| Document and Entity Information | Nov. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 3, 2021 |
| Entity Registrant Name | OneSpaWorld Holdings Limited |
| Entity Incorporation, State or Country Code | C5 |
| Entity File Number | 001-38843 |
| Entity Tax Identification Number | 00-0000000 |
| Contact Personnel Name | Harry B. Sands, Lobosky Management Co. Ltd. |
| Entity Address, Address Line One | Office Number 2 |
| Entity Address, Address Line Two | Pineapple Business Park |
| Entity Address, Address Line Three | Airport Industrial Park |
| Entity Address, Postal Zip Code | P.O. Box N-624 |
| Entity Address, City or Town | Nassau |
| Entity Address, Region | Island of New Providence |
| 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 |
| Title of 12(b) Security | Common Shares, par value (U.S.) $0.0001 per share |
| Trading Symbol | OSW |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001758488 |
