| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 169494 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 475212 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 5570 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 1571578 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | BOSTON HARBOR NOW, INC. (BHN) IS A NON-PROFIT ORGANIZATION WITH A BOLD MISSION: TO ENSURE A VIBRANT AND SUSTAINABLE FUTURE FOR BOSTON'S HARBOR, WATERFRONT, AND ISLANDS. BHN IS COMMITTED TO ACCESS, RESILIENCY, AND HARBOR'S ROLE IN THE HEALTH OF OUR REGION. BHN WORKS WITH PUBLIC AND PRIVATE PARTNERS TO INCREASE AWARENESS, ACCESS AND ENGAGEMENT WITH OUR HARBOR WHILE ENHANCING THE RESILIENCY OF OUR WATERFRONT. WE ARE THE LEGISLATED PARTNER OF THE BOSTON HARBOR ISLANDS NATIONAL AND STATE PARK AND THE CITY'S PARTNER OF THE HARBORWALK. |
| IRS990/AllOtherContributionsAmt | 0 | 2011144 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 14192 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 14192 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | CHARLES HOLLEY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6172238667 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 15 STATE STREET SUITE 1100 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02109 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 184893 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 57998 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 1 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 2108513 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 2746 |
| IRS990/CYOtherExpensesAmt | 0 | 1837901 |
| IRS990/CYOtherRevenueAmt | 0 | 787618 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 140679 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 11025 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1190630 |
| IRS990/CYTotalExpensesAmt | 0 | 3028531 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 3039556 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 240005 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 327417 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/Desc | 0 | BOSTON HARBOR NOW, INC. (BHN) MANAGES A NUMBER OF REVENUE-GENERATING SERVICES AND FACILITIES TO ENHANCE VISITOR EXPERIENCE AND PROVIDE FUNDING TO SUPPORT THE PARK. MANAGED SERVICES INCLUDE PUBLIC FERRY OPERATIONS, ISLAND-BASED FOOD SERVICE AND PRIVATE EVENTS, SPECTACLE ISLAND MARINA OPERATIONS, AND MAINLAND AND ISLAND-BASED GIFT STORES. IN ADDITION, BHN MANAGES THE MAINLAND PARK WELCOME CENTER LOCATED IN BOSTON ON BEHALF OF THE NATIONAL PARK SERVICE. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 0 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 18 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 3028531 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 527586 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 527586 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| 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 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 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/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | JEFFERY PORTER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | BARBARA CAPUANO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | CAROL CHURCHILL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | BRIAN DACEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MICHAEL DUKAIS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JAMIE FAY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | ROBERT GOLLEDGE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ELIZABETH GROB |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | JOHN HAMEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | MEAGHAN HOOPER-BERDIK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ANN KLEE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | ELIZABETH MORNINGSTAR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | J KEITH MOTLEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | MARTIN O'NEIL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | SHELLY O'NEIL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | BUD RIS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | PAIGE SCOTT-REED |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | CATHY DOUGLAS-STONE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | YANNI TSIPIS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | RICHARD WALKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | WILLIAM WELD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | DOUGLAS MCGARRAH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | THOMAS MCSHANE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | CHARLES HOLLEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | KATHERINE ABBOTT |
| 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/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 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/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIRMAN/DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| 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 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | CLERK/DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TREASURER/DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | DIRECTOR (LEFT 4/2017) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | DIRECTOR (LEFT 4/2017) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | DIRECTOR OF FINANCE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | PRESIDENT AND CEO |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1995 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 263558 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 1033600 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 21 |
| IRS990/GovernmentGrantsAmt | 0 | 97369 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 3303114 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 21 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 4338 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 4338 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 22755 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 80999 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 2746 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 2746 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 2 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 69362 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 16742 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 27379 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 96741 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| 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 | BOSTON HARBOR NOW, INC. (BHN) IS A NON-PROFIT ORGANIZATION WITH A BOLD MISSION: TO ENSURE A VIBRANT AND SUSTAINABLE FUTURE FOR BOSTON'S HARBOR, WATERFRONT, AND ISLANDS. BHN IS COMMITTED TO ACCESS, RESILIENCY, AND HARBOR'S ROLE IN THE HEALTH OF OUR REGION. BHN WORKS WITH PUBLIC AND PRIVATE PARTNERS TO INCREASE AWARENESS, ACCESS AND ENGAGEMENT WITH OUR HARBOR WHILE ENHANCING THE RESILIENCY OF OUR WATERFRONT. WE ARE THE LEGISLATED PARTNER OF THE BOSTON HARBOR ISLANDS NATIONAL AND STATE PARK AND THE CITY'S PARTNER OF THE HARBORWALK. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1559214 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 1709869 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 770042 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 770042 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 45770 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 45770 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 64529 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 64529 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 23403 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 23403 |
| IRS990/OtherExpensesGrp/Desc | 0 | PROGRAM EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 1 | WATER TRANSPORTATION |
| IRS990/OtherExpensesGrp/Desc | 2 | HARBOR IMPROVEMENTS |
| IRS990/OtherExpensesGrp/Desc | 3 | PROJECT EXPENSES |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 697527 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 359864 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 42807 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 40406 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 697527 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 359864 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 42807 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 40406 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 17576 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 17576 |
| IRS990/OtherRevenueTotalAmt | 0 | 17576 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 1012880 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 1012880 |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 79150 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 79150 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 75197 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 75197 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 801880 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 25669 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 62040 |
| IRS990/PrincipalOfficerNm | 0 | KATHERINE ABBOTT |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | 139630 |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | CONTRACT REVENUE |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | FERRY SERVICE REVENUE |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 72209 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 68470 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 72209 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 68470 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | BOSTON HARBOR NOW, INC. LEADS EFFORTS TO UNDERSTAND BOSTON'S RISKS FROM SEA LEVEL RISE AND OPPORTUNITIES TO SOLVE OTHER PRESSING CONCERNS SUCH AS PROTECTING THE CITY FROM FLOOD DAMAGE. |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | BOSTON HARBOR NOW, INC. DESIGNS, EXECUTES AND COORDINATES A WIDEPORTFOLIO OF PARK-ENRICHING PROJECTS, MARKETING, AND WATERFRONT PUBLICPROGRAMS AND ACTIVITIES. |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 2410764 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | -28884 |
| IRS990/PYOtherExpensesAmt | 0 | 1247101 |
| IRS990/PYOtherRevenueAmt | 0 | -28622 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 269023 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 97990 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1277190 |
| IRS990/PYTotalExpensesAmt | 0 | 2524291 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 2622281 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 11025 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 158255 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 911204 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 712504 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 2108513 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 2410764 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1553449 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 1307957 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1377752 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 8758435 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 2746 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 267 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 365 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 568 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1486 |