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Schedule of Gain on Disposition of Assets (Detail) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jul. 31, 2017 USD ($) Vessel	Dec. 31, 2017 USD ($) Vessel	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain (loss) on vessels disposed	$ 1,338			$ 6,616	$ 3,257
Number of vessels disposed | Vessel				11
Predecessor
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain (loss) on vessels disposed		$ 3,189	$ 3,561			$ 9,253	$ 24,099
Number of vessels disposed | Vessel			7				12
Vessels
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain (loss) on vessels disposed				$ (163)
Vessels | Predecessor
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain (loss) on vessels disposed			$ 509				$ (102)

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Number of Vessels Sold or Scrapped

+ References

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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=109223946&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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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