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Summary of Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 4 Months Ended
Jul. 31, 2017
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Sep. 30, 2013
Fresh Start Accounting [Line Items]          
Amounts payable to holders of General Unsecured Claims at July 31, 2017 $ 102,193 $ 102,193      
Total payments pursuant to the Plan 225,000 225,000      
Postconfirmation cash upon full payment 458,700 458,700      
Aggregate principal amount 350,000 350,000      
Amount outstanding     $ (448,160)    
Warrants issued     924,125    
Additional paid-in capital     $ 1,059,120    
Reduction in carrying value of receivable related to vessel [1] 480 480      
Decrease in Noncontrolling interests [2] $ 13,266 $ 13,266      
Series A Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 2,400,000 2,400,000      
Nominal exercise price of warrants $ 57.06 $ 57.06      
Series B Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 2,600,000 2,600,000      
Nominal exercise price of warrants $ 62.28 $ 62.28      
Reorganization Adjustments          
Fresh Start Accounting [Line Items]          
Shares issued 18,500,000        
Reorganization Adjustments | Common stock          
Fresh Start Accounting [Line Items]          
Per share value $ 25 25      
Reorganization Adjustments | New Creditor Warrant          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants $ 25 $ 25      
Reorganization Adjustments | Series A          
Fresh Start Accounting [Line Items]          
Warrants issued 2,400,000 2,400,000      
Nominal exercise price of warrants $ 2.27 $ 2.27      
Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Warrants issued 2,600,000 2,600,000      
Nominal exercise price of warrants $ 1.88 $ 1.88      
Fresh-start Accounting Adjustments          
Fresh Start Accounting [Line Items]          
Fair value discount rate 12.00%        
Write-off of accrued losses $ 1,300 $ 1,300      
Intangible liability 2,100 2,100      
Current intangible liability $ 400 400      
Amortization of intangible liability contract 2023        
Write-off of deferred rent and unrecognized deferred gain $ 3,800 3,800      
Write-off of current deferred rent and unrecognized deferred gain 400 400      
Fresh-start accounting deferred tax current 900 900      
Fresh-start accounting deferred tax long-term 1,300 1,300      
Write-off of unamortized debt issuance costs 900        
Decrease in Noncontrolling interests 13,300 13,300      
Fresh-start Accounting Adjustments | Reclassification of Construction in Progress to Other Non-Current Assets          
Fresh Start Accounting [Line Items]          
Fresh-start accounting deferred tax 800 800      
Fresh-start Accounting Adjustments | Reclassification of Construction in Progress to Other Non-Current Assets | United States          
Fresh Start Accounting [Line Items]          
Reduction in carrying value of vessel 41,700 41,700      
Fresh-start Accounting Adjustments | Reclassification of Construction in Progress to Other Non-Current Assets | Brazil          
Fresh Start Accounting [Line Items]          
Reduction in carrying value of receivable related to vessel 3,800 3,800      
Carrying value of receivable after fair value adjustment 1,800 1,800      
September 2013 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Make-whole provision - Senior notes         $ (500,000)
Senior Notes | Fresh-start Accounting Adjustments | Troms Offshore Supply AS          
Fresh Start Accounting [Line Items]          
Aggregate discount recorded $ 5,400 5,400      
General Unsecured Creditors | Reorganization Adjustments          
Fresh Start Accounting [Line Items]          
Shares issued 17,000,000        
General Unsecured Creditors | Reorganization Adjustments | New Creditor Warrant          
Fresh Start Accounting [Line Items]          
Shares issued 7,700,000        
Unresolved Sale Leaseback Claim | Reorganization Adjustments | New Creditor Warrant          
Fresh Start Accounting [Line Items]          
Shares issued 3,900,000        
8.00% New Secured Notes Due August 2022          
Fresh Start Accounting [Line Items]          
Aggregate principal amount $ 350,000 350,000      
New secured notes     $ 350,000    
8.00% New Secured Notes Due August 2022 | Fresh-start Accounting Adjustments          
Fresh Start Accounting [Line Items]          
New secured notes 15,400 15,400      
Premium recorded 350,000 350,000      
Restatement Adjustment          
Fresh Start Accounting [Line Items]          
Payment made to holders of General Unsecured Claims upon emergence 122,807 122,807      
