Other Current and Non-Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Current [Abstract]
Accrued accounts payable	$ 41,443	$ 22,669
Accrued compensation liability	52,495	41,554
Accrued restructuring liability		3,449
Contingent consideration payable	180,000	17,300
Accrued payable from acquisitions	30,000	35,000
Accrued lease incentive obligation		24,895
Value-added taxes payable	2,857	2,624
Other current liabilities	8,010	9,338
Total other current liabilities	$ 314,805	$ 156,829