v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 28, 2026
Document and Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name OneSpaWorld Holdings Limited  
Entity Central Index Key 0001758488  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   101,498,712
Entity Incorporation, State or Country Code C5  
Entity Tax Identification Number 00-0000000  
Entity File Number 001-38843  
Entity Address, Address Line One Office Number 2  
Entity Address, Address Line Two Pineapple Business ParkAirport Industrial Park  
Entity Address, Address Line Three P.O. Box N-624  
Entity Address, City or Town Nassau, Island of New Providence  
Entity Address, Country BS  
Entity Address, Postal Zip Code 00000  
City Area Code 242  
Local Phone Number 322-2670  
Title of 12(b) Security Common Shares, par value (U.S.)$0.0001 per share  
Trading Symbol OSW  
Security Exchange Name NASDAQ