Amounts payable to holders of General Unsecured Claims at July 31, 2017 102,193 102,193      
Total payments pursuant to the Plan 225,000 225,000      
Prepaid expenses recognized prior to effective date 12,400        
Aggregate principal amount 350,000 350,000      
Accrued interest payable (23,736) (23,736)      
Lessor claims - sale leaseback agreements (260,160) (260,160)      
Total liabilities subject to compromise (2,326,122) (2,326,122)      
Fair value of equity and warrants issued to General Unsecured Creditors 983,482 983,482      
Gain on settlement of Liabilities subject to compromise (767,640)        
Restatement Adjustment | Term Loan Facility          
Fresh Start Accounting [Line Items]          
Amount outstanding (300,000) (300,000)      
Restatement Adjustment | September 2013 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (500,000) (500,000)      
Restatement Adjustment | August 2011 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (165,000) (165,000)      
Restatement Adjustment | September 2010 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (382,500) (382,500)      
Restatement Adjustment | Senior Notes          
Fresh Start Accounting [Line Items]          
Make-whole provision - Senior notes (94,726) (94,726)      
Restatement Adjustment | Revolving Credit Facility          
Fresh Start Accounting [Line Items]          
Outstanding borrowing (600,000) (600,000)      
Restatement Adjustment | 8.00% New Secured Notes Due August 2022          
Fresh Start Accounting [Line Items]          
Reclassification from current to long-term 5,200 5,200      
Aggregate principal amount 350,000 350,000      
Predecessor          
Fresh Start Accounting [Line Items]          
Reclassification from current to long-term $ 10,409 10,409      
Amount outstanding       $ (2,040,525)  
Gain on settlement of Liabilities subject to compromise   $ (767,640)      
Additional paid-in capital       165,221  
Predecessor | Reorganization Adjustments          
Fresh Start Accounting [Line Items]          
Shares issued 1,500,000        
Predecessor | Reorganization Adjustments | Series A          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants $ 57.06 $ 57.06      
Predecessor | Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants $ 62.28 $ 62.28      
Predecessor | September 2013 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding       (500,000)  
Predecessor | August 2011 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding       (165,000)  
Predecessor | September 2010 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding       $ (382,500)  
Successor          
Fresh Start Accounting [Line Items]          
Carrying value of receivable after fair value adjustment $ 116,496 $ 116,496      
Successor | Reorganization Adjustments          
Fresh Start Accounting [Line Items]          
Additional paid-in capital 756,346 756,346      
Fair Value of Successor additional paid-in capital 1,055,391 1,055,391      
Successor | Reorganization Adjustments | Series A Warrants          
Fresh Start Accounting [Line Items]          
Series A Warrants (2,432,432 Warrants at $1.88 per warrant) 5,510 5,510      
Successor | Reorganization Adjustments | Series B Warrants          
Fresh Start Accounting [Line Items]          
Series A Warrants (2,432,432 Warrants at $1.88 per warrant) 4,945 4,945      
Successor | Reorganization Adjustments | Issued Creditor Warrants          
Fresh Start Accounting [Line Items]          
Series A Warrants (2,432,432 Warrants at $1.88 per warrant) 192,108 192,108      
Successor | Reorganization Adjustments | Reserved Creditor Warrants          
Fresh Start Accounting [Line Items]          
Series A Warrants (2,432,432 Warrants at $1.88 per warrant) $ 96,482 $ 96,482      
Successor | Reorganization Adjustments | Series A          
Fresh Start Accounting [Line Items]          
Warrants issued 2,432,432 2,432,432      
Nominal exercise price of warrants $ 1.88 $ 1.88      
Successor | Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Warrants issued 2,629,657 2,629,657      
Nominal exercise price of warrants $ 2.27 $ 2.27      
Successor | Reorganization Adjustments | Issued Creditor Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 7,684,453 7,684,453      
Nominal exercise price of warrants $ 25 $ 25      
Successor | Reorganization Adjustments | Reserved Creditor Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 3,859,361 3,859,361      
Nominal exercise price of warrants $ 25 $ 25      
[1] Represents fair value adjustments on outstanding warranty claims.
[2] Reflects a $13.3 million adjustment to decrease the carrying value of the noncontrolling interests to the estimated fair value.