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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2014 USD ($) | Apr. 30, 2014 Vessel | Mar. 31, 2014 USD ($) Vessel | Oct. 31, 2012 USD ($) | Sep. 30, 2012 USD ($) | Jul. 31, 2009 Vessel Entity | Jun. 30, 2009 Vessel Entity | Mar. 31, 2006 USD ($) Lease Vessel | Mar. 31, 2015 USD ($) 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 | Mar. 31, 2010 USD ($) | Mar. 31, 2006 Lease
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | Vessel |  | 2 | 3 |  |  | 6 | 6 |  | 1 | 3 | 1 | 1 | 4 | 4 | 2 | 6 | 10 |  |
Number of unrelated third-party companies | Entity |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | $ 76,500 | $ 13,000 | $ 78,200 | $ 19,350 | $ 13,400 | $ 63,305 | $ 141,900 | $ 65,550 | $ 123,950 | $ 270,755 | $ 101,800 |
Deferred gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,600 |
Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,200 |
Charter hire operating lease terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Repurchase of leased vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 78,800 |  |
Number of vessels to be sold that are under construction | Vessel |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Number of Operating Lease | Lease |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  | 5
Length of extension period, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years
Third and Fourth PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  | $ 22,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fifth Vessel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels | $ 11,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  |  |  | $ 8,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  |  | $ 8,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
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- Definition Amount of cash inflow before closing and deferred financing 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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