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Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) - Deferred Consideration Obligation [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 226,706 | $ 198,784 | $ 230,137 | $ 173,024
Net realized losses/(gains) | 4,250 | 4,539 | 12,834 | 12,362
Net unrealized (gains)/losses | (1,737) | 8,870 | (5,066) | 34,436
Settlements | (4,266) | (4,445) | (12,952) | (12,074)
Ending balance | $ 224,953 | $ 207,748 | $ 224,953 | $ 207,748

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