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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 105,601		$ 197,094
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 115,106		$ 275,855
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 22,661		$ 38,866
Percentage of Angolan operation revenue	22.00%		20.00%
Americas Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 17,313		$ 80,144
Percentage of Angolan operation revenue		15.00%		30.00%
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 7,560		$ 14,406
Percentage of Angolan operation revenue	7.00%		8.00%
Americas Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 11,274		$ 26,012
Percentage of Angolan operation revenue		10.00%		10.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 2,380		$ 5,410
Percentage of Angolan operation revenue	2.00%		3.00%
Americas Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 3,300		$ 6,264
Percentage of Angolan operation revenue		3.00%		2.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 32,601		$ 58,682
Percentage of Angolan operation revenue	31.00%		31.00%
Americas Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 31,887		$ 112,420
Percentage of Angolan operation revenue		28.00%		42.00%
Middle East/Asia Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 9,603		$ 19,167
Percentage of Angolan operation revenue	9.00%		10.00%
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 10,701		$ 20,134
Percentage of Angolan operation revenue		10.00%		7.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 12,783		$ 21,607
Percentage of Angolan operation revenue	12.00%		11.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 17,065		$ 34,310
Percentage of Angolan operation revenue		15.00%		13.00%
Middle East/Asia Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 20		$ 20
Middle East/Asia Pacific Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of Angolan operation revenue	1.00%		1.00%
Middle East/Asia Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 22,406		$ 40,794
Percentage of Angolan operation revenue	21.00%		21.00%
Middle East/Asia Pacific Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 27,766		$ 54,444
Percentage of Angolan operation revenue		25.00%		20.00%
Europe/Mediterranean Sea fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 12,596		$ 21,616
Percentage of Angolan operation revenue	12.00%		11.00%
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 8,237		$ 18,090
Percentage of Angolan operation revenue		8.00%		7.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 761		$ 1,364
Percentage of Angolan operation revenue	1.00%		1.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 2,794		$ 3,116
Percentage of Angolan operation revenue		2.00%		1.00%
Europe/Mediterranean Sea fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues				$ (9)
Europe/Mediterranean Sea fleet Other | Predecessor | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of Angolan operation revenue				1.00%
Europe/Mediterranean Sea fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 13,357		$ 22,980
Percentage of Angolan operation revenue	13.00%		12.00%
Europe/Mediterranean Sea fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 11,031		$ 21,197
Percentage of Angolan operation revenue		10.00%		8.00%
West Africa fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 14,314		$ 28,252
Percentage of Angolan operation revenue	14.00%		15.00%
West Africa fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,921		$ 27,100
Percentage of Angolan operation revenue		12.00%		10.00%
West Africa fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 17,321		$ 33,460
Percentage of Angolan operation revenue	17.00%		17.00%
West Africa fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 24,225		$ 46,697
Percentage of Angolan operation revenue		22.00%		17.00%
West Africa fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,175		$ 7,500
Percentage of Angolan operation revenue	4.00%		4.00%
West Africa fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 3,427		$ 7,304
Percentage of Angolan operation revenue		3.00%		3.00%
West Africa fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 35,810		$ 69,212
Percentage of Angolan operation revenue	35.00%		36.00%
West Africa fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 41,573		$ 81,101
Percentage of Angolan operation revenue		37.00%		30.00%
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 59,174		$ 107,901
Percentage of Angolan operation revenue	57.00%		56.00%
Worldwide Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 50,172		$ 145,468
Percentage of Angolan operation revenue		45.00%		54.00%
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 38,425		$ 70,837
Percentage of Angolan operation revenue	37.00%		37.00%
Worldwide Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 55,358		$ 110,135
Percentage of Angolan operation revenue		49.00%		41.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 6,575		$ 12,930
Percentage of Angolan operation revenue	6.00%		7.00%
Worldwide Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 6,727		$ 13,559
Percentage of Angolan operation revenue		6.00%		5.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 104,174		$ 191,668
Percentage of Angolan operation revenue	100.00%		100.00%
Worldwide Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 112,257		$ 269,162
Percentage of Angolan operation revenue		100.00%		100.00%

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