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v2.4.0.8

Segment Reporting - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2013 Segment
Segment Reporting Information [Line Items] |
Number of reportable segments | 4
Conventional tanker [Member] | Maximum [Member] |
Segment Reporting Information [Line Items] |
Operating lease arrangement period, lessee | 1 year
Conventional tanker [Member] | Minimum [Member] |
Segment Reporting Information [Line Items] |
Operating lease arrangement period, lessee | 1 year

X
- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration