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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
Jun. 30, 2018
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     $ (436,403) $ (438,827)    
Warrants issued       924,125    
Additional paid-in capital     1,064,039 $ 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 Secured 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 [Member] | 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     $ 349,954 $ 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]            
Cash payment to General Unsecured Creditors 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        
Gain on settlement of Liabilities subject to compromise   (767,640)        
Prepaid expenses recognized prior to effective date 12,400          
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        
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 | Revolving Credit Facility            
Fresh Start Accounting [Line Items]            
Outstanding borrowing (600,000) (600,000)        
Restatement Adjustment | Senior Secured Notes            
Fresh Start Accounting [Line Items]            
Make-whole provision-Senior notes (94,726) (94,726)        
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]            
Gain on settlement of Liabilities subject to compromise   767,640        
Reclassification from current to long-term $ 10,409 $ 10,409        
Aggregate debt outstanding         $ (500,000)  
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 | 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]            
Reserved Creditor Warrants (3,859,361 Warrants at $25 per warrant) 5,510 5,510        
Successor | Reorganization Adjustments | Series B Warrants            
Fresh Start Accounting [Line Items]            
Reserved Creditor Warrants (3,859,361 Warrants at $25 per warrant) 4,945 4,945        
Successor | Reorganization Adjustments | Issued Creditor Warrants            
Fresh Start Accounting [Line Items]            
Reserved Creditor Warrants (3,859,361 Warrants at $25 per warrant) 192,108 192,108        
Successor | Reorganization Adjustments | Reserved Creditor Warrants            
Fresh Start Accounting [Line Items]            
Reserved Creditor Warrants (3,859,361 Warrants at $25 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.