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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accounts payable $ 48,982 $ 38,598
Accrued salaries and bonuses 131,739 223,815
Accrued payroll taxes and benefits 43,087 61,130
Accrued professional liabilities 57,466 44,869
Accrued interest 32,679 32,910
Other accrued expenses 46,956 51,788
Accounts payable and accrued expenses, total $ 360,909 $ 453,110