Accounts Payable, Accrued, and Other Liabilities (Detail) - Accounts Payable and Accrued Liabilities - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 31,570	$ 16,802
Payroll and employee benefits payable	85,575	79,831
Severance and retention bonus payable	38,557	26,965
Bonus payable	90,989	83,000
Commissions payable	66,054	64,888
Taxes payable	13,714	18,538
Professional, consulting, audit fees	10,164	9,429
Other accrued liabilities	51,068	54,308
Total accounts payable and accrued liabilities	$ 387,691	$ 353,761