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Acquisitions - Transaction Related Expenses as Incurred (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Combinations [Abstract]        
Termination, restructuring, sale and strategic review costs $ 6,891 $ 5,329 $ 9,151 $ 10,941
Legal, accounting and other acquisition-related costs 1,612 235 8,142 1,451
Management transition costs   211   2,916
Transaction-related expenses $ 8,503 $ 5,775 $ 17,293 $ 15,308