757,713,000 1,783,582,000 1,628,398,000 1,613,787,000 1,567,395,000 1,621,277,000 1,479,148,000 1,380,115,000 
        fees receivable, net of allowances of 5,000 and 8,500, respectively
       1,684,522,000 1,120,487,000                                                       
        stockholders’ equity:
                                                               
        preferred stock:
                                                               
        0.01 par value...
                                                               
        common stock:
                                                               
        0.0005 par value, 250,000,000 shares authorized; 163,602,067 shares issued for both periods
       82,000    82,000    82,000    82,000    82,000    82,000    82,000                                
        fees receivable, net of allowances of 6,500 and 8,500, respectively
         1,263,163,000                                                      
        fees receivable, net of allowances of 7,500 and 8,500, respectively
          1,503,582,000                                                     
        fees receivable, net of allowances of 8,500 and 9,000, respectively
           1,696,225,000                                                    
        fees receivable, net of allowances of 9,000 for both periods
            1,305,754,000 1,404,321,000 1,565,960,000 1,601,228,000                                                
        fees receivable, net of allowances of 8,000 and 9,000, respectively
                1,140,563,000 1,271,792,000 1,523,441,000                                             
        fees receivable, net of allowances of 9,000 and 6,500, respectively
                   1,556,786,000                                            
        fees receivable, net of allowances of 7,500 and 6,500, respectively
                    1,047,140,000                                           
        liabilities and stockholders’ (deficit) equity
                                                               
        stockholders’ (deficit) equity
                                                               
        total stockholders’ (deficit) equity
                    -64,926,000 -142,867,000                          -132,400,000 -159,589,000 -170,155,000 -139,513,000             
        total liabilities and stockholders’ (deficit) equity
                    6,525,954,000 6,590,594,000                          2,174,686,000 2,091,542,000 1,861,039,000 1,789,370,000             
        fees receivable, net of allowances of 9,500 and 6,500, respectively
                     1,171,996,000                                          
        fees receivable, net of allowances of 8,000 and 6,500, respectively
                      1,326,398,000                                         
        fees receivable, net of allowances of 6,500 and 10,000, respectively
                       1,365,180,000                                        
        fees receivable, net of allowances of 6,000 and 10,000, respectively
                        969,966,000                                       
        fees receivable, net of allowances of 8,000 and 10,000, respectively
                         1,102,562,000                                      
        fees receivable, net of allowances of 9,000 and 10,000, respectively
                          1,175,426,000                                     
        fees receivable, net of allowances of 10,000 and 8,000, respectively
                           1,241,508,000 948,864,000                                   
        fees receivable, net of allowances of 11,000 and 8,000, respectively
                             1,048,519,000                                  
        fees receivable, net of allowances of 9,000 and 8,000, respectively
                              1,148,565,000                                 
        fees receivable, net of allowances of 8,000 and 7,700, respectively
                               1,326,012,000                                
        fees receivable, net of allowances of 7,800 and 7,700, respectively
                                1,028,320,000 1,112,856,000                              
        operating leases - right-of-use assets
                                652,273,000 637,701,000 634,142,000                             
        operating leases - liabilities
                                776,562,000 768,243,000 769,155,000                             
        preferred stock, .01 par value...
                                                               
        fees receivable, net of allowances of 7,700 for both periods
                                  1,178,859,000                             
        fees receivable, net of allowances of 7,700 and 12,700, respectively
                                   1,255,118,000 979,181,000                           
        .01 par value...
                                                               
