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Supplemental Pro Forma Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Business Acquisition [Line Items] |  |  |
Product revenues | $ 170,846 | $ 413,131 | $ 325,084
Net income | $ 4,533 | $ 34,880 | $ 11,824

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