Supplemental Balance Sheet Information - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable and accrued operating expenses	$ 223,947	$ 207,620
Accrued compensation expense	101,111	149,937
Accrued rebates payable	49,183	43,116
Accrued royalties payable	23,059	19,977
Value added taxes payable	9,196	7,785
Forward foreign currency exchange contracts	6,423	4,178
Lease liability	10,165	0
Other	6,418	4,677
Total accounts payable and accrued liabilities	$ 429,502	$ 437,290	[1]

[1] December 31, 2018 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, 2018, filed with the SEC on February 28, 2019.