        .0005 par value, 250,000,000 shares authorized; 163,602,067 shares issued for both periods
                                   82,000                            
        accumulated other comprehensive income
                                   -39,867,000 -22,684,000 -24,051,000 32,225,000 1,508,000            -21,170,000 -2,001,000 -2,001,000 9,953,000 8,552,000 8,345,000 6,734,000 2,358,000 2,763,000 5,968,000 8,673,000 3,623,000 
        fees receivable, net of allowances of 7,200 and 12,700, respectively
                                     1,083,990,000                          
        fees receivable, net of allowances of 7,100 and 12,700 respectively
                                      1,134,964,000                         
        fees receivable, net of allowances of 12,700 and 7,400 respectively
                                       1,176,843,000                        
        .0005 par value, authorized 250,000,000 shares for both periods; 163,602,067 shares issued at december 31, 2017 and 156,234,415 shares issued at december 31, 2016
                                       82,000                        
        fees receivable, net of allowances of 10,000 and 7,400, respectively
                                        874,283,000                       
        fees receivable, net of allowances of 9,400 and 7,400, respectively
                                         886,393,000                      
        fees receivable, net of allowances of 7,900 and 7,400, respectively
                                          716,487,000                     
        fees receivable, net of allowances of 7,400 and 6,900 respectively
                                           643,013,000                    
        .0005 par value, authorized 250,000,000 shares for both periods; 156,234,415 shares issued for both periods
                                           78,000    78,000    78,000     78,000    78,000   
        fees receivable, net of allowances of 7,000 and 6,900, respectively
                                            560,202,000                   
        liabilities and stockholders’ deficit
                                                               
        stockholders’ deficit
                                                               
        total stockholders’ deficit
                                            -10,498,000 -52,828,000 -112,670,000                 
        total liabilities and stockholders’ deficit
                                            2,277,740,000 2,304,521,000 2,211,509,000                 
        fees receivable, net of allowances of 7,350 and 6,900, respectively
                                             613,795,000                  
        revenues:
                                                               
        research
                                             449,170,000                  
        consulting
                                             94,068,000                  
        events
                                             66,760,000                  
        total revenues
                                             609,998,000                  
        costs and expenses:
                                                               
        cost of services and product development
                                             231,422,000                  
        selling, general and administrative
                                             272,009,000                  
        depreciation
                                             9,025,000                  
        amortization of intangibles
                                             6,210,000                  
        acquisition and integration charges
                                             8,033,000                  
        total costs and expenses
                                             526,699,000                  
        operating income
                                             83,299,000                  
        interest expense
                                             -7,356,000                  
        other income
                                             1,248,000                  
        income before income taxes
                                             77,191,000                  
        benefit from income taxes
                                             29,280,000                  
        net income
                                             47,911,000                  
        net income per share
                                                               
        basic
                                             580                  
        diluted
                                             570                  
        weighted-average shares outstanding:
                                                               
        fees receivable, net of allowances of 7,200 and 6,900, respectively
                                              602,877,000                 
        fees receivable, net of allowances of 6,900 and 6,700 respectively
                                               580,763,000                
        stockholders’ (deficit) equity:
                                                               
        fees receivable, net of allowances of 6,560 and 6,700, respectively
                                                482,302,000               
        fees receivable, net of allowances of 6,800 and 6,700, respectively
                                                 527,615,000              
        fees receivable, net of allowances of 6,600 and 6,700, respectively
                                                  526,384,000             
        fees receivable, net of allowances of 6,700 and 7,000 respectively
                                                   552,107,000            
        fees receivable, net of allowances of 6,900 and 7,000, respectively
                                                    449,923,000 449,923,000          
        fees receivable, net of allowances of 7,500 and 7,000, respectively
                                                      493,216,000         
        fees receivable, net of allowances of 7,100 and 7,000, respectively
                                                       496,997,000        
        fees receivable, net of allowances of 7,000 and 6,400 respectively
                                                        490,923,000       
        fees receivable, net of allowances of 6,100 and 6,400, respectively
                                                         392,174,000      
        fees receivable, net of allowances of 6,300 and 6,400, respectively
                                                          432,011,000     
        fees receivable, net of allowances of 6,120 and 6,400, respectively
                                                           441,405,000    
        fees receivable, net of allowances of 6,400 and 7,260 respectively
                                                            463,968,000   
        fees receivable
                                                             370,951,000 389,414,000 
      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 2015-05-07 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 
                                                                
          operating activities:
                                                                
