Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets And Liabilities [Line Items]
Gross	$ 188,826	$ 152,498
Accumulated Amortization	59,666	52,287
Net Book Value	129,160	100,211
Product Rights
Finite-Lived Intangible Assets And Liabilities [Line Items]
Gross	167,694	138,466
Accumulated Amortization	56,233	49,796
Net Book Value	111,461	88,670
Customer Lists
Finite-Lived Intangible Assets And Liabilities [Line Items]
Gross	3,091	1,091
Accumulated Amortization	744	437
Net Book Value	2,347	654
Trademarks
Finite-Lived Intangible Assets And Liabilities [Line Items]
Gross	18,041	12,941
Accumulated Amortization	2,689	2,054
Net Book Value	$ 15,352	$ 10,887