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Summaries of Net Properties and Equipment (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Property, Plant and Equipment [Line Items]    
Vessels and related equipment $ 850,268  
Other properties and equipment 5,710  
Properties and equipment, gross 855,978  
Less accumulated depreciation and amortization 18,458  
Net properties and equipment $ 837,520  
Number Of Vessels | Vessel [1] 227  
Owned Vessels in Active Service    
Property, Plant and Equipment [Line Items]    
Net properties and equipment $ 632,978  
Number Of Vessels | Vessel [1] 138  
Stacked Vessels    
Property, Plant and Equipment [Line Items]    
Net properties and equipment $ 189,710  
Number Of Vessels | Vessel [1] 89  
Marine Equipment and Other Assets Under Construction    
Property, Plant and Equipment [Line Items]    
Net properties and equipment $ 9,501  
Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Net properties and equipment [2] $ 5,331  
Predecessor    
Property, Plant and Equipment [Line Items]    
Vessels and related equipment   $ 3,407,760
Other properties and equipment   69,670
Properties and equipment, gross   3,477,430
Less accumulated depreciation and amortization   612,668
Net properties and equipment   $ 2,864,762
Number Of Vessels | Vessel [1]   244
Predecessor | Owned Vessels in Active Service    
Property, Plant and Equipment [Line Items]    
Net properties and equipment   $ 1,990,049
Number Of Vessels | Vessel [1]   143
Predecessor | Stacked Vessels    
Property, Plant and Equipment [Line Items]    
Net properties and equipment   $ 793,606
Number Of Vessels | Vessel [1]   101
Predecessor | Marine Equipment and Other Assets Under Construction    
Property, Plant and Equipment [Line Items]    
Net properties and equipment   $ 53,611
Predecessor | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Net properties and equipment [2]   $ 27,496
[1] Vessel count excludes vessels operated under sale leaseback agreements.
[2] Other property and equipment at March 31, 2017 includes eight remotely operated vehicles, all of which were sold in December 2017.