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Operating Segment and Enterprise Wide Reporting - Schedule of Information about Reportable Segments, Disaggregation of Revenue by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 124,269 | $ 108,596 | $ 128,183 | $ 100,649 | $ 98,583 | $ 84,890 | $ 96,353 | $ 77,749 | $ 461,697 | $ 357,575 | $ 337,673
Segment expenses |  |  |  |  |  |  |  |  | 182,584 | 128,365 | 118,711
Contribution margin |  |  |  |  |  |  |  |  | 279,113 | 229,210 | 218,962
Selling, marketing, administrative and other expenses |  |  |  |  |  |  |  |  | (248,621) | (201,836) | (190,632)
Amortization of intangible assets |  |  |  |  |  |  |  |  | (22,619) | (1,162) | (781)
Acquisition and integration costs |  |  |  |  |  |  |  |  | (8,948) | (3,787) |
Interest expense, other income (expense) and gains (losses) on investments |  |  |  |  |  |  |  |  | (8,524) | 1,100 | (178)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (9,599) | 23,525 | 27,371
Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 219,189 | 157,112 | 148,935
Connect [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 56,224 | 51,377 | 48,798
Analytics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 23,322 | 19,910 | 18,738
Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 298,735 | 228,399 | 216,471
Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 135,952 | 115,705 | 109,447
Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 27,010 | 13,471 | 11,755
Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 162,962 | 129,176 | 121,202
Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 167,224 | 149,067 | 143,374
Segment expenses |  |  |  |  |  |  |  |  | 81,520 | 75,039 | 67,739
Contribution margin |  |  |  |  |  |  |  |  | 85,704 | 74,028 | 75,635
Products Segment [Member] | Connect [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 54,350 | 51,377 | 48,798
Products Segment [Member] | Analytics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 23,322 | 19,910 | 18,738
Products Segment [Member] | Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 77,672 | 71,287 | 67,536
Products Segment [Member] | Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 76,567 | 64,309 | 64,083
Products Segment [Member] | Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 12,985 | 13,471 | 11,755
Products Segment [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 89,552 | 77,780 | 75,838
Research Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 214,745 | 208,508 | 194,299
Segment expenses |  |  |  |  |  |  |  |  | 55,330 | 53,326 | 50,972
Contribution margin |  |  |  |  |  |  |  |  | 159,415 | 155,182 | 143,327
Research Segment [Member] | Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 161,487 | 157,112 | 148,935
Research Segment [Member] | Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 161,487 | 157,112 | 148,935
Research Segment [Member] | Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 53,258 | 51,396 | 45,364
Research Segment [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 53,258 | $ 51,396 | $ 45,364
Sirius Decisions Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 79,728 |  |
Segment expenses |  |  |  |  |  |  |  |  | 45,734 |  |
Contribution margin |  |  |  |  |  |  |  |  | 33,994 |  |
Sirius Decisions Segment [Member] | Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 57,702 |  |
Sirius Decisions Segment [Member] | Connect [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,874 |  |
Sirius Decisions Segment [Member] | Research Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 59,576 |  |
Sirius Decisions Segment [Member] | Consulting [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 6,127 |  |
Sirius Decisions Segment [Member] | Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 14,025 |  |
Sirius Decisions Segment [Member] | Advisory Services and Events [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 20,152 |  |

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