Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities, Noncurrent [Abstract]
Payroll taxes payable	$ 59,926	$ 41,355
Accrued compensation	284,349	278,399
Contingent consideration	17,496	32,065
Credit enhancement deposit	0	25,000
Financial guarantee liability	32,430	15
Other liabilities	$ 394,201	$ 376,834