Product Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Intangible assets acquired		$ 3,473	$ 316
Payment made toward Intangible Assets acquired during period		2,400
Acquisition cost associated with the product acquisition		7,447
Purchased product line			6,802
Fair value reduction	294	216	2,857
Product acquisition and licensing agreements obligation, Other Liability	3,886
Cost of Sales
Business Acquisition [Line Items]
Fair value reduction		0	495
Costs and Expenses
Business Acquisition [Line Items]
Fair value reduction	$ 294	$ 216	$ 2,362
Product Rights
Business Acquisition [Line Items]
Expected useful life	25 years
Customer Lists
Business Acquisition [Line Items]
Expected useful life	10 years
Trademarks
Business Acquisition [Line Items]
Expected useful life	25 years