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Income Taxes - Additional Information (Detail) - USD ($)
 1 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
Income Tax [Line Items]        
Federal statutory tax rate   35.00%    
Cancellation of indebtedness (COD) income $ 853,000,000      
Total amount of reduction of tax attributes 806,000,000      
Net operating losses and depreciable assets 518,000,000      
Attribute reduction in stock of foreign subsidiaries 288,000,000      
Excess COD income attributed to subsidiaries 37,000,000      
Deferred tax recognized on excess COD income 10,000,000      
Reduced in net operating loss carryforwards   $ 201,100,000    
Valuation allowance   43,218,000   $ 2,300,000
Unrecognized deferred tax liability for temporary differences related to investments in foreign subsidiaries estimated amount   4,000,000    
Income tax penalties and interest   9,800,000    
Net impact in income loss   0    
Reduction in net deferred tax asset   27,300,000    
Recognized provisional deemed dividend   43,200,000    
Scenario Plan        
Income Tax [Line Items]        
Federal statutory tax rate     21.00%  
Federal NOL        
Income Tax [Line Items]        
Net operating loss ("NOL") carryforwards   215,600,000   47,600,000
Foreign NOL        
Income Tax [Line Items]        
Tax credit   $ 2,300,000   $ 2,300,000
Tax credit year expire, start year   2026    
Tax credit year expire, end year   2027    
Domestic Subsidiaries        
Income Tax [Line Items]        
Excess COD income attributed to subsidiaries 47,000,000      
Deferred tax recognized on excess COD income $ 0      
Intercompany Vessel Sales        
Income Tax [Line Items]        
Remaining unamortized amount   $ 0