Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross	$ 153,288	$ 149,933
Accumulated Amortization	39,767	33,744
Net Book Value	113,521	116,189
Product Rights
Finite-Lived Intangible Assets [Line Items]
Gross	139,256	135,901
Accumulated Amortization	38,530	33,130
Net Book Value	100,726	102,771
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross	1,091	1,091
Accumulated Amortization	218	109
Net Book Value	873	982
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross	12,941	12,941
Accumulated Amortization	1,019	505
Net Book Value	$ 11,922	$ 12,436

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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