| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 2951363 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 8529115 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | SEE SCHEDULE O |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | MARY BETH MOLLOY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6174144030 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | ONE BOSTON MEDICAL CENTER PLACE |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02118 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 0 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 69364 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 69364 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 1 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 4833854 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 120897 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 5995 WINDWARD PARKWAY |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | PO BOX 842175 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | ALPHARETTA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | DALLAS |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | GA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | TX |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 30005 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 752842175 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | CHANGE HEALTHCARE LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | VIZIENT INC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | BILLING SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | HEALTHCARE PERFORMANCE CONSULTING |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 0 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 767647 |
| IRS990/CYOtherExpensesAmt | 0 | 7545659 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 20385910 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -8598293 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 22206191 |
| IRS990/CYTotalExpensesAmt | 0 | 29751850 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 21153557 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 1 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 777 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 2247 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 3024 |
| IRS990/Desc | 0 | SEE SCHEDULE O |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonatedServicesAndUseFcltsAmt | 0 | 12789279 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 22599559 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 1 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 2504897 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 2504897 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignCountryCd | 0 | CJ |
| IRS990/ForeignFinancialAccountInd | 0 | 1 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 22.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 56.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 16 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 17 | 55.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 18 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 19 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 21 | 55.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 32.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.00 |
| 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 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 3 | X |
| 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/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 | 33452 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 68523 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 41056 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 38767 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 32363 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 63161 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 62356 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 78573 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 71705 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 125576 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 72807 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 56663 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 41856 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 44175 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 2496 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 76044 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 61765 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 59645 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 56003 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | ALASTAIR BELL MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | WILLIAM CREEVY MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | JENNIFER TSENG MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | KAREN ANTMAN MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ANTHONY HOLLENBERG MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | GREGORY GRILLONE MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | ROBERT VINCI MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | CHRISTIAN ARBELAEZ MD MPH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ALIK FARBER MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SUSHRUT WAIKAR MD MPH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JACOB PIETER NOORDZIJ MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | ANITA CARSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | MANJU SUBRAMANIAN MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | MANISHI DESAI MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | THAMARAH CREVECOEUR CNM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | MEGHAN DIERKS MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | MONICA NOETHER PHD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | RICHARD SUGARMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | DAVID COLEMAN MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | STEPHEN CHRISTIANSEN MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | AVIVA LEE-PARRITZ MD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | DAVID BECK |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 1769199 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 1161864 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 1156227 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 1057855 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 931987 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 861413 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 712756 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 604972 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 584896 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 428640 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 457320 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 384475 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 341182 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 291570 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 67560 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 369426 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 1652000 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 799580 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 705489 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 681033 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | TRUSTEE (UNTIL 6/1/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TRUSTEE/PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TRUSTEE/TREASURER (UNTIL 1/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TREASURER (2/24-6/24), TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TREASURER (AS OF 6/24), TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE (UNTIL 8/23) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE (AS OF 1/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE (AS OF 6/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | TRUSTEE/CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | FORMER TRUSTEE/CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | FORMER TRUSTEE/TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | FORMER TRUSTEE/CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | FORMER ASSISTANT CLERK |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1994 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 1 |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 14 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 21153557 |
| IRS990/GroupExemptionNum | 0 | 8094 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 2 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartVInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 767647 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 767647 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 6364668 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 7013678 |
| IRS990/IRPDocumentCnt | 0 | 293 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 10584 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 13607 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 10583 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 21167 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 1 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | SEE SCHEDULE O |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 10437961 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 11508088 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 305519 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 10437961 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 11508088 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 271886 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 271886 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 6124 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 17712 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 23836 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 66655976 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 64160873 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | -3426378 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 1002189 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 2898418 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 3900607 |
| IRS990/OtherExpensesGrp/Desc | 0 | CORPORATE ALLOCATIONS |
| IRS990/OtherExpensesGrp/Desc | 1 | MEDICAL & SURGICAL SUPP |
| IRS990/OtherExpensesGrp/Desc | 2 | DUES & LICENCES |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 1160653 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 7043 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 3356708 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 52028 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 20369 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 4517361 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 52028 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 27412 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 93605850 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 85549167 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 4703283 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 13602301 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 18305584 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PaymentsToAffiliatesGrp/ProgramServicesAmt | 0 | 74544 |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 74544 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PoliciesReferenceChaptersInd | 0 | 1 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | WILLIAM R CREEVY MD |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | INSTITUTIONAL SUPPORT |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 20385910 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 20385910 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 0 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 242583 |
| IRS990/PYOtherExpensesAmt | 0 | 8027922 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 15821865 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -13615341 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 21651867 |
| IRS990/PYTotalExpensesAmt | 0 | 29679789 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 16064448 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -8598293 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 1 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 1 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 20385910 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 33960923 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 34401236 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/Contribution35ControlledInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionControllerInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionFamilyInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ControlledDisqualifiedPrsnInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnControllIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnOwnrIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ExcessBusinessHoldingsRulesInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ListedByNameGoverningDocInd | 0 | 1 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/LoanDisqualifiedPersonInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/OrganizationChangeSuprtOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/PaymentSubstantialContribtrInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgNotOrganizedUSInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgSectionC456Ind | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportNonSupportedOrgInd | 0 | 0 |