Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities, Noncurrent [Abstract]
Accrued compensation	$ 292,141		$ 278,399
Payroll taxes payable	62,650		41,355
Contingent consideration	13,831		32,065
Credit enhancement deposit	0		25,000
Financial guarantee liability	32,652	$ 32,430	15
Other liabilities	$ 401,274		$ 376,834