Liabilities / Assets
7th percentile
Higher debt load relative to assets than 7% of similar nonprofits.
EIN 04-2373794 • 501(c)3 • Nantucket, MA
Profile
The nantucket conservation foundation owns, protects, and stewards over 9,000 acres of land and coastal shoreline, conserves nantucket's rare and significant natural resources, and engages in impactful ecological research to inform resource management and further our knowledge of nantucket's unique ecosystems and species. We share our environmental expertise with the wider community and provide educational and recreational opportunities to encourage respectful enjoyment and appreciation of our properties.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
7th percentile
Higher debt load relative to assets than 7% of similar nonprofits.
Liabilities / Revenue
10th percentile
Higher debt load relative to revenue than 10% of similar nonprofits.
Net Margin
95th percentile
Higher net margin than 95% of similar nonprofits.
Top Officer Pay
19th percentile
Higher top officer pay than 19% of similar nonprofits.
Top officer pay equals 1.6% of source-year revenue.
Asset Growth
58th percentile
Faster asset growth than 58% of similar nonprofits.
Revenue Growth
55th percentile
Faster revenue growth than 55% of similar nonprofits.
Assets
Up$178,363,699
Up $12,866,455 (+7.8%) from 2023
Liabilities
Down$792,747
Down $121,395 (-13%) from 2023
Net Assets
Up$177,570,952
Up $12,987,850 (+7.9%) from 2023
Revenue
Up$17,537,027
Up $1,354,638 (+8.4%) from 2023
Expenses
Up$6,335,615
Up $2,081,002 (+49%) from 2023
Net Income
Down$11,201,412
Down $726,364 (-6.1%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
The mission of nantucket conservation foundation, inc. Is to assist in the preservation of nantucket's character by conserving, maintaining, and managing natural areas and to encourage an appreciation of the island's natural resources.
Land conservation in nantucket, massachusetts
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $130,554,637 | $132,797,411 | ▲ $2,242,774 |
| Investments in Publicly Traded Securities | $12,139,459 | $19,063,738 | ▲ $6,924,279 |
| Investments Other Securities | $17,672,845 | $16,350,382 | ▼ $1,322,463 |
| Pledges and Grants Receivable | $3,505,876 | $8,423,209 | ▲ $4,917,333 |
| Cash and Non-Interest-Bearing Accounts | $1,074,572 | $725,788 | ▼ $348,784 |
| Accounts Receivable | $40,586 | $488,168 | ▲ $447,582 |
| Receivables From Officers Etc | $466,742 | $466,742 | → $0 |
| Prepaid Expenses and Deferred Charges | $42,527 | $48,261 | ▲ $5,734 |
| Total Assets | $165,497,244 | $178,363,699 | ▲ $12,866,455 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $303,679 | $357,787 | ▲ $54,108 |
| Deferred Revenue | $500,000 | $334,173 | ▼ $165,827 |
| Other Liabilities | $110,463 | $100,787 | ▼ $9,676 |
| Total Liabilities | $914,142 | $792,747 | ▼ $121,395 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $147,469,407 | $153,846,447 | ▲ $6,377,040 |
| Net Assets With Donor Restrictions | $17,113,695 | $23,724,505 | ▲ $6,610,810 |
| Total Net Assets Fund Balance | $164,583,102 | $177,570,952 | ▲ $12,987,850 |
| Total Liabilities and Net Assets / Fund Balance | $165,497,244 | $178,363,699 | ▲ $12,866,455 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Land | $128,237,543 | - | $128,237,543 |
| Buildings | $2,016,960 | $1,875,135 | $3,892,095 |
| Equipment | $738,630 | $1,364,543 | $2,103,173 |
| Other Land Buildings | $1,804,278 | - | $1,804,278 |
| Other Securities | $16,350,382 | - | - |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $15,265,177 | $8,849 | ▲ $1,147,672 | $349,022 | $16,072,676 |
| 2023 | $14,201,032 | $14,915 | ▲ $1,267,240 | $218,010 | $15,265,177 |
| 2022 | $14,788,302 | $539,838 | ▼ $762,952 | $364,156 | $14,201,032 |
| 2021 | $13,745,317 | - | ▲ $1,365,221 | $322,236 | $14,788,302 |
| 2020 | $17,576,989 | - | ▲ $1,198,165 | $5,029,837 | $13,745,317 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Cormac Collier | President and CEO | FT | $250,893 | $31,845 | $282,738 |
| Karen C Beattie | Vice Pres. Science & Stewa | FT | $163,167 | $37,608 | $200,775 |
| Jennifer Karberg | Director Research & Partne | FT | $130,980 | $37,280 | $168,260 |
| Richard Mack | Properties Manager | FT | $105,932 | $27,720 | $133,652 |
| Nicholas J Larrabee | Director Land Management | FT | $110,904 | $16,542 | $127,446 |
| Donald Mack | Land Management | FT | $102,117 | $15,847 | $117,964 |
| Name | Title |
