Supplemental Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	[1]
Inventory [Line Items]
Inventory	$ 429,831	$ 355,126
Brineura Inventory
Inventory [Line Items]
Inventory	$ 22,700

[1] December 31, 2016 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, 2016, filed with the Securities and Exchange Commission (the SEC) on February 27, 2017.