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Summary of Impairments (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Vessel	Mar. 31, 2020 USD ($) Vessel	Jun. 30, 2020 USD ($) Vessel
Asset Impairment Charges [Abstract]
Beginning balance | Vessel	38	46	46
Additions | Vessel	22		22
Sales | Vessel	(14)	(8)	(22)
Ending balance | Vessel	46	38	46
Beginning balance	$ 26,142	$ 39,287	$ 39,287
Additions	15,930		15,930
Sales	(7,407)	(2,938)	(10,345)
Additional impairment	(5,601)	(10,207)	(15,808)
Ending balance	$ 29,064	$ 26,142	$ 29,064

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Assets held for sale not part of disposal group current sales.

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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

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