          net income
        222,344,000 242,152,000 35,357,000 240,783,000 210,939,000 398,573,000 415,049,000 229,548,000 210,545,000 208,631,000 180,009,000 198,043,000 295,783,000 256,814,000 173,545,000 204,925,000 172,515,000 209,359,000 148,865,000 271,236,000 164,100,000 119,607,000 16,964,000 55,077,000 75,097,000 67,701,000 41,388,000 103,406,000 20,795,000 84,020,000 11,753,000 46,270,000 -19,587,000 107,307,000 -48,180,000 -92,281,000 36,433,000 66,485,000 39,019,000 47,911,000 40,167,000 65,763,000 30,366,000 51,155,000 28,351,000 28,351,000 59,144,000 33,846,000 53,040,000 37,736,000 61,418,000 38,194,000 46,514,000 36,675,000 58,823,000 31,375,000 
          adjustments to reconcile net income to cash from operating activities:
                                                                
          depreciation and amortization
        45,431,000 47,857,000 50,953,000 50,739,000 50,760,000 51,222,000 51,252,000 50,534,000 49,307,000 49,323,000 48,536,000 46,613,000 46,631,000 48,682,000 47,251,000 47,664,000 48,349,000 51,656,000 52,480,000 52,005,000 56,264,000 56,381,000 53,971,000 53,936,000 54,696,000 53,660,000 52,398,000 52,263,000 53,458,000 52,520,000 68,187,000 66,838,000 68,056,000 71,520,000 68,564,000 83,557,000 16,530,000  15,752,000 15,235,000 15,017,000  12,188,000 9,606,000 10,128,000 10,128,000  10,450,000 9,700,000 8,738,000       
          stock-based compensation expense
        45,870,000 32,159,000 30,523,000 43,027,000 50,168,000 30,194,000 34,343,000 39,747,000 50,500,000 25,518,000 27,042,000 32,233,000 45,048,000 13,023,000 20,968,000 24,454,000 32,121,000 16,868,000 19,426,000 26,190,000 36,086,000 6,232,000 15,501,000 15,678,000 25,129,000 11,115,000 12,954,000 13,120,000 31,819,000 10,154,000 10,718,000 14,342,000 30,958,000 11,013,000 14,357,000 30,997,000 22,576,000 10,533,000 9,521,000   9,169,000 9,588,000 10,663,000 16,729,000 16,729,000 9,420,000 8,808,000 6,865,000 13,752,000 7,686,000 7,475,000 7,232,000 12,342,000 8,357,000 9,219,000 
          deferred taxes
        1,991,000 43,871,000 -2,109,000 -11,224,000 -29,710,000 -156,281,000 -8,891,000 20,914,000 -17,823,000 -14,623,000 -33,397,000 -8,287,000 -7,866,000 -33,178,000 -780,000 10,758,000 -7,502,000 -42,016,000 -1,845,000 -1,589,000 3,883,000 -46,642,000 -4,735,000 -27,350,000 25,537,000 -4,997,000 -1,376,000 -23,884,000 -25,530,000 6,270,000 13,273,000 21,156,000 -39,175,000 -117,964,000 -21,446,000 -66,006,000 -11,998,000 10,767,000 -12,570,000 1,346,000 -2,191,000 6,068,000 -8,022,000 5,656,000 -3,358,000 -3,358,000 540,000 -5,749,000 -2,901,000 7,351,000 11,674,000 6,736,000 125,000 -1,872,000 4,241,000 133,000 
          gain from sale of divested operation
        -6,138,000         3,906,000 -139,316,000                                            
          reduction in the carrying amount of operating lease right-of-use assets
        14,894,000 14,733,000 14,725,000 17,002,000 17,736,000 17,311,000 16,264,000 16,139,000 16,028,000 17,466,000 17,384,000 17,713,000 17,644,000 17,400,000 17,320,000 17,415,000 17,951,000 18,963,000 18,901,000 18,686,000 18,575,000 18,975,000 19,620,000 20,394,000 22,862,000                                
          amortization and write-off of deferred financing fees
        1,298,000  1,050,000 1,041,000 1,034,000 1,026,000 1,017,000 1,011,000 1,537,000 1,183,000 1,176,000 1,169,000 1,161,000 1,154,000 1,147,000 1,140,000 1,133,000 1,126,000 1,122,000 991,000 923,000 937,000 2,095,000 3,755,000 1,637,000 1,632,000 1,627,000 1,622,000 1,616,000 1,610,000 1,604,000 8,733,000 1,868,000 1,826,000 3,761,000    453,000                  
          gain on de-designated swaps
         -43,000 -281,000 -165,000 -1,718,000 2,886,000   3,725,000 -2,549,000   -563,000 -11,198,000 -10,651,000 -29,896,000   4,014,000 -15,765,000                                    
          changes in assets and liabilities, net of acquisitions and divestitures:
                                                                