|---|---|
| John G Macfarlane Iii | Chair |
| Todd M Knutson | Vice Chair |
| Ande Grennan | Trustee |
| Ann B Oliver | Trustee |
| Colby Crenshaw | Trustee |
| Daphne Mitchell | Trustee |
| David Rattner | Trustee |
| David a Champoux | Trustee |
| Dr Diane Pearl | Trustee |
| Dr Geoffrey C Trussell | Trustee |
| Jenny Matthews | Trustee |
| Karen Grip | Trustee |
| Katie Keith | Trustee |
| Laura Hanson | Trustee |
| Lindsey Gund | Trustee |
| Lucinda Young | Trustee |
| Mary West | Trustee |
| Patrick Hehir | Trustee |
| Patrick S Wayland | Trustee |
| Rick Ulmer | Trustee |
| Sherwood Newell | Trustee |
| Stephen Bartram | Trustee |
| Marianne R Stanton | Clerk |
| James Meehan | Secretary |
| Charles K Gifford Jr | Treasurer |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Sumco Eco | Ecological Restoration | 2 CENTENNIAL DRIVE, Peabody, MA 01960 | $1,288,393 |
| Gilbert Holdgate Drilling | Ecological Restoration | 8 ROSE BUD LANE, Nantucket, MA 02554 | $176,000 |
| Fuss & O'neill INC | Grant Writing | 115 BROAD STREET, Boston, MA 02110 | $122,093 |
| Contribution Type | Contribution Count | Reported Amount | Valuation Method |
|---|---|---|---|
| Securities Publicly Traded | 22 | $1,708,742 | Nyse |
| Real Estate Other | 1 | $100,700 | Real Estate Assessment |
| Total Noncash Contributions | 23 | $1,809,442 | - |
| Line Item | Amount |
|---|---|
| Other Expenses | $3,845,344 |
| Salaries, Compensation, and Employee Benefits | $2,490,271 |
| Total Fundraising Expense | $826,741 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $1,205,432 | $182,712 | $362,614 | $1,750,758 |
| Fees for Services Other | $261,494 | $106,562 | $69,237 | $437,293 |
| Office Expenses | $87,054 | $69,810 | $254,413 | $411,277 |
| Depreciation Depletion | $295,615 | $56,308 | - | $351,923 |
| Other Employee Benefits | $179,332 | $54,376 | $49,224 | $282,932 |
| Current Officers, Directors, Trustees, and Key Employees | $150,538 | $50,179 | $50,179 | $250,896 |
| Fees for Service Investment Mgmnt Fees | - | $176,992 | - | $176,992 |
| Insurance | $141,319 | $19,769 | - | $161,088 |
| Payroll Taxes | $105,743 | $13,259 | $29,585 | $148,587 |
| Occupancy | $71,673 | $57,064 | - | $128,737 |
| Travel | $28,963 | $79,318 | $11,177 | $119,458 |
| Advertising | $1,800 | $71,154 | $312 | $73,266 |
| Fees for Services Accounting | - | $70,425 | - | $70,425 |
| Pension Plan Contributions | $47,898 | $9,200 | - | $57,098 |
| Fees for Services Legal | - | $14,928 | - | $14,928 |
| Other Expenses | $15,435 | $6,478 | - | $6,478 |
| Total Functional Expenses | $4,444,703 | $1,064,171 | $826,741 | $6,335,615 |
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $6,479,243 |
| Total Expenses per Form 990 | $6,335,615 |
| Expenses per Audited Statements | $6,158,623 |
| Expenses Not Reported on Form 990 | $320,620 |
| Expenses Not Reported on Financial Statements | $176,992 |
| Region | Activity | Services | Offices | Employees | Spending |
|---|---|---|---|---|---|
| Central America and the Caribbean - Antigua & Barbuda, Aruba, Bahamas, | Investments | - | - | - | $2,277,378 |
| Europe | Investments | - | - | - | $1,137,303 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $320,620 |
| Fundraising Gross Income | $59,350 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Run for Our Shores | $92,337 | - | $30,044 | - |
| Sunset at Sanford | $425,350 | $59,350 | $49,433 | $9,917 |
| Total Events | $550,401 | $59,350 | $320,620 | $-261,270 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Receivables from Officers, Directors, Trustees, and Key Employees | $466,742 | $466,742 | → $0 |
| Liability | Amount |
|---|---|
| Post Employment Benefit Payable | $94,026 |
| Annuity Payable | $6,761 |
“Before filing, the audit committee reviews the full form 990, while the full board receives a copy of the form 990 without schedule b, the donors list, for their review.”
“Each trustee, officer and advisor is required annually to complete a conflict of interest questionnaire. The questionnaire is then reviewed by the director of finance or ceo. Any actions that could be deemed conflicting, be it financial, property related or other, would be brought to the attention of the executive committee.”
“Compensation is determined by the president and ceo with the compensation committee for every level of staff. Officers and trustees are not paid. We have enlisted outside consultants to review and compare our salary structure to other comparable off island companies and on island companies as a frame of reference. Annually, all employees have a formal review with their department head recommending merit increases.”
