| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 5163 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 35392 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | TO ACQUIRE AND PRESERVE AMERICA'S MOST IMPORTANT ARCHAEOLOGICAL SITES. THE CONSERVANCY IDENTIFIES IMPORTANT ENDANGERED SITES, ACQUIRES THE PROPERTY BY PURCHASE, GIFT OR BARGAIN SALE FROM DONORS, SECURES THE PROPERTY AND STABILIZES THE CULTURAL RESOURCES AT THE SITE, MANAGES THE ARCHAEOLOGICAL PRESERVE AS PART OF A LONG-TERM PLAN, AND EDUCATES THE GENERAL PUBLIC AND LOCAL OFFICIALS ABOUT THE DESTRUCTION OF OUR CULTURAL HERITAGE AND HOW TO PRESERVE WHAT REMAINS. |
| IRS990/AllOtherContributionsAmt | 0 | 3913788 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 4901 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 17224 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 196357 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 218482 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1 | 0 | THE ARCHAEOLOGICAL CONSERVANCY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5052661540 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1 | 0 | 1717 GIRARD BLVD NE |
| IRS990/BooksInCareOfDetail/USAddress/City | 0 | ALBUQUERQUE |
| IRS990/BooksInCareOfDetail/USAddress/State | 0 | NM |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCode | 0 | 87106 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 8897 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 38633 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 99033 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 368200 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 505866 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | true |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | true |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 4515627 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 46529 |
| IRS990/CYOtherExpensesAmt | 0 | 1697779 |
| IRS990/CYOtherRevenueAmt | 0 | 60271 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 634235 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 2062076 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1496807 |
| IRS990/CYTotalExpensesAmt | 0 | 3194586 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 333393 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 5256662 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | true |
| IRS990/DeductibleNonCashContriInd | 0 | true |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 60626 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 91195 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 548 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 892 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 6263 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 7703 |
| IRS990/Desc | 0 | ACQUISITION, CONSERVATION AND MANAGEMENT: DURING THE YEAR ENDED JULY 31, 2014, THE CONSERVANCY COMPLETED THE ACQUISITION OF 15 ENDANGERED ARCHAEOLOGICAL SITES WHICH ARE NOW MANAGED AS ARCHAEOLOGICAL PRESERVES. 46 MORE SITES ARE IN VARIOUS STAGES OF ACQUISITION. IN ALL, THE CONSERVANCY HAS PRESERVED OVER 450 ARCHAEOLOGICAL SITES ACROSS THE COUNTRY, MAINTAINING SECURITY AND PROVIDING STABILIZATION AND OTHER MAINTENANCE SERVICES ON MOST OF THE PRESERVES. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 21 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountLiabilityGrp/EOYAmt | 0 | 70580 |
| IRS990/ExpenseAmt | 0 | 1491058 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 19527 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 19527 |
| IRS990/FeesForServicesLegalGrp/FundraisingAmt | 0 | 362 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 592 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 4152 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 5106 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.00 |
| 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 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1 | 0 | PAUL GARDNER |
| 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/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 12483 |
| 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 | 9244 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 7483 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 6763 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | MARK T MICHEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | CECIL F ANTONE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | CAROL CONDIE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | JANET M CREIGHTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JERRY GOLDEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | W JAMES JUDGE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JAY T LAST |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | DORINDA OLIVER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | RODDY STANTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | GORDON WILSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | LESLIE MASSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | BILL LIPE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | JAMES B WALKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | TIONE JOSEPH |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 157042 |
| 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 | 116042 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 94041 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 84542 |
| 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/TitleTxt | 0 | PRESIDENT |
| 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 | CHAIRMAN |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | VICE PRESIDE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | VICE PRESIDE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | CHIEF FINANC |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1979 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -22039 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 3575123 |
| IRS990/GrossReceiptsAmt | 0 | 8853824 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 15695 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 11 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 4332 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 8664 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 8664 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 21660 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 25866 |
| IRS990/InterestGrp/TotalAmt | 0 | 25866 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 68568 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 68568 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2618942 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 1897761 |
| IRS990/IRPDocumentCnt | 0 | 108 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/JointCostsInd | 0 | X |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 28922 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 310490 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 369215 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 398137 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 3597162 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembershipDuesAmt | 0 | 601839 |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | TO ACQUIRE AND PRESERVE AMERICA'S MOST IMPORTANT ARCHAEOLOGICAL SITES. THE CONSERVANCY IDENTIFIES IMPORTANT ENDANGERED SITES, ACQUIRES THE PROPERTY BY PURCHASE, GIFT OR BARGAIN SALE FROM DONORS, SECURES THE PROPERTY AND STABILIZES THE CULTURAL RESOURCES AT THE SITE, MANAGES THE ARCHAEOLOGICAL PRESERVE AS PART OF A LONG-TERM PLAN, AND EDUCATES THE GENERAL PUBLIC AND LOCAL OFFICIALS ABOUT THE DESTRUCTION OF OUR CULTURAL HERITAGE AND HOW TO PRESERVE WHAT REMAINS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 588431 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 545211 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 36081604 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 38259750 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | -22039 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -22039 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 15695 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 15695 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 116070 |
