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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration, Fair Value $ 36,515 $ 42,159
Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration, Fair Value 36,500 42,200
Undiscounted value of the payments on all contingencies 52,500 54,000
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Alternative to equity securities $ 82,400 $ 82,500