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Schedule of Segment Reporting Information, Revenue by Vessel (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 105,601		$ 197,094
Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues	104,174		191,668
Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues	32,601		58,682
Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	22,406		40,794
Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues	13,357		22,980
Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues	$ 35,810		$ 69,212
Predecessor
Segment Reporting Information [Line Items]
Total revenues		$ 115,106		$ 275,855
Predecessor | Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues		112,257		269,162
Predecessor | Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues		31,887		112,420
Predecessor | Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues		27,766		54,444
Predecessor | Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues		11,031		21,197
Predecessor | Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues		$ 41,573		$ 81,101

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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