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Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross $ 153,126 $ 153,288
Accumulated Amortization 46,119 39,767
Net Book Value 107,007 113,521
Product Rights
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross 139,094 139,256
Accumulated Amortization 44,254 38,530
Net Book Value 94,840 100,726
Customer Lists
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross 1,091 1,091
Accumulated Amortization 328 218
Net Book Value 763 873
Trademarks
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross 12,941 12,941
Accumulated Amortization 1,537 1,019
Net Book Value $ 11,404 $ 11,922