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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.

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