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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 330715 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | TO SUPPORT THE BALTIMORE SYMPHONY ORCHESTRA IN ACCOMPLISHING ITS MISSIONS. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 32367 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 32367 |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BALTIMORE |
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| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 173990 |
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| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 0 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
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| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 6119 |
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| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 1 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 120000 |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | PHILADELPHIA |
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| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | COMMUNITY COUNSELING SERVICE CO LLC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | COUNSELING |
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| IRS990/CYContributionsGrantsAmt | 0 | 8741890 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 3085144 |
| IRS990/CYInvestmentIncomeAmt | 0 | 4160130 |
| IRS990/CYOtherExpensesAmt | 0 | 1943844 |
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| IRS990/CYTotalRevenueAmt | 0 | 12902020 |
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| IRS990/Desc | 0 | THE BALTIMORE SYMPHONY ENDOWMENT TRUST IS A SUPPORTING ORGANIZATION OF THE BALTIMORE SYMPHONY ORCHESTRA, INC. (BSO) AND EXISTS TO SUPPORT BSO IN ACCOMPLISHING ITS MISSIONS. THE DEPRECIATION EXPENSE OF THE ENDOWMENT TRUST RELATES TO ASSETS USED BY THE BSO IN FURTHERANCE OF ITS MISSION. |
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| IRS990/EmployeeCnt | 0 | 3 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
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| IRS990/ExpenseAmt | 0 | 4333165 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
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| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 31134 |
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| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 188419 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 194754 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 34.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 35.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 3482 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | MS TERRY MEYERHOFF RUBENSTEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | THE HONORABLE STEVEN R SCHUH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | MR CHRIS BARLETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MS BARBARA BOZZUTO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | MR KENNETH W DEFONTES JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | MR PAUL G MEECHAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | MR CALMAN J ZAMOISKI JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | MS KATHARINE CALDWELL |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 276514 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR OF PHILANTHROPIC SERVICES |
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| IRS990/FormationYr | 0 | 2006 |
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| IRS990/FSAuditedInd | 0 | 1 |
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| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
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| IRS990/GrossReceiptsAmt | 0 | 36899978 |
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| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE ORGANIZATION IS A SUPPORTING ORGANIZATION OF THE BALTIMORE SYMPHONY ORCHESTRA, INC. (BSO) AND EXISTS TO SUPPORT BSO IN ACCOMPLISHING ITS MISSIONS. THE DEPRECIATION EXPENSE OF THE ENDOWMENT TRUST RELATES TO ASSETS USED BY THE BSO IN FURTHERANCE OF ITS MISSION. |
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| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 250 |
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| IRS990/PrincipalOfficerNm | 0 | PAUL MEECHAM |
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| IRS990/PYTotalExpensesAmt | 0 | 6000610 |
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| IRS990/QuidProQuoContributionsInd | 0 | 0 |
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| IRS990/RelatedOrganizationCtrlEntInd | 0 | 1 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 1 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
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| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/PowerAppointMajorityDirTrstInd | 0 | 1 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | THE BALTIMORE SYMPHONY ENDOWMENT TRUST ALSO SUPPORTS THE BALTIMORE SYMPHONY ORCHESTRA BY HOLDING AND MAINTAINING THE BUILDING. MAINTENANCE AND DEPRECIATION EXPENSE ASSOCIATED WITH THE BUILDING HAVE BEEN RECORDED ON THE BALTIMORE SYMPHONY ENDOWMENT TRUSTS BOOKS AND RECORDS. |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | SCHEDULE A, PART I, QUESTION 11G, LINE VI: |
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| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 2620731 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 36453 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 371884 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 15906986 |
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| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 1625695 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1181804 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 1015999 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 573404 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 6241313 |
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| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.35720 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 7925792 |
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| IRS990ScheduleA/SupportedOrganizationsTotalCnt | 0 | 1 |
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| IRS990ScheduleA/SupportedOrgInformationGrp/GoverningDocumentListedInd | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OrganizationTypeCd | 0 | 7 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OtherSupportAmt | 0 | 188419 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportAmt | 0 | 3085144 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine1Txt | 0 | BALTIMORE SYMPHONY ORCHESTRA INC |
| IRS990ScheduleA/SupportingOrganization509a3Ind | 0 | X |
| IRS990ScheduleA/SupportingOrgType1Ind | 0 | X |
| IRS990ScheduleA/SupportSumAmt | 0 | 3085144 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 8741890 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 4136028 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 2620731 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 36453 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 371884 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 15906986 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 22190509 |
| IRS990ScheduleA/UnrelatedBusinessNetIncm170Grp/CurrentTaxYearAmt | 0 | 42210 |
| IRS990ScheduleA/UnrelatedBusinessNetIncm170Grp/TotalAmt | 0 | 42210 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 21539708 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 18496366 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 40036074 |
| IRS990ScheduleD/CYEndwmtFundGrp/AdministrativeExpensesAmt | 0 | 92739 |
| IRS990ScheduleD/CYEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 67715170 |
| IRS990ScheduleD/CYEndwmtFundGrp/ContributionsAmt | 0 | 7754734 |
| IRS990ScheduleD/CYEndwmtFundGrp/EndYearBalanceAmt | 0 | 68326953 |
| IRS990ScheduleD/CYEndwmtFundGrp/GrantsOrScholarshipsAmt | 0 | 3085144 |
| IRS990ScheduleD/CYEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | -1870165 |
| IRS990ScheduleD/CYEndwmtFundGrp/OtherExpendituresAmt | 0 | 2094903 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | 76813 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 62317116 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/ContributionsAmt | 0 | 1136019 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 67715170 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/GrantsOrScholarshipsAmt | 0 | 3000697 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 8840604 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 1501059 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | 107868 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 58977049 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/ContributionsAmt | 0 | 493000 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 62317116 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/GrantsOrScholarshipsAmt | 0 | 3061013 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 7395217 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 1379269 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | 112762 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 58573366 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/ContributionsAmt | 0 | 191772 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 58977049 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/GrantsOrScholarshipsAmt | 0 | 2864511 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 4783470 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 1594286 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | 99203 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 54379133 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 58573366 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/GrantsOrScholarshipsAmt | 0 | 2872540 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 7552110 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 386134 |
| IRS990ScheduleD/EndowmentsHeldRelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/EndowmentsHeldUnrelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 203120 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 3641420 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 3844540 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 658350 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 658350 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 1498971 |