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Schedule of Gain on Disposition of Assets (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel | Mar. 31, 2014 USD ($) Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on vessels disposed | $ 6,692 | $ 5,883 | $ 6,111 | $ 7,351 | $ 10,704 | $ 4,699 | $ 4,500 | $ 3,893 | $ 26,037 | $ 23,796 | $ 21,063
Number of vessels disposed | Vessel |  |  |  |  |  |  |  |  | 17 | 13 | 48
Vessels |  |  |  |  |  |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on vessels disposed |  |  |  |  |  |  |  |  | $ 3,252 | $ 2,988 | $ 12,247

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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=51717284&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=51719941&loc=d3e2941-110230 + Details
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