“The organization's governing documents, conflict of interest policy, and financial statements are available to the public upon request. The foundation responds to all requests by mailing a copy of the requested document to the party making the request.”
“The foundation's endowment consists of individual donor-restricted funds established for a variety of purposes as well as funds designated by the board of trustees to function as endowments. As required by generally accepted accounting principles, net assets associated with endowment funds are classified and reported based on the existence or absence of donor-imposed or legal restrictions. As required by generally accepted accounting principles, the foundation classifies as non-expendable donor-restricted net assets (a) the original value of gifts donated to the permanent endowment, (b) the original value of subsequent gifts to the permanent endowment, and (c) accumulations to the permanent endowment made in accordance with the direction of the applicable donor gift instrument at the time the accumulation is added to the fund. The remaining portion of the donor-restricted endowment fund that is not classified as non-expendable net assets is classified as expendable net assets until those amounts are appropriated for expenditure by the foundation in a manner consistent with the standard of prudence prescribed by state law. The foundation manages its endowment consistent with the uniform prudent management of institutional funds act ("upmifa"). In accordance with upmifa, the foundation may consider the following factors in making a determination to appropriate or accumulate donor-restricted endowment funds: the duration and preservation of the fund; the purposes of the foundation and the donor-restricted endowment fund; general economic conditions; the possible effect of inflation and deflation; the expected total return from income and the appreciation of investments; other resources of the foundation; and the investment policies of the foundation. Return objectives and risk parameter the foundation has adopted investment and spending policies for endowment assets that attempt to provide a predictable stream of funding to programs supported by its endowment while seeking to maintain the purchasing power of the endowment assets. Endowment assets include those assets of donor restricted funds that the foundation must hold in perpetuity or for a donor specified period as well as board designated funds. Under this policy, as approved by the board of trustees, the endowment assets are invested in a manner that is intended to produce a 4.5% real return on invested capital while assuming a conservative level of investment risk. Actual returns in any given year may vary from this amount. Strategies employed for achieving objects to satisfy its long- term rate-of-return objectives, the foundation relies on a total return strategy in which investment returns are achieved through both capital appreciation (realized and unrealized) and current yield (interest and dividends). The foundation targets a diversified asset allocation that places a greater emphasis on equity-based investments to achieve its long-term return objectives within prudent risk constraints. Spending policy and how the investment objectives relate to spending policy the foundation has a policy of appropriating for spending each year 4.5% of its endowment funds' average fair value over the most recent prior 12 calendar quarters preceding the fiscal year in which the draw is planned. Any expenditures from the endowment assets must be supported by the finance and investment committees and be consistent with the intent of the relevant donor for that fund. This is consistent with the foundation's objective to ensure that the future growth of the endowment assets is sufficient to offset normal inflation plus reasonable spending, thereby preserving the constant dollar value and purchasing power of the endowment assets held for future generations as well as to provide additional real growth through new gifts and investment return. Board designated funds without donor restrictions for operations and land purchases are supported by investment gains, dividends and interest as well”
“Special event expenses 320,620.”
