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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 178,753		$ 406,520
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 151,369		$ 440,862		$ 601,611
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 26,860		$ 79,791
Percentage of Vessel revenue		16.00%		20.00%
Americas Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 21,617				$ 171,334
Percentage of Vessel revenue	15.00%				29.00%
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,835		$ 29,107
Percentage of Vessel revenue		8.00%		7.00%
Americas Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 15,021				$ 56,561
Percentage of Vessel revenue	10.00%				10.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 5,089		$ 9,636
Percentage of Vessel revenue		3.00%		2.00%
Americas Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,210				$ 11,948
Percentage of Vessel revenue	3.00%				2.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 45,784		$ 118,534
Percentage of Vessel revenue		27.00%		30.00%
Americas Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 40,848				$ 239,843
Percentage of Vessel revenue	28.00%				41.00%
Middle East/Asia Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 14,792		$ 35,479
Percentage of Vessel revenue		9.00%		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 Vessel 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		$ 44,722
Percentage of Vessel revenue		14.00%		10.00%
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 Vessel revenue	16.00%				13.00%
Middle East/Asia Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues				$ (6)
Middle East/Asia Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 39,845		$ 80,195
Percentage of Vessel revenue		23.00%		20.00%
Middle East/Asia Pacific Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 36,313				$ 114,618
Percentage of Vessel revenue	25.00%				19.00%
Europe/Mediterranean Sea fleet Deepwater vessals
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 18,204		$ 53,134
Percentage of Vessel revenue		10.00%		12.00%
Europe/Mediterranean Sea fleet Deepwater vessals | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 11,620				$ 39,492
Percentage of Vessel revenue	8.00%				7.00%
Africa/Europe Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 24,131		$ 58,641
Percentage of Vessel revenue		13.00%		14.00%
Africa/Europe Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 18,126				$ 62,882
Percentage of Vessel revenue	12.00%				11.00%
Europe/Mediterranean Sea fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 1,691		$ 3,129
Percentage of Vessel revenue		1.00%		1.00%
Europe/Mediterranean Sea fleet Towing-Supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 3,846				$ 2,659
Percentage of Vessel revenue	3.00%
Africa/Europe Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 33,806		$ 68,072
Percentage of Vessel revenue		20.00%		17.00%
Africa/Europe Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 31,297				$ 100,073
Percentage of Vessel revenue	21.00%				17.00%
Europe/Mediterranean Sea fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues					$ 516
Europe/Mediterranean Sea fleet Other | Predecessor | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of Vessel revenue					1.00%
Africa And Europe Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 8,423		$ 15,501
Percentage of Vessel revenue		5.00%		4.00%
Africa And Europe Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,547				$ 23,733
Percentage of Vessel revenue	3.00%				4.00%
Europe/Mediterranean Sea fleet:
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 19,895		$ 56,263
Percentage of Vessel revenue		11.00%		13.00%
Europe/Mediterranean Sea fleet: | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 15,466				$ 42,667
Percentage of Vessel revenue	11.00%				8.00%
Africa/Europe Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 66,360		$ 142,214
Percentage of Vessel revenue		39.00%		36.00%
Africa/Europe Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 53,970				$ 186,688
Percentage of Vessel revenue	36.00%				32.00%
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 83,987		$ 227,045
Percentage of Vessel revenue		49.00%		57.00%
Worldwide Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 64,731				$ 309,234
Percentage of Vessel revenue	44.00%				53.00%
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 74,385		$ 145,030
Percentage of Vessel revenue		43.00%		37.00%
Worldwide Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 73,109				$ 238,385
Percentage of Vessel revenue	50.00%				41.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,512		$ 25,131
Percentage of Vessel revenue		8.00%		6.00%
Worldwide Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 8,757				$ 36,197
Percentage of Vessel revenue	6.00%				6.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 171,884		$ 397,206
Percentage of Vessel revenue		100.00%		100.00%
Worldwide Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 146,597				$ 583,816
Percentage of Vessel revenue	100.00%				100.00%

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