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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration, Fair Value $ 42,159 $ 45,984
Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration, Fair Value 42,200 46,000
Undiscounted value of the payments on all contingencies 54,000 66,100
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Alternative to equity securities $ 82,500 $ 55,800