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Acquisitions - Summary of Fair Value of Aggregate Consideration Payable (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
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Jul. 06, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Net cash paid |  |  | $ 237,684 | $ 9,250
FeedbackNow [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash acquired | $ 500 |  |  |
Net cash paid | 8,000 |  |  |
Indemnity holdback | 1,485 | $ 1,000 | 500 |
Contingent purchase price | 3,400 |  |  |
Purchase price paid | $ 8,425 | $ 2,700 | $ 1,800 |

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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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