Accounts Payable, Accrued Expenses and Other Liabilities - Components of Current Portion of Accounts Payable, Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts Payable Accrued Expenses And Other Liabilities Current [Abstract]
Accounts payable and accrued expenses	$ 124,905	$ 189,172
Payroll taxes payable	46,993	45,612
Derivative liability	51,731	25,661
Outside broker payable	56,463	74,280
Credit enhancement deposit	25,000	0
Corporate taxes payable	16,720	69,237
Contingent consideration	19,736	13,107
Total	$ 341,548	$ 417,069