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Schedule of Segment Reporting Information, Revenue by Vessel Class (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 and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 74,300 $ 99,192   $ 296,286
Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 36,263     $ 312,118  
Americas Fleet Deepwater vessels          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 9,798 [1] $ 19,513   $ 58,379 [1]
Percentage of Vessel revenue   14.00% [1] 20.00%   20.00% [1]
Americas Fleet Deepwater vessels | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 4,304     $ 84,448 [1]  
Percentage of Vessel revenue 12.00%     28.00% [1]  
Americas Fleet Towing-Supply/supply          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 5,572 $ 6,417   $ 20,824
Percentage of Vessel revenue   8.00% 7.00%   7.00%
Americas Fleet Towing-Supply/supply | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 3,747     $ 29,759  
Percentage of Vessel revenue 11.00%     10.00%  
Americas Fleet Other          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 2,079 $ 2,109   $ 7,518
Percentage of Vessel revenue   3.00% 2.00%   3.00%
Americas Fleet Other | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 910     $ 7,173  
Percentage of Vessel revenue 3.00%     2.00%  
Americas Fleet          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 17,449 $ 28,039   $ 86,721
Percentage of Vessel revenue   25.00% 29.00%   30.00%
Americas Fleet | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 8,961     $ 121,380  
Percentage of Vessel revenue 26.00%     40.00%  
Middle East/Asia Pacific Fleet Deepwater vessels          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 5,726 $ 7,607   $ 26,774
Percentage of Vessel revenue   8.00% 8.00%   9.00%
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 2,667     $ 22,801  
Percentage of Vessel revenue 8.00%     8.00%  
Middle East/Asia Pacific Fleet Towing-Supply/supply          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 10,943 $ 12,156   $ 33,762
Percentage of Vessel revenue   16.00% 12.00%   12.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 5,880     $ 40,190  
Percentage of Vessel revenue 17.00%     13.00%  
Middle East/Asia Pacific Fleet Other          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues     $ 164   $ 185
Middle East/Asia Pacific Fleet Other | Maximum          
Segment and Geographic Distribution of Operations [Line Items]          
Percentage of Vessel revenue     1.00%   1.00%
Middle East/Asia Pacific Fleet          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 16,669 $ 19,927   $ 60,721
Percentage of Vessel revenue   24.00% 20.00%   21.00%
Middle East/Asia Pacific Fleet | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 8,547     $ 62,991  
Percentage of Vessel revenue 25.00%     21.00%  
Europe/Mediterranean Sea fleet Deepwater vessels          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 7,810 $ 11,643   $ 33,260
Percentage of Vessel revenue   11.00% 12.00%   11.00%
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 3,383     $ 21,473  
Percentage of Vessel revenue 10.00%     7.00%  
Europe/Mediterranean Sea fleet Towing-Supply/supply          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 1,050 $ 923   $ 2,286
Percentage of Vessel revenue   1.00% 1.00%   1.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 1,052     $ 4,167  
Percentage of Vessel revenue 3.00%     1.00%  
Europe/Mediterranean Sea fleet Other | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues       $ (9)  
Europe/Mediterranean Sea fleet          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 8,860 $ 12,566   $ 35,546
Percentage of Vessel revenue   12.00% 13.00%   12.00%
Europe/Mediterranean Sea fleet | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 4,435     $ 25,631  
Percentage of Vessel revenue 13.00%     8.00%  
West Africa fleet Deepwater vessels          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 9,772 $ 15,101   $ 43,354
Percentage of Vessel revenue   14.00% 16.00%   15.00%
West Africa fleet Deepwater vessels | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 4,205     $ 31,306  
Percentage of Vessel revenue 12.00%     10.00%  
West Africa fleet Towing-Supply/supply          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 13,999 $ 17,805   $ 51,265
Percentage of Vessel revenue   20.00% 18.00%   18.00%
West Africa fleet Towing-Supply/supply | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 7,072     $ 53,769  
Percentage of Vessel revenue 21.00%     18.00%  
West Africa fleet Other          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 3,822 $ 3,573   $ 11,072
Percentage of Vessel revenue   5.00% 4.00%   4.00%
West Africa fleet Other | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 1,120     $ 8,424  
Percentage of Vessel revenue 3.00%     3.00%  
West Africa fleet          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 27,593 $ 36,479   $ 105,691
Percentage of Vessel revenue   39.00% 38.00%   37.00%
West Africa fleet | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 12,397     $ 93,499  
Percentage of Vessel revenue 36.00%     31.00%  
Worldwide Fleet Deepwater vessels          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 33,106 [1] $ 53,864   $ 161,767 [1]
Percentage of Vessel revenue   47.00% [1] 56.00%   55.00% [1]
Worldwide Fleet Deepwater vessels | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 14,559     $ 160,028 [1]  
Percentage of Vessel revenue 42.00%     53.00% [1]  
Worldwide Fleet Towing-Supply/supply          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 31,564 $ 37,301   $ 108,137
Percentage of Vessel revenue   45.00% 38.00%   38.00%
Worldwide Fleet Towing-Supply/supply | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 17,751     $ 127,885  
Percentage of Vessel revenue 52.00%     42.00%  
Worldwide Fleet Other          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 5,901 $ 5,846   $ 18,775
Percentage of Vessel revenue   8.00% 6.00%   7.00%
Worldwide Fleet Other | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 2,030     $ 15,588  
Percentage of Vessel revenue 6.00%     5.00%  
Worldwide Fleet          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues   $ 70,571 [1] $ 97,011   $ 288,679 [1]
Percentage of Vessel revenue   100.00% [1] 100.00%   100.00% [1]
Worldwide Fleet | Predecessor          
Segment and Geographic Distribution of Operations [Line Items]          
Vessel revenues $ 34,340     $ 303,501 [1]  
Percentage of Vessel revenue 100.00%     100.00% [1]  
[1] Included in Americas fleet deepwater, Worldwide fleet deepwater and Worldwide 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.