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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of acquisition-related intangibles $ 48,430 $ 9,003 $ 143,964 $ 27,772