Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration, Fair Value	$ 40,056	$ 39,791
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration, Fair Value	40,100	39,800
Undiscounted value of the payments on all contingencies	50,300	53,400
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Alternative to equity securities	$ 82,100	$ 83,000