| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 295681 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 340100 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 34510 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 196444 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | ISLAND CONSERVATION PREVENTS EXTINCTIONS BY REMOVING INVASIVE SPECIES FROM ISLANDS. |
| IRS990/AllOtherContributionsAmt | 0 | 4936501 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 38786 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | -326100 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 315542 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 28228 |
| IRS990/AmendedReturnInd | 0 | X |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | JIM WESTBROOK |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8312399821 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 2100 DELAWARE AVENUE SUITE 1 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | SANTA CRUZ |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 95060 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 397318 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 3263529 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 76868 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 219553 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 94836 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 391257 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 189217 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 2238 KACHEMAK DRIVE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | HOMER |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | AK |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 99603 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | PATHFINDER AVIATION |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | HELICOPTER CHARTER SERVICES |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 6709326 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 100000 |
| IRS990/CYInvestmentIncomeAmt | 0 | -58407 |
| IRS990/CYOtherExpensesAmt | 0 | 2505983 |
| IRS990/CYOtherRevenueAmt | 0 | -3743 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 118066 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 316568 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 3842691 |
| IRS990/CYTotalExpensesAmt | 0 | 6448674 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 647426 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 6765242 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 49156 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 49156 |
| IRS990/Desc | 0 | CONSERVATION OPERATIONS: ISLANDS REPRESENT APPROX. 5% THE WORLD'S LAND AREA, YET ARE BIODIVERSITY HOTSPOTS THAT HAVE HOSTED 75% OF BIRD, MAMMAL, AMPHIBIAN AND REPTILE EXTINCTIONS SINCE 1500. THE MAJORITY OF THESE EXTINCTIONS ARE CAUSED BY INVASIVE SPECIES. WORKING TOGETHER WITH LOCAL COMMUNITIES, GOVERNMENT MANAGEMENT AGENCIES, AND CONSERVATION ORGANIZATIONS, WE CAN REMOVE INVASIVE SPECIES FROM ISLAND. THIS INTERVENTION ALLOWS THE OPPORTUNITY FOR NATIVE PLANTS AND ANIMALS TO RECOVER. SINCE 1994, ISLAND CONSERVATION AND OUR PARTNERS HAVE PROTECTED 994 POPULATIONS OF 389 SPECIES ON 53 ISLANDS. IN 2016, ISLAND CONSERVATION PARTNERED WITH 128 ORGANIZATION TO PROTECT THREATENED SPECIES IN TONGA, DOMINICAN REPUBLIC, NEW ZEALAND, CANADA, AND CHILE. SPECIES BENEFITTING FROM THIS WORK INCLUDE THE CRITICALLY ENDANGERED RICORD'S IGUANA ON CABRITOS ISLAND, THE ENDANGERED ERECT-CRESTED PENGUIN ON ANTIPODES ISLAND, AND ENDANGERED PERUVIAN DIVING-PETREL ON CHA ARAL ISLAND. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 34 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 4522974 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditPerformedInd | 0 | 1 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 1 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 26833 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 20494 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 47327 |
| IRS990/FeesForServicesLegalGrp/FundraisingAmt | 0 | 1750 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 22279 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 9021 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 33050 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 74273 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 74167 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 402488 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 550928 |
| IRS990/ForeignActivitiesInd | 0 | 1 |
| IRS990/ForeignCountryCd | 0 | CI |
| IRS990/ForeignCountryCd | 1 | BF |
| IRS990/ForeignCountryCd | 2 | EC |
| IRS990/ForeignFinancialAccountInd | 0 | 1 |
| IRS990/ForeignOfficeInd | 0 | 1 |
| 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 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | 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/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/OfficerInd | 6 | 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 | 3260 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 31214 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 13393 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 28836 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 28628 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 15652 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 13000 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 13000 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | DAVID HARTWELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ANGUS PARKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | RICHARD MCCOMBS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | STEPHANIE MCAULIFFE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JONATHAN HOEKSTRA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | INGRID PARKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | DANIEL SIMBERLOFF |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | MIKE SWEENEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | OLIVIER LANGRAND |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | TERI GRAFF-PULVINO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | WILLIAM WALDMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | JOE BEEK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | KAREN POIANI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | BRAD KEITT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | NICHOLAS HOLMES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | HEATH PACKARD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | GREGG HOWALD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | KARL CAMPBELL |
| 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 | 106246 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 132295 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 104852 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 135795 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 131753 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 122392 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 107669 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 110125 |
| 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/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | CEO (UNTIL 06/2016) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CHIEF OPERATING OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | CEO (AS OF 06/2016) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR OF CONSERVATION OPERATIONS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR OF SCIENCE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | DIRECTOR OF COMMUNICATIONS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | NORTH AMERICAN REGIONAL DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | PROJECT DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1997 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | -60163 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GovernmentGrantsAmt | 0 | 1772825 |
