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Gain on Disposition of Assets, Net - Additional Information (Detail)
$ in Thousands
 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Vehicle
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Number of ROVs disposed | Vehicle   8    
Gain on dispositions of assets   $ 6,616    
Net properties and equipment   837,520 $ 837,520  
Other operating revenues   6,869    
Unamortized deferred gains credited to reorganization items on account of lease rejections     $ 105,900  
Date of petition for bankruptcy     May 17, 2017  
Subsea Business        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Other operating revenues   2,500    
Predecessor        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Gain on dispositions of assets $ 3,561     $ 24,099
Net properties and equipment       2,864,762
Other operating revenues 4,772     17,795
Amortized gains on sale/leaseback transactions 3,000     23,400
Predecessor | Subsea Business        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Other operating revenues 800     $ 3,200
ROVs        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Gain on dispositions of assets   $ 7,100    
Net properties and equipment $ 15,700