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Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 46,537 $ 49,877
Work-in-process 234,370 234,674
Finished goods 192,449 191,224
Total inventory $ 473,356 $ 475,775 [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.