| IRS990/GrantAmt | 0 | 100000 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 100000 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 100000 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 6825405 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 10 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 7 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 60479 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 60479 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 45427 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 45427 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 1756 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 1756 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 13 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 183047 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 138317 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 55023 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 238070 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 60163 |
| 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 | ISLAND CONSERVATION PREVENTS EXTINCTIONS BY REMOVING INVASIVE SPECIES FROM ISLANDS, WHERE THE WORLD'S MOST THREATENED PLANTS AND ANIMALS ARE FOUND. WHEN WE INTERVENE TO PREVENT EXTINCTIONS CAUSED BY INVASIVE SPRCIES WE ALSO PROTECT ISLAND ECONOMIES, HEALTH, AND CULTURES. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 5988059 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 6304627 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | -60163 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -60163 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoncashContributionsAmt | 0 | 83691 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 9087 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 177363 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 14303 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 200753 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 14796 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 117979 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 441746 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 574521 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 28269 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 56979 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 48198 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 27570 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 313597 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 389365 |
| IRS990/OtherExpensesGrp/Desc | 0 | CHARTERS |
| IRS990/OtherExpensesGrp/Desc | 1 | PROFESSIONAL DEVELOPMEN |
| IRS990/OtherExpensesGrp/Desc | 2 | BOOKS AND SUBSCRIPTIONS |
| IRS990/OtherExpensesGrp/Desc | 3 | PAYROLL PROCESSING FEES |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 2447 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 869 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 3 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 14938 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 10238 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 3 | 18242 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 276346 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 28812 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 8792 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 0 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 276346 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 46197 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 19899 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 18242 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 1 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS INCOME |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | FOREIGN CURRENCY GAIN/ |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 10660 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 1 | -14403 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 10660 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | -14403 |
| IRS990/OtherRevenueTotalAmt | 0 | -3743 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 308948 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 403012 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 2080688 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 2792648 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 30600 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 45224 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 136677 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 212501 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 5151 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 8863 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 42906 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 56920 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 2836106 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 1969604 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 51005 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 58190 |
| IRS990/PrincipalOfficerNm | 0 | KAREN POIANI |
| IRS990/ProfessionalFundraisingInd | 0 | 1 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 541900 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | CONTRACT INCOME |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 118066 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 118066 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | CONSERVATION MEASURES: TO ASSESS IF ISLAND RESTORATION EFFORTS ARE PROTECTING IMPERILED SPECIES, ISLAND CONSERVATION MONITORS, MEASURES AND MAPS TARGETED SPECIES AND THEIR HABITATS BEFORE AND AFTER OUR INTERVENTION. OUR CONSERVATION BIOLOGISTS RETURNED TO PALMYRA ATOLL, LINE ISLANDS FIVE YEARS AFTER THE REMOVAL OF INVASIVE RATS AND DOCUMENTED AN INCREASE IN NATIVE PLANT, CRAB, AND BIRD POPULATIONS. IN TOTAL, WE RECORDED OVER 10,000 HOURS OF AUDIO ON FIVE ISLANDS TO MONITOR WILDLIFE ON OUR PROJECT SITES. BY ANALYZING THIS ACOUSTIC DATA, WE CAN ENSURE NATIVE POPULATIONS ARE RECOVERING. THIS PROGRAM ALSO AUTHORED OR CO-AUTHORED 12 PEER-REVIEWED PUBLICATIONS IN 2016. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 241605 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 6132607 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 63333 |
| IRS990/PYInvestmentIncomeAmt | 0 | 36906 |
| IRS990/PYOtherExpensesAmt | 0 | 2166107 |
| IRS990/PYOtherRevenueAmt | 0 | 1744 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 226117 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 917815 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 3250119 |
| IRS990/PYTotalExpensesAmt | 0 | 5479559 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 6397374 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 316568 |
| 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 | 118066 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 2798215 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 1044958 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 5916138 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 6132607 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 3513354 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 8083573 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 5412245 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 29057917 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl170Grp/CurrentTaxYearMinus1YearAmt | 0 | 5000 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 6000 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl170Grp/TotalAmt | 0 | 11000 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 1756 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 2130 |