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Schedule of Segment Reporting Information, Revenue by Vessel (Detail) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jul. 31, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 105,601			$ 178,753	$ 197,094
Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues	104,174			$ 171,884	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	$ 151,369			$ 275,855	$ 601,611
Predecessor | Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues		112,257	$ 146,597			269,162	$ 583,816
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

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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
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-Name Accounting Standards Codification
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