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Fair Value Measurements and Investments - Schedule of Reconciliation For Contingent Consideration Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Contingent consideration at January 1 $ 42,700 $ 28,560
Increase (decrease) in fair value recognized in acquisition-related amortization and remeasurement (9,000) 5,400
Payment made   (15,000)
Contingent consideration at March 31 $ 33,700 $ 18,960