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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 171,884
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 146,597		$ 583,816
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 26,860
Percentage of revenue		16.00%
Americas Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 21,617		$ 171,334
Percentage of revenue	15.00%		29.00%
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,835
Percentage of revenue		8.00%
Americas Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 15,021		$ 56,561
Percentage of revenue	10.00%		10.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 5,089
Percentage of revenue		3.00%
Americas Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,210		$ 11,948
Percentage of revenue	3.00%		2.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 45,784
Percentage of revenue		27.00%
Americas Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 40,848		$ 239,843
Percentage of revenue	28.00%		41.00%
Middle East/Asia Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 14,792
Percentage of revenue		9.00%
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 13,368		$ 35,526
Percentage of revenue	9.00%		6.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 25,053
Percentage of revenue		14.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 22,945		$ 79,092
Percentage of revenue	16.00%		13.00%
Middle East/Asia Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 39,845
Percentage of revenue		23.00%
Middle East/Asia Pacific Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 36,313		$ 114,618
Percentage of revenue	25.00%		19.00%
Africa/Europe Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 42,335
Percentage of revenue		24.00%
Africa/Europe Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 29,746		$ 102,374
Percentage of revenue	20.00%		18.00%
Africa/Europe Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 35,497
Percentage of revenue		21.00%
Africa/Europe Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 35,143		$ 102,732
Percentage of revenue	24.00%		18.00%
Africa And Europe Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 8,423
Percentage of revenue		5.00%
Africa And Europe Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,547		$ 24,249
Percentage of revenue	3.00%		4.00%
Africa/Europe Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 86,255
Percentage of revenue		50.00%
Africa/Europe Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 69,436		$ 229,355
Percentage of revenue	47.00%		40.00%
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 83,987
Percentage of revenue		49.00%
Worldwide Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 64,731		$ 309,234
Percentage of revenue	44.00%		53.00%
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 74,385
Percentage of revenue		43.00%
Worldwide Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 73,109		$ 238,385
Percentage of revenue	50.00%		41.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,512
Percentage of revenue		8.00%
Worldwide Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 8,757		$ 36,197
Percentage of revenue	6.00%		6.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 171,884
Percentage of revenue		100.00%
Worldwide Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 146,597		$ 583,816
Percentage of revenue	100.00%		100.00%

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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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