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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of acquisition-related intangibles $ 47,909 $ 9,584 $ 95,534 $ 18,769