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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0000098222    
Entity Registrant Name TIDEWATER INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 1-6311    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 72-0487776    
Entity Address, Address Line One 842 West Sam Houston Parkway North, Suite 400    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77024    
City Area Code 713    
Local Phone Number 470-5300    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 468,100,000
Entity Common Stock, Shares Outstanding   41,322,217  
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Houston, Texas    
Auditor Firm ID 238    
ICFR Auditor Attestation Flag true    
Deloitte & Touche [Member]      
Document Information [Line Items]      
Auditor Name Deloitte & Touche    
Auditor Location Houston, Texas    
Auditor Firm ID 34    
Warrants to Purchase Shares of Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Warrants to purchase shares of common stock    
Trading Symbol TDW.WS    
Security Exchange Name NYSE    
Series B Warrants [Member]      
Document Information [Line Items]      
Title of 12(b) Security Series B Warrants to purchase shares of common stock    
Trading Symbol TDW.WS.B    
Security Exchange Name NYSE    
Series A Warrants [Member]      
Document Information [Line Items]      
Title of 12(b) Security Series A Warrants to purchase shares of common stock    
Trading Symbol TDW.WS.A    
Security Exchange Name NYSE    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol TDW    
Security Exchange Name NYSE