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Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Deferred consideration (Note 9) |  |
Beginning balance | $ 228,062 | $ 230,137
Net realized losses | 4,450 | 4,270
Net unrealized (gains)/losses | 17,018 | (2,832)
Settlements | (4,353) | (4,429)
Ending balance | 245,177 | 227,146
Deferred Consideration Obligation [Member] |  |
Deferred consideration (Note 9) |  |
Beginning balance | 0 | 0
Purchases | 6,863 | 0
Net unrealized (gains)/losses | (163) | 0
Ending balance | $ 6,700 | $ 0

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