Supplemental Balance Sheet Information - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable and accrued operating expenses	$ 226,769	$ 207,620
Accrued compensation expense	132,049	149,937
Accrued rebates payable	55,957	43,116
Accrued royalties payable	27,881	19,977
Value added taxes payable	7,556	7,785
Forward foreign currency exchange contracts	8,731	4,178
Lease liability	10,225	0
Other	14,577	4,677
Total accounts payable and accrued liabilities	$ 483,745	$ 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.