| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 509178 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 800715 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 1543730 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2507201 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | OUR MISSION IS TO RESEARCH, BUILD, AND ADVOCATE FOR ARCHITECTURE THAT PROMOTES JUSTICE AND HUMAN DIGNITY. |
| IRS990/AddressChangeInd | 0 | X |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 90345 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 90345 |
| IRS990/AllOtherContributionsAmt | 0 | 3362391 |
| IRS990/AmendedReturnInd | 0 | X |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | ALAN A RICKS |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8572335788 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 1 CHANDLER STREET FLOOR 1 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02116 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 7208133 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 4524047 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 339762 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 339762 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 8178209 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 152808 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 161650 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 124342 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 4 | 124100 |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/AddressLine1Txt | 0 | PO BOX 3499 BODIFA HOUSE |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/AddressLine1Txt | 1 | CENTRAL SQUARE 4TH STREET |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/AddressLine1Txt | 2 | 166 FLEMING ROAD |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CityNm | 0 | NEWCASTLE UPON TYNE |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CountryCd | 0 | RW |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CountryCd | 1 | UK |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/CountryCd | 2 | UK |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/ForeignPostalCd | 0 | NE1 3PL |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/ForeignPostalCd | 1 | E17 SEU |
| IRS990/ContractorCompensationGrp/ContractorAddress/ForeignAddress/ProvinceOrStateNm | 0 | 0 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 6900 N CENTRAL PARK AVE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | PO BOX 4516 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | LINCOLNWOOD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | PORTSMOUTH |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | NH |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 60712 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 03802 |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 0 | REMOTE PARTNERS |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 1 | OVE ARUP PARTNERS INTERNATIONAL |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 2 | RAVENSWOOD STUDIO INC |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 3 | ALVAREZ DORAN DESIGN PLANNING LT |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 4 | PETERSON ENGINEERING INC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | CONSTRUCTION MGMT |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | ENGINEERING |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | FABRICATION SVCS |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | ARCHITECTURAL DESIGN |
| IRS990/ContractorCompensationGrp/ServicesDesc | 4 | ENGINEERING |
| IRS990/CostOfGoodsSoldAmt | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 3362391 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 0 |
| IRS990/CYOtherExpensesAmt | 0 | 14819665 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 22767987 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 3248042 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 8062671 |
| IRS990/CYTotalExpensesAmt | 0 | 22882336 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 865550 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 26130378 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 7386843 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 1192535 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 295904 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 295904 |
| IRS990/Desc | 0 | HIGH IMPACT DESIGN: MASS DESIGN GROUP DESIGNS INNOVATIVE BUILDINGS THAT IMPROVE PEOPLE'S LIVES IN MEASURABLE WAYS. WE CREATE ENVIRONMENTS THAT PROMOTE HEALTH AND DIGNITY. THROUGHOUT THE CONSTRUCTION PROCESS, WE COLLABORATE WITH THE COMMUNITIES OUR BUILDINGS WILL SERVE, APPROACHING EVERY PROJECT AS A CHANCE TO INVEST IN THEIR FUTURE. OUR PORTFOLIO OF DESIGN SERVICES INCLUDE ARCHITECTURAL DESIGN, MASTER PLANNING, LANDSCAPE ARCHITECTURE, AND STRATEGIC PLANNING. MAJOR DESIGN INITIATIVES IN FY18 INCLUDED THE MEMORIAL TO PEACE AND JUSTICE, UNIVERSITY OF GLOBAL HEALTH EQUITY HOUSING & LANDSCAPE DESIGN. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | true |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 115336 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 174405 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 76 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountLiabilityGrp/BOYAmt | 0 | 0 |
| IRS990/EscrowAccountLiabilityGrp/EOYAmt | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 17413985 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 393874 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 393874 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignActivitiesInd | 0 | true |
| IRS990/ForeignCountryCd | 0 | RW |
| IRS990/ForeignFinancialAccountInd | 0 | true |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | true |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 16 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 17 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 18 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 19 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | 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/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/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 4832 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 4832 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 3469 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 4200 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 3423 |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | MICHAEL P MURPHY JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ALAN A RICKS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Peter Torrebiarte |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Sierra Bainbridge |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Patricia Grutis |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Dave Saladik |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Justin Brown |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Matthew Smith |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | PARDIS SABETI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | DIANA RAMIREZ-JASSO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JODY ADAMS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | DON KIMELMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | MARC NORMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | KAREN CONWAY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | PAUL NAKAZAWA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | JAY WICKERSHAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | NEIL MAHAPATRA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | JEAN SHIA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | DAN PONTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | JANETTE SADIK-KHAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | Adrienne Ellman |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 170098 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 160000 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 142026 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 116595 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 110000 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 105701 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 98434 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 85723 |
| 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/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/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT/EXECUTIVE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TREAS./CHIEF OPERATING OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Director of Operations |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Managing Dir./Senior Principal |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Highest Compensated Employee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Highest Compensated Employee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Highest Compensated Employee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Corp. Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | CO-CHAIR/DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | CHAIR/DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Assistant Secretary |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 2010 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/FundraisingDirectExpensesAmt | 0 | 0 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 14 |
| IRS990/GrantAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 26130378 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 0 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 54360 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 54360 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/TotalAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 56 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 866794 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 713684 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 615259 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1482053 |
| IRS990/LegalDomicileStateCd | 0 | DC |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | MASS DESIGN GROUP SEEKS TO DESIGN, CONSTRUCT, AND ADVOCATE FOR BUILDINGS AND ENVIRONMENTS THAT IMPROVE LIVES IN UNDERSERVED AND IMPROVED REGIONS IN THE WORLD. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 362353 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1138073 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 4386115 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1022737 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 4211710 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 453273 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 453273 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 31516 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 31516 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 33304 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 33304 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 308573 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 306355 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 614928 |
| IRS990/OtherExpensesGrp/Desc | 0 | SUBCONTRACTOR COSTS |
| IRS990/OtherExpensesGrp/Desc | 1 | CONSTRUCTION MATERIALS |
| IRS990/OtherExpensesGrp/Desc | 2 | CONSTRUCTION |
| IRS990/OtherExpensesGrp/Desc | 3 | ALL OTHER EXPENSES |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 119052 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 787447 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 10923874 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 924323 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 252395 |