| IRS990/NoncashContributionsAmt | 0 | 2096629 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1154 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 1880 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 13194 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 16228 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 3029 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 4934 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 34631 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 42594 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 34136537 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 36120631 |
| IRS990/OtherExpensesGrp/Desc | 0 | EDUC. COMMUNICATIONS |
| IRS990/OtherExpensesGrp/Desc | 1 | EDUC. TOURS & SEMINARS |
| IRS990/OtherExpensesGrp/Desc | 2 | AMER ARCH MAGAZINE |
| IRS990/OtherExpensesGrp/Desc | 3 | REGIONAL OFFICE EXPENSES |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 204069 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 4281 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 796 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 14314 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 2387 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 329270 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 440029 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 209770 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 108247 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 547653 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 440029 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 214051 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 111430 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 449584 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 431997 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | AMER ARCH MAGAZ SALES |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | CAUSE RELATED ADVERTISING |
| IRS990/OtherRevenueMiscGrp/Desc | 2 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 16551 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 1 | 13268 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 2 | 10136 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 16551 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | 13268 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 2 | 10136 |
| IRS990/OtherRevenueTotalAmt | 0 | 39955 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 53716 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 59356 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 654622 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 767694 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 6617 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 7312 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 80644 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 94573 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 9003 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 9949 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 109722 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 128674 |
| IRS990/PermanentlyRstrNetAssetsGrp/BOYAmt | 0 | 951867 |
| IRS990/PermanentlyRstrNetAssetsGrp/EOYAmt | 0 | 951867 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 853102 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 29460 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 38459 |
| IRS990/PrincipalOfficerNm | 0 | MARK MICHEL |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | EDUCATIONAL TOURS & SEMINARS |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 634235 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 634235 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | EDUCATION: DURING THE YEAR ENDED JULY 31, 2014, THE CONSERVANCY PUBLISHED FOUR ISSUES OF THE AMERICAN ARCHAEOLOGY MAGAZINE, WHICH WERE DISTRIBUTED THROUGHOUT THE UNITED STATES WITH A TOTAL DISTRIBUTION OF APPROXIMATELY 30,000 COPIES PER ISSUE. PUBLIC LECTURE SERIES WERE HELD IN NEW MEXICO AND MONTANA. NINE ARCHAEOLOGICAL TRAVEL SEMINARS WERE HELD IN THE UNITED STATES, PERU, AND MESOAMERICA. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 1120891 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 664054 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 2927303 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 312291 |
| IRS990/PYOtherExpensesAmt | 0 | 1466984 |
| IRS990/PYOtherRevenueAmt | 0 | 68950 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 475746 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 864213 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1453093 |
| IRS990/PYTotalExpensesAmt | 0 | 2920077 |
| IRS990/PYTotalRevenueAmt | 0 | 3784290 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 2062076 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 15695 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | true |
| IRS990/ReportOtherLiabilitiesInd | 0 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 20316 |
| IRS990/RoyaltiesRevenueGrp/ExclusionAmt | 0 | 4621 |
| IRS990/RoyaltiesRevenueGrp/TotalRevenueColumnAmt | 0 | 4621 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 81082 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 154957 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 4515627 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 2927303 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 2985477 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 6196755 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 3746459 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 20371621 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 88884 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 334017 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 310843 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 299565 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 192551 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 1225860 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 674190 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.76500 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.76600 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 16522211 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 3849410 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 4515627 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 2927303 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 2985477 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 6196755 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 3746459 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 20371621 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 21597481 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | true |
| IRS990ScheduleD/AgentTrusteeEtcInd | 0 | false |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 308002 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 4677 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 312679 |
| IRS990ScheduleD/CYEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 1017428 |
| IRS990ScheduleD/CYEndwmtFundGrp/EndYearBalanceAmt | 0 | 1023727 |
| IRS990ScheduleD/CYEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 112570 |
| IRS990ScheduleD/CYEndwmtFundGrp/OtherExpendituresAmt | 0 | 106271 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 1230647 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 1017428 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 151925 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 365144 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 1241210 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 1230647 |