          fees receivable
        270,936,000 -589,748,000 152,650,000 263,513,000 211,612,000 -424,402,000 113,727,000 154,679,000 18,228,000 -442,695,000 123,464,000 258,392,000 36,177,000 -499,239,000 99,445,000 128,398,000 30,700,000 -402,887,000 124,891,000 78,458,000 54,192,000 -269,710,000 107,995,000 125,463,000 135,661,000 -281,861,000 74,291,000 62,451,000 78,390,000 -287,682,000 91,457,000 24,451,000 56,771,000 -353,426,000 29,849,000 12,980,000 -57,919,000 -94,903,000 46,622,000 -1,291,000 -19,089,000 -101,521,000 43,463,000 3,951,000 9,631,000 9,631,000 -113,789,000 34,456,000 7,119,000 -4,210,000 -97,829,000 42,661,000 9,220,000 17,851,000 -92,774,000 23,497,000 
          deferred commissions
        21,265,000 -99,117,000 37,440,000 45,796,000 41,131,000 -117,338,000 20,720,000 28,650,000 26,413,000 -91,226,000 23,457,000 34,418,000 19,635,000 -91,267,000 36,685,000 41,247,000 18,909,000 -131,657,000 -3,711,000 10,731,000 -237,000 -47,438,000 24,839,000 13,735,000 17,520,000 -65,644,000 12,355,000 18,901,000 4,073,000 -69,463,000 16,398,000 22,330,000 -512,000 -64,624,000 2,754,000 -2,525,000 3,002,000 -31,049,000 -2,945,000 8,274,000 7,047,000 -31,487,000 2,712,000 7,187,000 8,352,000 8,352,000 -36,886,000 6,507,000 9,461,000 8,578,000 -28,663,000 1,208,000 4,734,000 4,113,000 -22,073,000 3,476,000 
          prepaid expenses and other current assets
        -38,527,000 53,357,000 -31,728,000 -14,531,000 -5,338,000 18,021,000 -24,429,000 24,984,000 -47,509,000 31,311,000 -20,537,000 -297,000 -18,370,000 16,897,000 312,000 -6,652,000 -13,596,000 2,505,000 -17,596,000 9,111,000 -9,933,000 46,999,000 -23,306,000 26,858,000 -12,656,000 19,926,000 -17,675,000 7,843,000 8,891,000 13,844,000 18,513,000 -29,057,000 -53,851,000 45,410,000 -9,706,000 -17,138,000 -5,315,000 21,798,000 -44,069,000 -7,538,000 8,205,000 29,079,000 -25,154,000 5,771,000 -22,964,000 -22,964,000 20,814,000 -18,835,000 -630,000 -4,366,000 19,653,000 -16,902,000 529,000 -4,467,000 8,199,000 -11,366,000 
          other assets
        -7,930,000 -1,810,000 -8,478,000 -5,083,000 -15,568,000 -7,938,000 -7,032,000 -4,224,000 -24,309,000 -5,776,000 1,986,000 -15,939,000 -14,799,000 2,069,000 -4,946,000 12,399,000 -1,082,000 5,692,000 -210,000 -13,688,000 -10,081,000 -5,441,000 -2,577,000 -6,893,000 5,961,000 19,651,000 2,570,000 -21,007,000 -28,517,000 -11,988,000 -418,000 9,441,000 14,421,000 58,019,000 -59,220,000 -598,000 -16,730,000 -1,592,000 23,134,000 -6,973,000 5,436,000 -1,855,000 -24,042,000 -1,763,000 12,927,000 12,927,000 -5,836,000 2,405,000 -2,397,000 -1,311,000 -2,204,000 -536,000 3,939,000 -6,467,000 12,684,000 4,274,000 
          deferred revenues
        213,649,000 293,113,000 -180,699,000 -285,359,000 131,001,000 265,141,000 -99,896,000 -157,607,000 173,542,000 221,329,000 -88,116,000 -118,449,000 155,153,000 204,597,000 -119,556,000 16,777,000 195,306,000 220,494,000 -87,249,000 59,028,000 131,786,000 226,168,000 -60,555,000 -123,387,000 -26,228,000 111,197,000 22,083,000 -37,817,000 85,740,000 118,252,000 -18,421,000 10,462,000 76,854,000 184,499,000 30,941,000 75,039,000 92,373,000 -16,218,000 7,426,000 27,630,000 79,141,000 -17,755,000 16,141,000 19,246,000 74,208,000 74,208,000 12,761,000 15,493,000 11,820,000 65,280,000 16,276,000 -2,658,000 16,301,000 51,019,000 10,964,000 13,954,000 
          accounts payable and accrued and other liabilities
        -394,044,000 256,750,000 44,992,000 37,551,000 -350,088,000 253,585,000 73,334,000 -33,835,000 -263,688,000 218,858,000 52,156,000 -17,246,000 -282,315,000 250,296,000 52,683,000 -83,890,000 -321,001,000 243,201,000 90,363,000 60,174,000 -272,495,000 157,013,000 48,811,000 175,582,000 -269,467,000                                
          cash from operating activities
        391,039,000 294,544,000 298,744,000 383,565,000 313,512,000 335,355,000 590,767,000 369,964,000 188,836,000 224,330,000 330,946,000 435,782,000 164,679,000 203,109,000 314,921,000 415,607,000 167,785,000 234,786,000 345,039,000 575,347,000 157,298,000 260,448,000 243,913,000 343,168,000 55,749,000 82,835,000 219,523,000 227,482,000 35,596,000 45,147,000 249,264,000 174,023,000 2,724,000 22,250,000 149,549,000 112,323,000 -29,605,000 83,369,000 128,949,000 144,734,000 8,580,000 79,254,000 116,904,000 143,740,000 5,663,000 5,663,000 71,170,000 122,851,000 136,288,000 16,470,000 73,585,000 101,753,000 120,623,000 19,693,000 71,062,000 109,299,000 
          capital expenditures
          free cash flows
        391,039,000 294,544,000 298,744,000 383,565,000 313,512,000 335,355,000 590,767,000 369,964,000 188,836,000 224,330,000 330,946,000 435,782,000 164,679,000 203,109,000 314,921,000 415,607,000 167,785,000 234,786,000 345,039,000 575,347,000 157,298,000 260,448,000 243,913,000 343,168,000 55,749,000 82,835,000 219,523,000 227,482,000 35,596,000 45,147,000 249,264,000 174,023,000 2,724,000 22,250,000 149,549,000 112,323,000 -29,605,000 83,369,000 128,949,000 144,734,000 8,580,000 79,254,000 116,904,000 143,740,000 5,663,000 5,663,000 71,170,000 122,851,000 136,288,000 16,470,000 73,585,000 101,753,000 120,623,000 19,693,000 71,062,000 109,299,000 
          investing activities:
                                                                
