Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Accounts payable and accrued operating expenses	$ 166,416	$ 166,616
Accrued compensation expense	94,954	140,781
Accrued rebates payable	50,944	36,472
Accrued royalties payable	18,620	18,820
Value added taxes payable	9,191	9,740
Forward foreign currency exchange contracts	7,165	14,464
Accrued income taxes	2,658	5,528
Other	8,784	9,500
Total accounts payable and accrued liabilities	$ 358,732	$ 401,921	[1]

[1] December 31, 2017 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 26, 2018.