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Product Acquisitions - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Business | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Business | 2 |  |
Acquisitions of intangible assets | $ 36,667 |  |
Fair value increase (reduction) | 65 | $ (32) | $ (297)
Product acquisition and licensing agreements obligation, Other Liability | 2,035 |  |
Operating expenses |  |  |
Business Acquisition [Line Items] |  |  |
Fair value increase (reduction) | 65 | $ (32) | $ (297)
Product Rights |  |  |
Business Acquisition [Line Items] |  |  |
Acquisitions of intangible assets | $ 29,567 |  |
Expected useful life | 25 years |  |
Customer Lists |  |  |
Business Acquisition [Line Items] |  |  |
Acquisitions of intangible assets | $ 2,000 |  |
Expected useful life | 10 years |  |
Trademarks |  |  |
Business Acquisition [Line Items] |  |  |
Acquisitions of intangible assets | $ 5,100 |  |
Expected useful life | 25 years |  |

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