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v2.4.1.9

Segment Reporting - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2015 Segment
Number of reportable business segments | 1 us-gaap_NumberOfReportableSegments

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration