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Summary of Impairments (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2019 USD ($) Vessel | Dec. 31, 2018 USD ($) Vessel
Asset Impairment Charges [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels impaired during the period | Vessel |  |  |  |  |  |  |  |  |  | 79 | 5 | 35 | 56
Amount of impairment and other expense incurred | $ | $ 21,325 | $ 32,549 | $ 5,224 | $ 36,878 | $ 16,853 | $ 1,215 | $ 6,186 | $ 16,777 | $ 163,423 | $ 184,748 | $ 16,777 | $ 37,773 | $ 61,132

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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