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Schedule of Segment Reporting Information, Revenue by Vessel (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended		3 Months Ended	7 Months Ended		9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017		Sep. 30, 2018	Jul. 31, 2017		Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues		$ 74,300		$ 99,192			$ 296,286
Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues		70,571		97,011			288,679
Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues		17,449	[1]	28,039			86,721	[1]
Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues		16,669		19,927			60,721
Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues		8,860		12,566			35,546
Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues		$ 27,593		$ 36,479			$ 105,691
Predecessor
Segment Reporting Information [Line Items]
Total revenues	$ 36,263				$ 312,118
Predecessor | Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues	34,340				303,501
Predecessor | Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues	8,961				121,380	[1]
Predecessor | Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	8,547				62,991
Predecessor | Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues	4,435				25,631
Predecessor | Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues	$ 12,397				$ 93,499
[1] Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.

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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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