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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) - Level 3 [Member] - Accounts Payable Accrued and Other Liabilities [Member] - Contingent Consideration [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]    
Opening Balance, Liabilities $ 42,159 $ 45,984
Total realized and unrealized (gains) losses included in Net income (loss), Liabilities 1,141 (1,482)
Unrealized (gains) losses included in Other comprehensive income (loss), Liabilities (59) (576)
Purchases/ Issuances, Liabilities 2,959  
Sales/ Settlements, Liabilities (5,327) (5,903)
Closing Balance, Liabilities 38,709 42,139
Unrealized (gains) losses for the period included in Net income (loss) on Level 3 Assets/Liabilities Outstanding 1,141  
Unrealized (gains) for the period included in Other Comprehensive income (loss) on Level 3 Assets/Liabilities Outstanding $ (59)  
Unrealized (gains) losses for the period on Level 3 Liabilities Outstanding   $ (2,058)