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Schedule of Segment Reporting Information, Revenue by Vessel (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Vessel revenues	$ 87,494
Predecessor
Segment Reporting Information [Line Items]
Vessel revenues		$ 156,905
Americas
Segment Reporting Information [Line Items]
Vessel revenues	26,081
Americas | Predecessor
Segment Reporting Information [Line Items]
Vessel revenues		80,533
Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Vessel revenues	18,388
Middle East/Asia Pacific | Predecessor
Segment Reporting Information [Line Items]
Vessel revenues		26,678
Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Vessel revenues	9,623
Europe/Mediterranean Sea | Predecessor
Segment Reporting Information [Line Items]
Vessel revenues		10,166
West Africa
Segment Reporting Information [Line Items]
Vessel revenues	$ 33,402
West Africa | Predecessor
Segment Reporting Information [Line Items]
Vessel revenues		$ 39,528

X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

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.

+ References

No definition available.

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