| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 26044 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 14563 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 6683 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | (SEE SCHEDULE O FOR ORGANIZATION MISSION STATEMENT)THE BROOKLINE COMMUNITY FOUNDATION SHINES A SPOTLIGHT ON COMMUNITY NEEDS, INSPIRES PHILANTHROPY AND AWARDS STRATEGIC GRANTS TO BUILD A MORE VIBRANT, ENGAGED AND EQUITABLE BROOKLINE. |
| IRS990/AllOtherContributionsAmt | 0 | 1181787 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | LAURA BECKER FINANCE DIRECTOR |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6175664442 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 40 WEBSTER PLACE |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BROOKLINE |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02445 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 519188 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 359986 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 37225 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 14890 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 96780 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 148895 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 2719 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 357 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 2565 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 5641 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContriRptFundraisingEventAmt | 0 | 77241 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 1259028 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 666230 |
| IRS990/CYInvestmentIncomeAmt | 0 | 276574 |
| IRS990/CYOtherExpensesAmt | 0 | 264323 |
| IRS990/CYOtherRevenueAmt | 0 | 68730 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 52512 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 621267 |
| IRS990/CYTotalExpensesAmt | 0 | 1551820 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 245693 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1604332 |
| IRS990/DAFExcessBusinessHoldingsInd | 0 | 0 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 136 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 4041 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 1670 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 587 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 17663 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 19920 |
| IRS990/Desc | 0 | GENERALLY, THE FOUNDATION STRIVES TO BUILD A BETTER BROOKLINE BY:- SHINING A SPOTLIGHT ON COMMUNITY NEEDS THROUGH LEADERSHIP ON RESEARCH AND CONVENINGS;- INSPIRING PHILANTHROPY THROUGHOUT THE TOWN INCLUDING WORKING WITH DONORS TO BUILD AND LEVERAGE ANNUAL AND PERMANENT CHARITABLE FUNDS; AND- AWARDING STRATEGIC GRANTS TO OUR NON-PROFIT PARTNERS TO MEET THE MOST PRESSING NEEDS IN TOWN. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DistributionToDonorInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 11 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1213259 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 11500 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 11500 |
| IRS990/FeesForServicesLegalGrp/FundraisingAmt | 0 | 855 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 25271 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 26126 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 30268 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 14053 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 25420 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 69741 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 10.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| 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/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 14703 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | JULIE MARCUS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | MICHAEL LINDSTROM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | GIOIA PERUGINI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | LAURA ALLEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JIM GRACE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | GERALD DAVIDSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | ALICIA HSU |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | VICTOR VIKTOROV |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | KIM BARNUM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | CHRIS CHANYASULKIT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JENNIFER DOPAZO GILBERT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | MELISSA LANGA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ANDREA GOODMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | LAUREN MISTRETTA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | LINDA OLSON PEHLKE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | ALAN MORSE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | JIM SLAYTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | HARRY BOHRS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | JENNY AMORY |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 131999 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | CLERK/CO-TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | CO-TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | CHIEF EXECUTIVE OFFICER |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1905 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 77241 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 38422 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 36420 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 12051 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 18 |
| IRS990/GrantAmt | 0 | 666230 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 237000 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 51000 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 666230 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 666230 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 210000 |
| IRS990/GrossReceiptsAmt | 0 | 1840703 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 70732 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 18 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 284 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 2667 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 4228 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 7179 |
| IRS990/InvestmentExpenseAmt | 0 | -33318 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 264523 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 264523 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 6676048 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 6047981 |
| IRS990/IRPDocumentCnt | 0 | 14 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 224840 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 229906 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 235686 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 460526 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 197949 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE BROOKLINE COMMUNITY FOUNDATION SHINES A SPOTLIGHT ON COMMUNITY NEEDS, INSPIRES PHILANTHROPY AND AWARDS STRATEGIC GRANTS TO BUILD A MORE VIBRANT, ENGAGED AND EQUITABLE BROOKLINE. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 7950247 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 7126430 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 12051 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 12051 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -2002 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -2002 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 70732 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 70732 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -828762 |
| IRS990/NoncashContributionsAmt | 0 | 33947 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1123 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 3333 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 25779 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 30235 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 30765 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 5341 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 29564 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 65670 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 119648 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 105399 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | -14249 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 20812 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 5166 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 32292 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 58270 |
| IRS990/OtherExpensesGrp/Desc | 0 | FISCAL SPONSOR EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 1 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/Desc | 2 | STAFF DEVELOPMENT |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 3919 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 709 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 2059 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 747 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 15341 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 2118 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 3418 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 15341 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 8096 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 4874 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 102141 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 28404 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 236149 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 366694 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 10222 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 3402 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 26072 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 39696 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 2981 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 362 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 4369 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 7712 |
| IRS990/PermanentlyRstrNetAssetsGrp/BOYAmt | 0 | 2041878 |
| IRS990/PermanentlyRstrNetAssetsGrp/EOYAmt | 0 | 2198490 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 531161 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 314288 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 8951 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 19337 |
| IRS990/PrincipalOfficerNm | 0 | JULIE MARCUS |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 1914472 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 516488 |
| IRS990/PYInvestmentIncomeAmt | 0 | 183963 |
| IRS990/PYOtherExpensesAmt | 0 | 269612 |
| IRS990/PYOtherRevenueAmt | 0 | 49544 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 845702 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 516177 |
| IRS990/PYTotalExpensesAmt | 0 | 1302277 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 2147979 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 52512 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 70732 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 121842 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 113357 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | MISCELLANEOUS INCOME - 2014 AMOUNT: $ 8,911. 2015 AMOUNT: $ 3,042. 2016 AMOUNT: $ 29. 2017 AMOUNT: $ 125. |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME: |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 1259028 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 1914472 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1153047 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 905336 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1236643 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 6468526 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 335255 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 302453 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 239809 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 260327 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 295128 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 1432972 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 413470 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 125 |