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| IRS990/ActivityOrMissionDesc | 0 | THE NHP FOUNDATION IS A NONPROFIT DEDICATED TO MAKING INVESTMENTS TO PRESERVE & CREATE AFFORDABLE MULTIFAMILY HOUSING FOR LOW-TO-MODERATE INCOME FAMILIES & SENIORS. |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 26 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 27 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 28 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIRMAN OF THE BOARD |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | CEO & BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CFO & TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | COO & CIO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | SENIOR VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | CAO |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1989 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 10313 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 8 |
| IRS990/GrantAmt | 0 | 316814 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 316814 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 316814 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 10313 |
| IRS990/GrossReceiptsAmt | 0 | 21427453 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 7 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 28 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 307164 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 307164 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 3755314 |
| IRS990/InterestGrp/TotalAmt | 0 | 3755314 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 1094433 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 1094433 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 43495037 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 48149579 |
| IRS990/IRPDocumentCnt | 0 | 86 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 4264231 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 64625297 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 76303749 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 80567980 |
| IRS990/LegalDomicileStateCd | 0 | DC |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 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 NHP FOUNDATION IS A NONPROFIT ORGANIZATION DEDCICATED TO MAKING INVESTMENTS THAT PRESERVE AND CREATE AFFORDABLE MULTIFAMILY HOUSING FOR LOW-TO MODERATE-INCOME FAMILIES AND SENIORS. THE FOUNDATION ALSO PROVIDES A COMPREHENSIVE ARRAY OF PROGRAMS AND SERVICES TO ENHANCE THE QUALITY OF LIFE FOR ITS RESIDENTS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 45613082 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 63033674 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 92232154 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 87907337 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 10313 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 10313 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |