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Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Deferred Consideration (Note 9) |  |  |  |
Beginning balance | $ 11,712 | $ 0 | $ 0 | $ 0
Purchases | 0 | 0 | 11,863 | 0
Net unrealized gains | 327 | 0 | 176 | 0
Ending balance | 12,039 | 0 | 12,039 | 0
Deferred Consideration Obligation [Member] |  |  |  |
Deferred Consideration (Note 9) |  |  |  |
Beginning balance | 242,767 | 226,706 | 228,062 | 230,137
Net realized losses | 4,105 | 4,250 | 13,001 | 12,834
Net unrealized gains | (77,895) | (1,737) | (63,188) | (5,066)
Settlements | (4,220) | (4,266) | (13,118) | (12,952)
Ending balance | $ 164,757 | $ 224,953 | $ 164,757 | $ 224,953

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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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