          additions to property, equipment and leasehold improvements
        -20,423,000 -23,832,000 -29,493,000 -36,248,000 -25,569,000 -23,941,000 -25,769,000 -29,367,000 -22,660,000 -27,979,000 -28,451,000 -25,572,000 -21,122,000 -37,589,000 -32,076,000 -21,092,000 -17,293,000 -21,164,000 -14,191,000 -11,958,000 -12,521,000 -23,043,000 -14,980,000 -21,329,000 -24,536,000 -53,315,000 -36,222,000 -39,419,000 -20,060,000 -62,242,000 -24,505,000 -22,447,000 -17,679,000 -35,146,000 -33,992,000 -30,927,000 -10,700,000 -12,986,000 -11,540,000 -18,777,000 -6,560,000 -10,061,000 -12,453,000 -11,982,000 -11,632,000 -11,632,000 -12,970,000 -6,365,000 -9,966,000 -9,185,000 -8,726,000 -8,137,000 -9,987,000 -9,648,000 -13,537,000 -10,158,000 
          proceeds from sale of divested operation, net of cash transferred
        104,798,000                                                        
          cash from investing activities
        84,375,000 -23,832,000 -29,493,000 -36,248,000 -25,569,000 -23,941,000 -25,769,000 -29,367,000 -24,660,000 -22,955,000 -32,251,000 -28,248,000 137,611,000 -42,988,000 -36,185,000 -21,092,000 -17,293,000 -18,767,000 -14,447,000 -34,732,000 -12,521,000 -23,043,000 -14,980,000 -21,329,000 -24,536,000 -62,889,000 -36,222,000 -39,419,000 -22,355,000  73,807,000 383,095,000 -16,679,000 -35,146,000 -46,459,000 -2,523,954,000 -140,015,000 -17,809,000 -11,007,000 -47,873,000 -7,360,000 -10,812,000 -207,931,000 -11,982,000 -11,632,000 -11,632,000 -15,370,000 -6,365,000 -16,587,000 -124,455,000 -8,726,000 -8,137,000 -9,987,000 -9,648,000 -13,537,000 -10,985,000 
          financing activities:
                                                                
