Quarterly report pursuant to Section 13 or 15(d)

Investments and Fair Value Measurements - Schedule of Changes in Fair Value of Estimated Contingent Consideration (Detail)

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Investments and Fair Value Measurements - Schedule of Changes in Fair Value of Estimated Contingent Consideration (Detail) - Level 3 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 18,588 $ 16,402 $ 16,402 $ 15,921
Payments of contingent consideration (260) (114) (3,370) (741)
Non-cash changes in fair value of estimated contingent consideration 1,600 2,300 670 1,222
Ending balance $ 19,928 $ 18,588 $ 17,228 $ 16,402