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Business Combinations - Schedule of Acquisition Related (Income) Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Combinations [Abstract]    
Acquisition and integration expenses $ 15,487 $ 248
Change in fair value of contingent consideration (46,914)  
Total $ (31,427) $ 248