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Details of Number of Vessels, Total Proceeds, Carrying Values at the Time of Sale, Deferred Gains Recognized, Lease Expirations, and Contractual Purchase Option (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 USD ($) Vessel | Dec. 31, 2014 USD ($) Vessel | Sep. 30, 2014 USD ($) Vessel | Jun. 30, 2014 USD ($) Vessel | Mar. 31, 2014 USD ($) Vessel | Dec. 31, 2013 USD ($) Vessel | Sep. 30, 2013 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel | Mar. 31, 2014 USD ($) Vessel
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of Vessels | Vessel | 1 | 3 | 1 | 1 | 4 | 4 | 2 | 6 | 10
Total Proceeds | $ 13,000 | $ 78,200 | $ 19,350 | $ 13,400 | $ 63,305 | $ 141,900 | $ 65,550 | $ 123,950 | $ 270,755
Carrying Value at time of Sale | 5,115 | 33,233 | 8,214 | 4,002 | 32,845 | 105,649 | 34,325 | 50,564 | 172,819
Deferred Gain at time of Sale | $ 7,885 | $ 44,967 | $ 11,136 | $ 9,398 | $ 30,460 | $ 36,251 | $ 31,225 | $ 73,386 | $ 97,936
Lease Term in Years | 7 years |  | 8 years 6 months | 7 years |  |  | 7 years |  |
Purchase Option Percentage | 50.00% | 60.00% | 47.00% | 61.00% |  |  | 55.00% |  |
Purchase Option at at end of: | 6 years |  | 8 years | 6 years |  |  | 6 years |  |
Minimum |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |
Lease Term in Years |  | 8 years |  |  | 7 years | 7 years |  |  |
Purchase Option Percentage |  |  |  |  | 53.00% | 54.00% |  |  |
Purchase Option at at end of: |  | 7 years |  |  | 6 years | 6 years |  |  |
Maximum |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |
Lease Term in Years |  | 9 years |  |  | 10 years | 9 years |  |  |
Purchase Option Percentage |  |  |  |  | 59.00% | 68.00% |  |  |
Purchase Option at at end of: |  | 8 years |  |  | 9 years | 8 years |  |  |

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- Definition Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 + Details
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