          proceeds from employee stock purchase plan
        8,661,000 7,247,000 7,736,000 7,731,000 9,736,000 7,395,000 6,332,000 6,413,000 8,047,000 5,992,000 5,875,000 5,882,000 7,358,000 5,251,000 4,985,000 5,046,000 6,949,000 4,646,000 4,113,000 4,057,000 5,357,000 4,272,000 4,094,000 4,078,000 5,641,000 4,394,000 4,158,000 3,994,000 5,083,000 3,555,000 3,507,000 3,503,000 4,124,000 3,161,000 2,888,000 2,640,000 3,022,000  2,229,000                  
          payments of deferred financing fees
        -1,508,000      -368,000 -2,604,000          -1,275,000    -13,111,000                                  
          purchases of treasury stock
        -534,637,000 -498,469,000 -1,055,523,000 -274,483,000 -162,672,000 -101,981,000 -68,660,000 -339,593,000 -225,124,000 -158,449,000 -209,367,000 -131,522,000 -106,850,000 -17,328,000 -96,534,000 -478,810,000 -451,070,000 -216,739,000 -355,458,000 -684,900,000 -398,450,000 -100,185,000 -2,255,000 -698,000 -73,164,000 -57,606,000 -94,878,000 -1,719,000 -44,839,000 -156,432,000 -8,129,000 -67,877,000 -28,394,000 -4,084,000 -3,402,000 -11,808,000 -21,978,000 -6,072,000 -922,000 -6,480,000 -45,487,000 -56,049,000 -11,558,000 -117,400,000 -324,042,000 -324,042,000 -44,880,000 -79,678,000 -111,598,000 -195,850,000 -24,485,000 -59,251,000 -49,473,000 -48,527,000 -22,004,000 -4,625,000 
          cash from financing activities
        -527,484,000 27,757,000 -1,047,787,000 -266,752,000 -152,936,000 -94,586,000 -62,328,000 -333,548,000 -219,681,000 -154,857,000 -205,292,000 -127,440,000 -101,292,000 -14,012,000 -92,882,000 -475,096,000 -445,452,000 -213,423,000 -353,949,000 -187,017,000 -403,220,000 -98,199,000 -42,272,000 -207,263,000 -68,490,000 -53,179,000 -90,685,000 -118,690,000 -23,438,000 -43,559,000 -266,303,000 -618,170,000 -329,083,000 -65,737,000 -80,327,000 1,768,623,000 917,271,000  -97,162,000    115,306,000 -62,091,000 -54,410,000 -54,410,000  -78,377,000 -85,833,000 -32,276,000       
          net increase in cash and cash equivalents
        -52,070,000                      186,661,000           -78,633,000 22,763,000 -643,008,000 747,651,000 21,807,000 20,780,000 36,246,000 28,064,000 1,947,000 24,279,000    43,616,000 38,109,000 33,868,000 -140,261,000 48,857,000 36,847,000 66,458,000 -26,861,000 43,329,000 99,048,000 
          effects of exchange rates on cash and cash equivalents
        -3,505,000  11,730,000 25,923,000 22,894,000  29,837,000 -7,665,000 -27,693,000  -16,876,000 -778,000 -5,485,000  -21,749,000 -15,121,000 -5,358,000  -7,370,000 864,000 -8,145,000  10,421,000 14,207,000 -15,709,000         -2,475,000 17,971,000 4,399,000 6,007,000 -13,308,000 -99,000 4,864,000 2,903,000 -215,000 -10,616,000 6,261,000 -23,270,000 -23,270,000 -19,534,000 -14,814,000 773,000 -445,000 612,000 4,311,000 -2,158,000 -3,928,000 1,132,000 5,812,000 
          cash and cash equivalents, beginning of period
        1,722,521,000                  712,583,000    280,836,000         474,233,000 372,976,000 365,302,000 365,302,000 423,990,000 299,852,000 
          cash and cash equivalents, end of period
        1,666,946,000  -766,806,000 106,488,000 2,091,048,000                445,995,000  197,082,000 128,783,000 227,850,000         -81,108,000 40,734,000 -638,609,000 1,227,891,000 8,499,000 20,681,000 41,110,000 403,943,000 1,732,000 13,663,000 75,928,000 281,653,000 281,653,000 24,082,000 23,295,000 34,641,000 283,284,000 49,469,000 41,158,000 64,300,000 269,063,000 44,461,000 104,860,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                
          goodwill impairment
                                                               
          loss on impairment of lease related assets
         64,000 4,111,000   7,959,000 2,423,000 527,000 1,306,000 335,000 10,007,000 8,720,000 16,424,000 2,045,000 11,623,000 23,878,000                                        
          amortization and write-off of deferred financing fees and unamortized discounts
                                                                
          acquisitions - cash paid
                    -5,399,000    91,000 -256,000       -23,694,000       -12,467,000    533,000 -29,096,000 -800,000               
          proceeds from sale of divested operation
                 5,024,000 -2,676,000 158,733,000                                            
          proceeds from issuance of long-term debt, net of discounts
                                                                
          payments for deferred financing fees
                                         -1,000                      
          proceeds from revolving credit facility
             274,400,000             5,000,000                                  
          payments on revolving credit facility
                         -5,000,000                                  
          payments on long-term debt
              -274,400,000                                                
          net increase in cash and cash equivalents and restricted cash
         298,469,000 -778,536,000 80,565,000 135,007,000 216,828,000 502,670,000 7,049,000 -55,505,000 46,518,000 93,403,000 280,094,000 200,998,000 146,109,000 185,854,000   2,596,000 -23,357,000       -33,233,000 92,616,000   -54,584,000 56,768,000 -61,052,000 -343,038,000                        
          effects of exchange rates on cash and cash equivalents and restricted cash
                                 7,342,000 -4,342,000 -190,000 804,000 -45,000 -3,432,000 -6,622,000 3,610,000                        
          cash and cash equivalents and restricted cash, beginning of year
                                                                
          cash and cash equivalents and restricted cash, end of year
                                                                
          supplemental disclosures of cash flow information:
                                                                
          cash paid during the year for:
                                                                
          interest
                                                                
          income taxes, net of refunds received
                                                                
          acquisition of business
              -2,000,000                                                
          cash and cash equivalents and restricted cash, beginning of period
          1,933,147,000  1,319,599,000  698,599,000  760,602,000         158,663,000 567,058,000                        
          payments on borrowings
                 -2,400,000 -1,800,000 -1,800,000 -1,800,000 -1,935,000 -1,333,000 -1,332,000 -1,331,000 -1,330,000 -1,329,000 -100,129,000 -5,127,000 -5,127,000 -1,200,248,000 -852,127,000 -967,000 33,000 35,000 -90,965,000 -18,682,000 109,318,000 -261,681,000 -553,796,000 -304,813,000 -64,814,000 -219,812,000    -7,500,000 -815,000,000 -5,000,000                
          cash and cash equivalents and restricted cash, end of period
              532,507,000 -616,000 1,236,401,000  76,527,000 279,316,000 894,112,000  164,105,000 -95,702,000 460,284,000  -30,727,000        88,274,000 69,183,000 149,270,000 -54,629,000 53,336,000 -67,674,000 227,630,000                        
          loss on de-designated swaps
                -4,462,000    1,393,000                                            
          other
                                   -2,295,000   1,000,000                        
          proceeds from borrowings
                           1,200,000,000   -30,000,000 35,000,000     140,000,000 1,930,000,000 955,000,000 -32,500,000 -82,500,000 760,000,000 70,000,000                
          loss on extinguishment of debt
                                                               
