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Schedule of Gain (loss) on Disposition of Assets (Detail) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2019 USD ($) Vessel | Dec. 31, 2018 USD ($) Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Gain (losses) on vessels disposed | $ 3,561 | $ 6,616 | $ 2,263 | $ 10,624
Number of vessels disposed | Vessel | 7 | 11 | 40 | 38
Vessels |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Gain (losses) on vessels disposed | $ 509 | $ (163) | $ 2,434 | $ 10,935

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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