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Summary of Unaudited Condensed Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 4 Months Ended
Jul. 31, 2017
Jul. 31, 2017
Jul. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Fresh Start Accounting [Line Items]          
Amounts payable to holders of General Unsecured Claims at July 31, 2017 $ 102,193 $ 102,193 $ 102,193    
Total payments pursuant to the Plan 225,000 225,000 225,000    
Postconfirmation cash upon full payment 458,700 458,700 458,700    
Aggregate principal amount 350,000 350,000 350,000    
Amount outstanding       $ (450,851)  
Warrants issued       410,262  
Additional paid-in capital       $ 1,056,563  
Reduction in carrying value of receivable related to vessel [1] 480 480 480    
Decrease in Noncontrolling interests [2] $ 13,266 $ 13,266 $ 13,266    
Series A Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 2,400,000 2,400,000 2,400,000    
Nominal exercise price of warrants $ 57.06 $ 57.06 $ 57.06    
Series B Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 2,600,000 2,600,000 2,600,000    
Nominal exercise price of warrants $ 62.28 $ 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 25    
Reorganization Adjustments | New Creditor Warrant          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants 25 25 25    
Reorganization Adjustments | New Creditor Warrant | Common stock          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants $ 0.001 $ 0.001 $ 0.001    
Reorganization Adjustments | Series A          
Fresh Start Accounting [Line Items]          
Shares issued 2,400,000        
Warrants issued 2,400,000 2,400,000 2,400,000    
Nominal exercise price of warrants $ 2.27 $ 2.27 $ 2.27    
Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Shares issued 2,600,000        
Warrants issued 2,600,000 2,600,000 2,600,000    
Nominal exercise price of warrants $ 1.88 $ 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 $ 1,300    
Intangible liability 2,100 2,100 2,100    
Current intangible liability $ 400 400 400    
Amortization of intangible liability contract 2023        
Write-off of deferred rent and unrecognized deferred gain $ 3,800 3,800 3,800    
Write-off of current deferred rent and unrecognized deferred gain 400 400 400    
Fresh-start accounting deferred tax current 900 900 900    
Fresh-start accounting deferred tax long-term 1,300 1,300 1,300    
Write-off of unamortized debt issuance costs 900        
Decrease in Noncontrolling interests 13,300 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 800 800 800    
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 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 3,800    
Carrying value of receivable after fair value adjustment 1,800 1,800 1,800    
Senior Notes | Fresh-start Accounting Adjustments | Troms Offshore borrowings          
Fresh Start Accounting [Line Items]          
Aggregate discount recorded $ 5,400 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        
New Secured Notes          
Fresh Start Accounting [Line Items]          
Aggregate principal amount $ 350,000 350,000 350,000    
New secured notes [3]       350,000  
Premium recorded       $ 14,987  
New Secured Notes | Fresh-start Accounting Adjustments          
Fresh Start Accounting [Line Items]          
New secured notes 350,000 350,000 350,000    
Premium recorded 15,400 15,400 15,400    
Restatement Adjustment          
Fresh Start Accounting [Line Items]          
Payment made to holders of General Unsecured Claims upon emergence 122,807 122,807 122,807    
Amounts payable to holders of General Unsecured Claims at July 31, 2017 102,193 102,193 102,193    
Total payments pursuant to the Plan 225,000 225,000 225,000    
Prepaid expenses recognized prior to emergence date 12,400        
Aggregate principal amount 350,000 350,000 350,000    
Accrued interest payable (23,736) (23,736) (23,736)    
Lessor claims - sale leaseback agreements (260,160) (260,160) (260,160)    
Total liabilities subject to compromise (2,326,122) (2,326,122) (2,326,122)    
Fair value of equity and warrants issued to General Unsecured Creditors 983,482 983,482 983,482    
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) (300,000)    
Restatement Adjustment | September 2013 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (500,000) (500,000) (500,000)    
Restatement Adjustment | August 2011 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (165,000) (165,000) (165,000)    
Restatement Adjustment | September 2010 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding (382,500) (382,500) (382,500)    
Restatement Adjustment | Senior Notes          
Fresh Start Accounting [Line Items]          
Make-whole provision - Senior notes (94,726) (94,726) (94,726)    
Restatement Adjustment | Revolving Credit Facility          
Fresh Start Accounting [Line Items]          
Outstanding borrowing (600,000) (600,000) (600,000)    
Restatement Adjustment | New Secured Notes          
Fresh Start Accounting [Line Items]          
Reclassification from current to long-term 5,200 5,200 5,200    
Aggregate principal amount 350,000 350,000 350,000    
Predecessor          
Fresh Start Accounting [Line Items]          
Reclassification from current to long-term $ 10,409 10,409 10,409    
Amount outstanding         $ (2,040,525)
Gain on settlement of Liabilities subject to compromise   $ (767,640) $ (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 $ 57.06    
Predecessor | Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Nominal exercise price of warrants $ 62.28 $ 62.28 $ 62.28    
Predecessor | Term Loan Facility          
Fresh Start Accounting [Line Items]          
Amount outstanding [3]         (300,000)
Predecessor | September 2013 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding [3]         (500,000)
Predecessor | August 2011 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding [3]         (165,000)
Predecessor | September 2010 Senior Unsecured Notes          
Fresh Start Accounting [Line Items]          
Aggregate debt outstanding [3]         (382,500)
Predecessor | Revolving Credit Facility          
Fresh Start Accounting [Line Items]          
Outstanding borrowing [3],[4]         $ (600,000)
Successor          
Fresh Start Accounting [Line Items]          
Carrying value of receivable after fair value adjustment $ 116,496 $ 116,496 $ 116,496    
Successor | Reorganization Adjustments          
Fresh Start Accounting [Line Items]          
Additional paid-in capital 756,346 756,346 756,346    
Fair Value of Successor additional paid-in capital 1,055,391 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 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 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) 192,108 192,108 192,108    
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 $ 96,482    
Successor | Reorganization Adjustments | Series A          
Fresh Start Accounting [Line Items]          
Warrants issued 2,432,432 2,432,432 2,432,432    
Nominal exercise price of warrants $ 1.88 $ 1.88 $ 1.88    
Successor | Reorganization Adjustments | Series B          
Fresh Start Accounting [Line Items]          
Warrants issued 2,629,657 2,629,657 2,629,657    
Nominal exercise price of warrants $ 2.27 $ 2.27 $ 2.27    
Successor | Reorganization Adjustments | Issued Creditor Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 7,684,453 7,684,453 7,684,453    
Nominal exercise price of warrants $ 25 $ 25 $ 25    
Successor | Reorganization Adjustments | Reserved Creditor Warrants          
Fresh Start Accounting [Line Items]          
Warrants issued 3,859,361 3,859,361 3,859,361    
Nominal exercise price of warrants $ 25 $ 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.
[3] As of September 30, 2017 the fair value (Level 2) of the New Secured Notes was $357.7 million. As of March 31, 2017 the aggregate fair value (Level 2) of the term loan, revolver and senior notes was $1.1 billion.
[4] The revolver was fully drawn at March 31, 2017.