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Acquisitions - Summary of Fair Value of Aggregate Consideration Paid or Payable (Parenthetical) (Detail) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 03, 2019 USD ($) | Jul. 06, 2018 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 06, 2018 CHF (SFr)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid |  |  |  |  | $ 237,684,000 | $ 9,250,000 |
SiriusDecisions, Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash acquired | $ 7,900,000 |  |  |  |  |  |
Net cash paid | 237,700,000 |  |  |  |  |  |
Working capital adjustment | (1,259,000) |  |  |  |  |  |
Purchase price paid | $ 246,801,000 |  |  |  |  |  |
FeedbackNow [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash acquired |  | $ 500,000 |  |  |  |  |
Net cash paid |  | 8,000,000 |  |  |  |  |
Working capital adjustment |  | 798,000 |  |  | 800,000 |  |
Purchase price paid |  | 8,425,000 |  |  | 500,000 |  |
Holdback amount expected to be paid |  | 1,485,000 |  |  |  |  |
Additional consideration paid to sellers based on financial performance |  |  | $ 1,800,000 |  |  |  |
Business acquisition undiscounted amounts could be payable, minimum |  | 0 |  |  |  |  |
Business acquisition undiscounted amounts could be payable, maximum |  | 2,500,000 |  |  | 4,300,000 |  | SFr 4,200,000
Contingent purchase price |  | $ 3,400,000 |  |  |  |  |
FeedbackNow [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Holdback amount expected to be paid |  |  |  | $ 1,000,000 |  |  |
FeedbackNow [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Additional consideration payable to sellers based on financial performance |  |  |  |  | $ 1,800,000 |  |
FeedbackNow [Member] | Maximum [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Additional consideration payable to sellers based on financial performance |  |  |  | $ 2,500,000 |  |  |

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