| IRS990/AccountantCompileOrReviewInd | 0 | false |
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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 367419 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 683 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 19608 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | To inspire love of the land and conservation of our treasured landscapes. |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 0 |
| IRS990/AllAffiliatesIncludedInd | 0 | false |
| IRS990/AllOtherContributionsAmt | 0 | 3861215 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 1974 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 8796 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 20705 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 31475 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | The Organization |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8316255523 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 509 Hartnell Street |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Monterey |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 93940 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | true |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 4555 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 120596 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 41831 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 138284 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 165593 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 345708 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 4600 |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 7330 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 11702 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 23632 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | true |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 109494 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 225 Crossroads Blvd 135 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | Carmel |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 93923 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | BW Engineering |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | Engineering & Design |
| IRS990/CreditCounselingInd | 0 | false |
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| IRS990/CYContributionsGrantsAmt | 0 | 4415270 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 11228 |
| IRS990/CYInvestmentIncomeAmt | 0 | 1544841 |
| IRS990/CYOtherExpensesAmt | 0 | 1900943 |
| IRS990/CYOtherRevenueAmt | 0 | 243829 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 2539203 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1752566 |
| IRS990/CYTotalExpensesAmt | 0 | 3664737 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 454802 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 6203940 |
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| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | true |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 26000 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 3200 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 4807 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 3962 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 41288 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 50057 |
| IRS990/Desc | 0 | Stewardship - The Big Sur Land Trust (BSLT) expends funds and initiates community partnerships to be effective stewards of both the BSLT's protected acreage as well as other important public and private lands. BSLT provides a high standard of stewardship for our ecological, cultural and scenic features that define the character of our properties and contribute to our natural and cultural heritage. Stewardship includes care of the facilities and amenities that ensure a high quality visitor experience; the standard of care balances ecological health and human use of the land. Around 100,000 people benefited. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
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| IRS990/DistributionToDonorInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 20 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 919740 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/FundraisingAmt | 0 | 1388 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 12470 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 11918 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 25776 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 10823 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 37702 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 48525 |
| IRS990/FeesForServicesLobbyingGrp/ManagementAndGeneralAmt | 0 | 61000 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 61000 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 111378 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 19366 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 827414 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 958158 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 72183 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 72183 |
| 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 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
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| 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/AverageHoursPerWeekRltdOrgRt | 16 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 17 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 18 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 19 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| 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/AverageHoursPerWeekRt | 16 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | 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/IndividualTrusteeOrDirectorInd | 17 | 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 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 23880 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 36511 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 30459 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Judy Sulsona |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Jim Andrasick |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Krista Hanni |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Nigel Lovett |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Ernest Chung |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Julie Drezner |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Thomas Reeves |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Sarah Berling |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Kurt Gollnick |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Thomas Archibald |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Chuck Winston |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Steve McIntyre |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | John Gamble |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Alfred Diaz-Infante |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Will Lewellyn |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | Larry Oda |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | George Somero |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | Dan Lee |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | Jeannette Tuitele-Lewis |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | Richard Hamilton |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | Rachel Saunders |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 121522 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 101866 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Board Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Trustee |
| 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 | Vice Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | COO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Dir. Conservation |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1978 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 1269472 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 18 |
| IRS990/GovernmentGrantsAmt | 0 | 554055 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 11228 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 11228 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | true |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 4704294 |
| IRS990/GrossReceiptsAmt | 0 | 9638762 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 171432 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 18 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 3068 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 28882 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 45389 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 77339 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 937 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 5390 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 8053 |
| IRS990/InterestGrp/TotalAmt | 0 | 14380 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 275369 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 275369 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 12140766 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 13101917 |
| IRS990/InvestTaxExemptBondsInd | 0 | false |
| IRS990/IRPDocumentCnt | 0 | 39 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 552202 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1310206 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1384512 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1936714 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 3434822 |
| IRS990/LicensedMoreThanOneStateInd | 0 | false |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | true |
| 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/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 4800 |
| IRS990/MiscellaneousRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 4800 |
| IRS990/MissionDesc | 0 | The mission of the Big Sur Land Trust is to inspire love of the land and conservation of our treasured landscapes. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 992223 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 858028 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 38676534 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 40845155 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 1269472 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 1269472 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 171432 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 171432 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 3800 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -437939 |
| IRS990/NoncashContributionsAmt | 0 | 233736 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1310 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 13026 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 86010 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 100346 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 14082 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 32163 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 41798 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 88043 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OnBehalfOfIssuerInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OrgFiledInLieuOfForm1041Ind | 0 | false |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 23543871 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 23494155 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 67357 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 32927 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 30700 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 121542 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 185169 |
| IRS990/OtherExpensesGrp/Desc | 0 | Conservation Improvements |
| IRS990/OtherExpensesGrp/Desc | 1 | Repairs & maintenance |