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Summary of Net Properties and Equipment (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Property, Plant and Equipment [Line Items]      
Vessels and related equipment $ 836,773 $ 850,268  
Other properties and equipment 5,481 5,710  
Properties and equipment, gross 842,254 855,978  
Less accumulated depreciation and amortization 38,529 18,458  
Net properties and equipment $ 803,725 $ 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.