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Description of Basis of Consolidation and Presentation - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2015 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Settlement of fund for eligible participants | $ (12.3)

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration