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Schedule of Company's Obligations under Product Acquisition Agreements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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