Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Accounts payable and accrued operating expenses	$ 179,294	$ 139,513
Accrued income taxes	59,572
Accrued compensation expense	78,424	45,479
Accrued vacation expense	16,921	12,540
Accrued rebates payable	32,553	14,859
Accrued royalties payable	10,412	9,050
Value added taxes payable	6,377	5,479
Other	8,958	4,924
Total accounts payable and accrued liabilities	$ 392,511	$ 231,844