          amortization of deferred swap losses from de-designation
                                                              
          early redemption premium payment
                                                               
          changes in assets and liabilities:
                                                                
          net decrease in cash and cash equivalents and restricted cash
                        -294,960,000            -10,197,000                            
          loss from divested operations
                                 2,075,000                            
          gain on sale of an equity security
                                                                
          proceeds from the sale of an equity security
                                                                
          net decrease in cash and cash equivalents
                            -258,443,000    -37,277,000                    -60,379,000 -60,379,000           
          divestitures - cash received
                                     6,070,000 115,167,000                          
          fair value adjustment - equity security
                                                                
          amortization of lease right-of-use assets
                                  21,136,000 21,617,000 20,939,000                            
          changes in assets and liabilities, net of divestitures:
                                                                
          accounts payable, accrued, and other liabilities
                                  6,892,000 28,967,000 -218,153,000 134,557,000 49,240,000 4,517,000 -133,079,000 78,670,000 137,875,000 79,291,000 -109,025,000 103,612,000 38,137,000 50,999,000 -136,308,000 110,102,000 58,972,000 35,071,000 -121,622,000 -121,622,000 114,323,000 39,998,000 46,821,000 -104,513,000 82,973,000 17,629,000 26,889,000 -85,574,000 74,719,000 30,208,000 
          gain on extinguishment of debt
                                                                
          gain from divested operations
                                     -6,947,000 -13,040,000                          
          cash from in investing activities
                                                                
          cash paid during the period for:
                                                                
          changes in assets and liabilities, net of acquisitions:
                                                                
          excess tax benefits from stock-based compensation exercises
                                                                
          amortization and write-off of debt issuance costs
                                            468,000                    
          business acquisitions - cash paid
                                            -129,315,000                    
          payments for debt issuance costs
                                            -18,773,000              -3,553,000   
          depreciation and amortization of intangibles
                                                          8,978,000 8,609,000 8,421,000 8,434,000 8,364,000 7,663,000 
          amortization and write-off of debt issue costs
                                                      1,073,000 472,000 519,000 581,000 603,000 635,000 614,000 858,000   
          acquisitions
                                                                
          proceeds from esp plan
                                                                
          payments on debt
                                                 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -5,000,000 -190,625,000 -3,750,000 -3,750,000 -1,875,000 -1,875,000 -1,875,000 -1,875,000 -200,000,000 -7,500,000 -7,500,000 
          fees paid for debt refinancing
                                                                
          cash used by financing activities
                                                          -16,002,000 -56,769,000 -44,178,000 -36,906,000 -14,196,000 734,000 
          excess tax benefits from stock-based compensation
                                                  -105,000 -3,561,000 -7,556,000 -7,556,000  -5,000,000 -3,129,000 -11,146,000  -1,298,000 -3,895,000 -13,219,000  -3,638,000 
          acquisitions - increase in restricted cash
                                                             
          stock-based compensation plan expense
                                                15,495,000                
          excess tax benefits from stock-based compensation plans
                                                -4,751,000                
          amortization of debt issue costs
                                                411,000  797,000 758,000 837,000 837,000          504,000 
          proceeds from stock-based compensation plans and esp plan
                                                2,580,000                
          cash provided (used) in financing activities
                                                26,844,000                
          excess tax benefits from employee stock-based compensation exercises
                                                                
          proceeds from employee stock-based compensation plans and esp plan
                                                                
          proceeds from stock issued under stock plans
                                                  1,759,000 1,748,000 2,076,000 2,076,000  1,301,000 2,636,000 2,428,000  1,184,000 1,400,000 1,955,000  1,809,000 
          proceeds from debt issuance
                                                  130,000,000 55,000,000 265,000,000 265,000,000  -1,250,000 23,750,000 151,875,000  1,875,000 1,875,000 200,000,000  7,412,000 
          changes in assets and liabilities, net of acquisition:
                                                                
          acquisition - cash paid
                                                         -101,770,000       
          acquisition - increase in restricted cash
                                                         -13,500,000       
          acquisition
                                                               -827,000