<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>289</ContextCount>
  <ElementCount>242</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>74</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossIncome</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Disclosure - ORGANIZATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureORGANIZATION</Role>
      <ShortName>ORGANIZATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureGOODWILLANDINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBT</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - WARRANT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureWarrantLiabilities</Role>
      <ShortName>WARRANT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - REVENUE RECOGNITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureREVENUERECOGNITION</Role>
      <ShortName>REVENUE RECOGNITION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - SEGMENT AND GEOGRAPHICAL INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSEGMENTANDGEOGRAPHICALINFORMATION</Role>
      <ShortName>SEGMENT AND GEOGRAPHICAL INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveLossIncome</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVES</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureINCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureCOMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100190 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100200 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100210 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100220 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureGOODWILLANDINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureGOODWILLANDINTANGIBLEASSETS</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100230 - Disclosure - LONG-TERM DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBTTables</Role>
      <ShortName>LONG-TERM DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBT</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100240 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATION</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100250 - Disclosure - REVENUE RECOGNITION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureREVENUERECOGNITIONTables</Role>
      <ShortName>REVENUE RECOGNITION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureREVENUERECOGNITION</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100260 - Disclosure - SEGMENT AND GEOGRAPHICAL INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSEGMENTANDGEOGRAPHICALINFORMATIONTables</Role>
      <ShortName>SEGMENT AND GEOGRAPHICAL INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSEGMENTANDGEOGRAPHICALINFORMATION</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100270 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveLossIncomeTables</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveLossIncome</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100280 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVES</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100290 - Disclosure - ORGANIZATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureORGANIZATIONAdditionalInformationDetails</Role>
      <ShortName>ORGANIZATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100300 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Reconciles Cash, Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSummaryOfReconcilesCashCashEquivalentsAndRestrictedCashDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Reconciles Cash, Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100310 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Income (Loss) per Basic and Diluted Share Calculation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfIncomeLossPerBasicAndDilutedShareCalculationDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Income (Loss) per Basic and Diluted Share Calculation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100320 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Number of Antidilutive Potential Common Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfNumberOfAntidilutivePotentialCommonSharesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Number of Antidilutive Potential Common Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100330 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureGOODWILLANDINTANGIBLEASSETSAdditionalInformationDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100340 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Summary of Cost, Accumulated Amortization, and Net Balance of the Definite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureGOODWILLANDINTANGIBLEASSETSSummaryOfCostAccumulatedAmortizationAndNetBalanceOfDefiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Summary of Cost, Accumulated Amortization, and Net Balance of the Definite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100350 - Disclosure - LONG-TERM DEBT - Summary of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBTSummaryOfLongTermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Summary of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100360 - Disclosure - LONG-TERM DEBT - Schedule of Principal Repayments on Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBTScheduleOfPrincipalRepaymentsOnLongTermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Schedule of Principal Repayments on Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100370 - Disclosure - LONG-TERM DEBT - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBTAdditionalInformationDetails</Role>
      <ShortName>LONG-TERM DEBT - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100380 - Disclosure - LONG-TERM DEBT - Schedule of Borrowing Capacity and Amount Borrowed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureLONGTERMDEBTScheduleOfBorrowingCapacityAndAmountBorrowedDetails</Role>
      <ShortName>LONG-TERM DEBT - Schedule of Borrowing Capacity and Amount Borrowed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100400 - Disclosure - WARRANT LIABILITIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureWarrantLiabilitiesAdditionalInformationDetails</Role>
      <ShortName>WARRANT LIABILITIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100410 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATIONAdditionalInformationDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100420 - Disclosure - STOCK-BASED COMPENSATION - Summary of Restricted Share Units Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATIONSummaryOfRestrictedShareUnitsActivityDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of Restricted Share Units Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100430 - Disclosure - STOCK-BASED COMPENSATION - Summary of PSUs Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSTOCKBASEDCOMPENSATIONSummaryOfPsusActivityDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of PSUs Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100440 - Disclosure - REVENUE RECOGNITION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureREVENUERECOGNITIONAdditionalInformationDetails</Role>
      <ShortName>REVENUE RECOGNITION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100450 - Disclosure - REVENUE RECOGNITION - Summary of Disaggregation of Revenue By Revenue Source and Operating Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureREVENUERECOGNITIONSummaryOfDisaggregationOfRevenueByRevenueSourceAndOperatingSegmentDetails</Role>
      <ShortName>REVENUE RECOGNITION - Summary of Disaggregation of Revenue By Revenue Source and Operating Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100460 - Disclosure - SEGMENT AND GEOGRAPHICAL INFORMATION - Summary of Geographic Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSEGMENTANDGEOGRAPHICALINFORMATIONSummaryOfGeographicInformationDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHICAL INFORMATION - Summary of Geographic Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100470 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of Changes in Accumulated Other Comprehensive (Loss) Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveLossIncomeSummaryOfChangesInAccumulatedOtherComprehensiveLossIncomeDetails</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of Changes in Accumulated Other Comprehensive (Loss) Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://onespaworld.com/20220630/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveLossIncomeTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100480 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Carrying Amounts and Estimated Fair Values of the Company's Cash, Restricted Cash, and Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/DisclosureFairValueMeasurementsAndDerivativesSummaryOfCarryingAmountsAndEstimatedFairValuesOfTheCompanysCashRestrictedCashAndLongtermDeb</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Carrying Amounts and Estimated Fair Values of the Company's Cash, Restricted Cash, and Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100490 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESSummaryOfFairValueOnRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100500 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Significant Assumptions used to Determine Fair Value of Public and 2020 PIPE Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESSignificantAssumptionsUsedToDetermineFairValueOfPublicAnd2020PIPEWarrantsDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Significant Assumptions used to Determine Fair Value of Public and 2020 PIPE Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100510 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Significant Assumptions used to Determine Fair Value of Sponsor Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESSignificantAssumptionsUsedToDetermineFairValueOfSponsorWarrantsDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Significant Assumptions used to Determine Fair Value of Sponsor Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100520 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESAdditionalInformationDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100530 - Disclosure - FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Interest Rate Swap Contract (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureFAIRVALUEMEASUREMENTSANDDERIVATIVESSummaryOfInterestRateSwapContractDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS AND DERIVATIVES - Summary of Interest Rate Swap Contract (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100540 - Disclosure - INCOME TAXES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureINCOMETAXESAdditionalInformationDetails</Role>
      <ShortName>INCOME TAXES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100550 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureCOMMITMENTSANDCONTINGENCIESAdditionalInformationDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="osw-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100560 - Disclosure - SUBSEQUENT EVENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onespaworld.com/20220630/taxonomy/role/Role_DisclosureSUBSEQUENTEVENTSAdditionalInformationDetails</Role>
      <ShortName>SUBSEQUENT EVENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="osw-20220630.htm">osw-20220630.htm</File>
    <File>osw-20220630.xsd</File>
    <File>osw-20220630_cal.xml</File>
    <File>osw-20220630_def.xml</File>
    <File>osw-20220630_lab.xml</File>
    <File>osw-20220630_pre.xml</File>
    <File>osw-ex31_1.htm</File>
    <File>osw-ex31_2.htm</File>
    <File>osw-ex32_1.htm</File>
    <File>osw-ex32_2.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="741">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
