Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Reconciliation of Contingent Consideration Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Schedule of Reconciliation of Contingent Consideration Measured at Fair Value on Recurring Basis (Detail) - Contingent Consideration [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance $ 5,572 $ 3,387
Contingent consideration in connection with acquisitions (100) 1,800
Change in fair value of contingent consideration 3,246 134
Payments of contingent consideration (620) (638)
Ending balance $ 8,098 $ 4,683