Other Current and Non-Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Current [Abstract]
Accrued accounts payable	$ 59,475	$ 41,443
Accrued compensation liability	48,492	52,495
Contingent consideration payable	294,700	180,000
Accrued payable from acquisitions		30,000
Value-added taxes payable	5,232	2,857
Other current liabilities	16,979	8,010
Total other current liabilities	$ 424,878	$ 314,805