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Summary of Impairments (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) Vessel | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) Vessel
Asset Impairment Charges [Abstract] |  |  |  |  |
Number of vessels impaired in the period | Vessel |  |  | 15 |  | 30
Amount of impairment incurred | $ | [1] | $ 5,224 | $ 16,853 | $ 5,224 | $ 24,254
[1] | Refer to Note (14) for additional information regarding asset impairment charges.

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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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