| Document and Entity Information | Sep. 20, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 20, 2024 |
| Entity Registrant Name | OneSpaWorld Holdings Limited |
| Entity Incorporation State Country Code | C5 |
| Entity File Number | 001-38843 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address Address Line 1 | Office Number 2 |
| Entity Address Address Line 2 | Pineapple Business Park |
| Entity Address Address Line 3 | Airport Industrial Park |
| Entity Address Postal Zip Code | P.O. Box N-624 |
| Entity Address City Or Town | Nassau |
| Entity Address Country | BS |
| City Area Code | 242 |
| Local Phone Number | 322-2670 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Shares, par value (U.S.) |
| Trading Symbol | OSW |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001758488 |
| Amendment Flag | false |
