CONSOLIDATED AND COMBINED STATEMENTS OF EQUITY (DEFICIT) - USD ($) $ in Thousands		Total	2020 Private Placement [Member]	At-the- Market Equity Offering [Member]	Net Parent Investment [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] 2020 Private Placement [Member]	Additional Paid-in Capital [Member] At-the- Market Equity Offering [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total Parent's/OneSpaWorld Stockholders' Equity (Deficit) [Member]	Total Parent's/OneSpaWorld Stockholders' Equity (Deficit) [Member] 2020 Private Placement [Member]	Total Parent's/OneSpaWorld Stockholders' Equity (Deficit) [Member] At-the- Market Equity Offering [Member]	Non-Controlling Interest [Member]	Voting Common Stock [Member]	Voting Common Stock [Member] 2020 Private Placement [Member]	Voting Common Stock [Member] At-the- Market Equity Offering [Member]	Non-Voting Common Stock [Member]	Non-Voting Common Stock [Member] 2020 Private Placement [Member]	Voting and Non-Voting Common Stock [Member]	Voting and Non-Voting Common Stock [Member] 2020 Private Placement [Member]
BALANCE at Dec. 31, 2017		$ 225,281			$ 221,041				$ (356)		$ 220,685			$ 4,596
Net (loss) income		13,743			9,886						9,886			3,857
Distributions to noncontrolling interest		(4,867)												(4,867)
Net distributions to Parent and its affiliates		(361,447)			(361,447)						(361,447)
Foreign currency translation adjustment gain (loss)		(293)							(293)		(293)
BALANCE at Dec. 31, 2018		(127,583)			(130,520)				(649)		(131,169)			3,586
Net (loss) income		(24,781)			(25,459)						(25,459)			678
Distributions to noncontrolling interest		(267)												(267)
Net contributions from Parent and its affiliates		351,802			351,802						351,802
Foreign currency translation adjustment gain (loss)		(165)							(165)		(165)
BALANCE at Mar. 19, 2019		199,006			195,823				(814)		195,009			3,997
Net (loss) income		(30,279)
BALANCE at Mar. 31, 2019		594,100
BALANCE at Mar. 19, 2019		199,006			195,823				(814)		195,009			3,997
Net (loss) income		(29,320)
BALANCE at Jun. 30, 2019		594,929
BALANCE at Mar. 19, 2019		199,006			195,823				(814)		195,009			3,997
Net (loss) income		(25,050)
BALANCE at Sep. 30, 2019		599,384
BALANCE at Mar. 19, 2019		199,006			$ 195,823				(814)		195,009			3,997
Net (loss) income		(31,935)
BALANCE at Dec. 31, 2019		590,468				$ 616,888			719	$ (35,269)	582,344			8,124						$ 6
BALANCE (In Shares) at Dec. 31, 2019															61,119
BALANCE at Mar. 20, 2019	[1]	633,590				627,960					627,966			5,624						6
BALANCE (In Shares) at Mar. 20, 2019	[1]														61,118
Immaterial correction of an error		(29,321)				(29,321)					(29,321)
Net (loss) income		(31,935)								(35,269)	(35,269)			3,334
Conversion of public warrants into common shares		11				11					11
Conversion of public warrants into common shares (In Shares)															1
Dividends declared		(2,445)				(2,445)					(2,445)
Distributions to noncontrolling interest		(834)												(834)
Stock-based compensation		20,683				20,683					20,683
Foreign currency translation adjustment gain (loss)		(183)							(183)		(183)
Unrealized / Unrecognized gain (loss) on derivatives		902							902		902
BALANCE at Dec. 31, 2019		590,468				616,888			719	(35,269)	582,344			8,124						6
BALANCE (In Shares) at Dec. 31, 2019															61,119
BALANCE at Mar. 31, 2019		594,100
Net (loss) income		959
BALANCE at Jun. 30, 2019		594,929
Net (loss) income		4,270
BALANCE at Sep. 30, 2019		599,384
Net (loss) income		(6,885)
BALANCE at Dec. 31, 2019		590,468				616,888			719	(35,269)	582,344			8,124						6
BALANCE (In Shares) at Dec. 31, 2019															61,119
Net (loss) income		(148,362)
BALANCE at Mar. 31, 2020		417,897
BALANCE at Dec. 31, 2019		590,468				616,888			719	(35,269)	582,344			8,124						6
BALANCE (In Shares) at Dec. 31, 2019															61,119
Net (loss) income		(169,055)
BALANCE at Jun. 30, 2020		424,414
BALANCE at Dec. 31, 2019		590,468				616,888			719	(35,269)	582,344			8,124						6
BALANCE (In Shares) at Dec. 31, 2019															61,119
Net (loss) income		(216,602)
BALANCE at Sep. 30, 2020		378,459
BALANCE at Dec. 31, 2019		590,468				616,888			719	(35,269)	582,344			8,124						6
BALANCE (In Shares) at Dec. 31, 2019															61,119
Net (loss) income		(287,977)								(287,977)	(287,977)
Dividends declared		(2,449)				(2,449)					(2,449)
Net of issuance costs			$ 53,407	$ 10,823			$ 53,404	$ 10,823				$ 53,407	$ 10,823								$ 3
Net of issuance costs, Shares																6,564	1,259		17,186
Reclassification of public warrants to liabilities		(26,500)				(26,500)					(26,500)
Distributions to noncontrolling interest		(4,011)												(4,011)
Stock-based compensation		4,950				4,950					4,950
Foreign currency translation adjustment gain (loss)		(377)							(377)		(377)
Common shares issued under equity incentive plan, Shares															251
Unrealized / Unrecognized gain (loss) on derivatives		(5,817)							(5,817)		(5,817)
Purchase of noncontrolling interest		(10,810)				(6,697)					(6,697)			$ (4,113)
Purchase of noncontrolling interest, Shares															99
Purchase of public warrants		(879)				(879)					(879)
BALANCE at Dec. 31, 2020		320,828				649,540			(5,475)	(323,246)	320,828									9
BALANCE (In Shares) at Dec. 31, 2020															69,292			17,186
BALANCE at Mar. 31, 2020		417,897
Net (loss) income		(20,693)
BALANCE at Jun. 30, 2020		424,414
Net (loss) income		(47,547)
BALANCE at Sep. 30, 2020		378,459
Net (loss) income		(71,375)
BALANCE at Dec. 31, 2020		$ 320,828				$ 649,540			$ (5,475)	$ (323,246)	$ 320,828									$ 9
BALANCE (In Shares) at Dec. 31, 2020															69,292			17,186

[1] Initial equity balances of the Successor reflect the equity of the accounting acquirer, Haymaker Acquisition Corp., and the issuance of common stock, warrants and cash contributed by Haymaker in connection with the acquisition of OSW Predecessor.