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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References 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=66006027&loc=d3e16323-109275 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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