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Schedule of Company's Obligations under Product Acquisition Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Beginning Balance | $ 17,624 | $ 12,822 | $ 1,200
Additional obligations acquired | 1,073 | 216 | 32,608
Addition of deferred liabilities |  | 6,802 |
Adjustment to deferred liabilities | (216) | (2,857) |
FX impact | 48 | 101 |
Amortization of discounted liabilities | 818 | 1,341 |
Payments on existing obligations | (7,447) | (801) | (20,986)
Ending Balance | $ 11,900 | $ 17,624 | $ 12,822

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