Document and Entity Information	9 Months Ended
	Sep. 30, 2020 shares
Document and Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	ONESPAWORLD HOLDINGS Ltd
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	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
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 Park Airport Industrial Park
Entity Address, Address Line Three	P.O. Box N-624
Entity Address, City or Town	Nassau
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
Voting Common Stock [Member]
Document and Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	67,782,651
Non-Voting Common Stock [Member]
Document and Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	17,185,500