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Summary of Consolidated Balance Sheet (Parenthetical) (Detail)
$ / shares in Units, $ in Thousands
 4 Months Ended 5 Months Ended
Jul. 31, 2017
USD ($)
$ / shares
shares
Jul. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 01, 2018
USD ($)
Aug. 01, 2017
USD ($)
$ / shares
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            
Reclassification from current to long-term 10,409 10,409            
Amount outstanding       $ (297,659)   $ (431,456)    
Gain on settlement of Liabilities subject to compromise   (767,640)            
Number of shares of Tidewater Series warrants held by 401(k) plan | shares     924,125          
Additional paid-in capital       1,367,521   1,352,388    
Reduction in carrying value of receivable related to vessel [1] 480 480            
Carrying value of receivable after fair value adjustment               $ 116,496
Decrease in Noncontrolling interests [2] $ 13,266 $ 13,266            
Series A Warrants                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares 2,400,000 2,400,000            
Warrants exercise price | $ / shares $ 57.06 $ 57.06            
Series B Warrants                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares 2,600,000 2,600,000            
Warrants exercise price | $ / shares $ 62.28 $ 62.28            
Reorganization Adjustments                
Fresh Start Accounting [Line Items]                
Shares issued | shares     18.5          
Additional paid-in capital               756,346
Fair Value of Successor additional paid-in capital               1,055,391
Reorganization Adjustments | Series A Warrants                
Fresh Start Accounting [Line Items]                
Series A Warrants (2,432,432 Warrants at $1.88 per warrant)               5,510
Reorganization Adjustments | Series B Warrants                
Fresh Start Accounting [Line Items]                
Series A Warrants (2,432,432 Warrants at $1.88 per warrant)               4,945
Reorganization Adjustments | Issued Creditor Warrants                
Fresh Start Accounting [Line Items]                
Series A Warrants (2,432,432 Warrants at $1.88 per warrant)               192,108
Reorganization Adjustments | Reserved Creditor Warrants                
Fresh Start Accounting [Line Items]                
Series A Warrants (2,432,432 Warrants at $1.88 per warrant)               $ 96,482
Reorganization Adjustments | Predecessor Stock Holder                
Fresh Start Accounting [Line Items]                
Shares issued | shares     1.5          
Reorganization Adjustments | Common Stock                
Fresh Start Accounting [Line Items]                
Per share value | $ / shares 25.00 25.00            
Reorganization Adjustments | New Creditor Warrant                
Fresh Start Accounting [Line Items]                
Warrants exercise price | $ / shares $ 25.00 $ 25.00            
Reorganization Adjustments | Series A Warrants                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares 2.4 2.4 2,432,432          
Warrants exercise price | $ / shares $ 57.06 $ 57.06 $ 1.88         $ 2.27
Reorganization Adjustments | Series B Warrents                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares 2.6 2.6 2,629,657          
Warrants exercise price | $ / shares $ 62.28 $ 62.28 $ 2.27         $ 1.88
Reorganization Adjustments | Issued Creditor Warrants                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares     7,684,453          
Warrants exercise price | $ / shares     $ 25          
Reorganization Adjustments | Reserved Creditor Warrants                
Fresh Start Accounting [Line Items]                
Number of shares of Tidewater Series warrants held by 401(k) plan | shares     3,859,361          
Warrants exercise price | $ / shares     $ 25          
Fresh Start Accounting Adjustments                
Fresh Start Accounting [Line Items]                
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            
Deferred income taxes 1,300 1,300            
Write-off of unamortized debt issuance costs 900              
Decrease in Noncontrolling interests 13,300 13,300            
Fresh Start Accounting Adjustments | Asset under Construction                
Fresh Start Accounting [Line Items]                
Fresh-start accounting deferred tax 800 800            
Fresh Start Accounting Adjustments | Asset under Construction | U.S. Pension Plan                
Fresh Start Accounting [Line Items]                
Reduction in carrying value of vessel 41,700 41,700            
Fresh Start Accounting Adjustments | Asset under Construction | 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            
Fresh Start Accounting Adjustments | Measurement Input, Discount Rate                
Fresh Start Accounting [Line Items]                
Fair value discount rate 12 12            
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 | shares     17.0          
General Unsecured Creditors | Reorganization Adjustments | New Creditor Warrant                
Fresh Start Accounting [Line Items]                
Shares issued | shares 7.7              
Unresolved Sale Leaseback Claim | Reorganization Adjustments | New Creditor Warrant                
Fresh Start Accounting [Line Items]                
Shares issued | shares     3.9          
8.00% New Secured Notes Due August 2022                
Fresh Start Accounting [Line Items]                
Aggregate principal amount $ 350,000 350,000   350,000 $ 100   $ 40  
New secured notes       $ 224,793   $ 349,954    
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            
Postconfirmation cash upon full payment 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            
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 Two Thousand Thirteen Senior Unsecured Notes                
Fresh Start Accounting [Line Items]                
Aggregate debt outstanding (500,000) (500,000)            
Restatement Adjustment | August Two Thousand Eleven Senior Unsecured Notes                
Fresh Start Accounting [Line Items]                
Aggregate debt outstanding (165,000) (165,000)            
Restatement Adjustment | September Twenty Ten 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            
[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.