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Schedule of Gain on Disposition of Assets (Detail) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 USD ($) Vessel | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed | $ 24,099 | $ 26,037 | $ 23,796
Number of vessels disposed | Vessel | 12 | 17 | 13
Vessels |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed | $ (102) | $ 3,252 | $ 2,988

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 + Details
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