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Acquisitions - Transaction Related Expenses as Incurred (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Combinations [Abstract]        
Termination, restructuring and strategic review costs $ 5,541 $ 1,443 $ 13,858 $ 6,844
Legal, accounting and other acquisition-related costs 234 910 1,450 3,164
Transaction-related expenses $ 5,775 $ 2,353 $ 15,308 $ 10,008