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Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets and Goodwill (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Gross $ 279,538 $ 189,038
Accumulated Amortization 76,404 67,605
Net Book Value 203,134 121,433
Goodwill    
Finite Lived Intangible Assets [Line Items]    
Gross 22,184  
Net Book Value 22,184  
Product Rights    
Finite Lived Intangible Assets [Line Items]    
Gross 223,022 167,906
Accumulated Amortization 70,701 63,141
Net Book Value 152,321 104,765
Trademarks    
Finite Lived Intangible Assets [Line Items]    
Gross 27,541 18,041
Accumulated Amortization 4,233 3,411
Net Book Value 23,308 14,630
Customer Lists    
Finite Lived Intangible Assets [Line Items]    
Gross 6,791 3,091
Accumulated Amortization 1,470 1,053
Net Book Value $ 5,321 $ 2,038