| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 87226 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 112127 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 85000 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | Muir Heritage Land Trust protects and cares for open space, ranches, farms, parkland, and shoreline in Contra Costa County. |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 0 |
| IRS990/AllOtherContributionsAmt | 0 | 1757683 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 5444 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 10845 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 1181 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 17470 |
| 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 | Neil Roscoe |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9252285460 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | PO Box 31 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Martinez |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 94553 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 134782 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1304914 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 12047 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 80286 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 148614 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 240947 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 2038 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 14843 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 1423 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 18304 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | true |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 4711683 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 25000 |
| IRS990/CYInvestmentIncomeAmt | 0 | 9754 |
| IRS990/CYOtherExpensesAmt | 0 | 3618811 |
| IRS990/CYOtherRevenueAmt | 0 | 648 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 42056 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 174051 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 946279 |
| IRS990/CYTotalExpensesAmt | 0 | 4590090 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 374297 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 4764141 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | true |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 4786 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 3421 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 14280 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 22487 |
| IRS990/Desc | 0 | During the year ended June 30, 2020, funds were expended in order to carry out John Muir Land Trust program goals to identify, evaluate, finance and acquire land (fee title, fee simple, conservation easement), and permanently protect, restore, and care for those natural areas that safeguard a wide-range of benefits including scenic beauty, natural resource and wildlife habitat protection, public recreation, public health, local agriculture, and clean water and air for the benefit of all in our region. For a complete discussion of the Land Trust's accomplishments, please visit the organization's website where additional information is available: www.jmlt.org |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1113708 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 1053588 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | true |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 16 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 3971143 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 13060 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 13060 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 560 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 560 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 32797 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 7851 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 71753 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 112401 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 1417 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 1417 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form1098CFiledInd | 0 | false |
| IRS990/Form8282FiledCnt | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form8899Filedind | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 40.00 |
| 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 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 2.00 |
| 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/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 | 7576 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 19129 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 1813 |
| 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/PersonNm | 0 | Linus Eukel |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Jay Dean |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Neil Roscoe |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Eliot Hudson |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Katie Hill |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Arthur Bart-Williams |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Bill Wadsworth |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Dawn Block |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Charles Lewis IV |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Stephanie Becker |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Peggy Cabaniss |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Jack Cortis |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Steve Kirby |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Eileen McCauley |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Ted C Radosevich |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | Karen Sakata |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 151513 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 103858 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 70595 |
| 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/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/TitleTxt | 0 | Executive Dir. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Creative Strat Dir |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | CFO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Vice Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Treasurer |
| 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/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1989 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 13 |
| IRS990/GovernmentGrantsAmt | 0 | 2954000 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 25000 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 25000 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | true |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 4764141 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 13 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 13162 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 9408 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 39273 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 61843 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 6146 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 4393 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 18338 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 28877 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/TotalAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 9754 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 9754 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 992961 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 9816 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 14 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 146659 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 89156 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 388857 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 535516 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LoanOutstandingInd | 0 | false |
| 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 | The vitality of open spaces is essential to the health of our earth, air, water, native plants, and animals. Our goal is to ensure that the beauty, diversity, and fullness of our wild lands continue to enrich and sustain all generations of life. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 15376502 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 18499741 |
| 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/NetUnrlzdGainsLossesInvstAmt | 0 | -4812 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 14262794 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 17446153 |
| IRS990/NoncashContributionsAmt | 0 | 86282 |
| IRS990/NondeductibleContributionsInd | 0 | true |
| IRS990/NondeductibleContriDisclInd | 0 | true |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 7886 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 5637 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 23529 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 37052 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 10442 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 4899 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 20453 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 35794 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 13588673 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 16526406 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 2954000 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 17020 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 12165 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 50785 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 79970 |
| IRS990/OtherExpensesGrp/Desc | 0 | Land acquisition |
| IRS990/OtherExpensesGrp/Desc | 1 | Printing and Publications |
| IRS990/OtherExpensesGrp/Desc | 2 | Land stewardship |
| IRS990/OtherExpensesGrp/Desc | 3 | Postage and Shipping |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 74556 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 12926 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 15259 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 1918 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 3002887 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 81640 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 66810 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 3468 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 3002887 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 171455 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 66810 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 18312 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 182508 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 167048 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 110000 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | Other Income |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 648 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 648 |
| IRS990/OtherRevenueTotalAmt | 0 | 648 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 153693 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 38184 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 345945 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 537822 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 0 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 12381 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 8850 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 36946 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 58177 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 6249 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 4467 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 18647 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 29363 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 455000 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 203750 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 220806 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 121494 |
| IRS990/PrincipalOfficerNm | 0 | Linus Eukel |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 110000 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 110000 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Cell tower rent |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | Grazing Revenue |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 28654 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 13402 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 28654 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 13402 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 2628864 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 21955 |
| IRS990/PYInvestmentIncomeAmt | 0 | 63798 |
| IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt | 0 | 0 |
| IRS990/PYOtherExpensesAmt | 0 | 1534606 |
| IRS990/PYOtherRevenueAmt | 0 | 138312 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 5647 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 473881 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 806179 |
| IRS990/PYTotalExpensesAmt | 0 | 2362740 |
| IRS990/PYTotalRevenueAmt | 0 | 2836621 |
| IRS990/QuidProQuoContributionsInd | 0 | false |
| IRS990/RcvblFromDisqualifiedPrsnGrp/EOYAmt | 0 | 0 |