“Special event expenses 320,620.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 303679 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 357787 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 40586 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 488168 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | LAND CONSERVATION IN NANTUCKET, MASSACHUSETTS |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 312 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 71154 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 1800 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 73266 |
| IRS990/AllOtherContributionsAmt | 0 | 15853578 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | KORILYNN ADAMS |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5082282884 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | PO BOX 13 118 CLIFF ROAD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | NANTUCKET |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02254 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1074572 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 725788 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 50179 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 50179 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 150538 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 250896 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 1288393 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 176000 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 122093 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 2 CENTENNIAL DRIVE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 8 ROSE BUD LANE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 115 BROAD STREET |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | PEABODY |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | NANTUCKET |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | BOSTON |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 01960 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 02554 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 02110 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | SUMCO ECO |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | GILBERT HOLDGATE DRILLING |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | FUSS & O'NEILL INC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | ECOLOGICAL RESTORATION |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | ECOLOGICAL RESTORATION |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | GRANT WRITING |
| IRS990/ContriRptFundraisingEventAmt | 0 | 491051 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 16344629 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 1290787 |
| IRS990/CYOtherExpensesAmt | 0 | 3845344 |
| IRS990/CYOtherRevenueAmt | 0 | -238070 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 139681 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 11201412 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 2490271 |
| IRS990/CYTotalExpensesAmt | 0 | 6335615 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 826741 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 17537027 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 500000 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 334173 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 56308 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 295615 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 351923 |
| IRS990/Desc | 0 | LAND MANAGEMENT: MAINTAINING OVER 9,000 ACRES OF OPEN SPACE, TRAILS SYSTEMS AND BEACHES FOR VISITORS TO ENJOY. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 17113695 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 23724505 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 32 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1917600 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 70425 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 70425 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 14928 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 14928 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 69237 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 106562 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 261494 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 437293 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 176992 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 176992 |
| IRS990/ForeignActivitiesInd | 0 | 1 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 25 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 26 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 27 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 28 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 29 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 30 | 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/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 23 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 24 | 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 25 | 31845 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 26 | 37608 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 27 | 15847 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 28 | 37280 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 29 | 27720 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 30 | 16542 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | ANDE GRENNAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JOHN G MACFARLANE III |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | CHARLES K GIFFORD JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | MARIANNE R STANTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | LUCINDA YOUNG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | TODD M KNUTSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | COLBY CRENSHAW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | DAVID A CHAMPOUX |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | KATIE KEITH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | SHERWOOD NEWELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | KAREN GRIP |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | DR DIANE PEARL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ANN B OLIVER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | DAVID RATTNER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | MARY WEST |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | DR GEOFFREY C TRUSSELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | PATRICK S WAYLAND |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | LINDSEY GUND |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | STEPHEN BARTRAM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | RICK ULMER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | LAURA HANSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | DAPHNE MITCHELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | JAMES MEEHAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | JENNY MATTHEWS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | PATRICK HEHIR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | CORMAC COLLIER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | KAREN C BEATTIE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 27 | DONALD MACK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | JENNIFER KARBERG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 29 | RICHARD MACK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 30 | NICHOLAS J LARRABEE |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 250893 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 26 | 163167 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 27 | 102117 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 130980 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 29 | 105932 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 30 | 110904 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 26 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 27 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 28 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 29 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 30 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | VICE CHAIR |
| 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 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | PRESIDENT AND CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | VICE PRES. SCIENCE & STEWA |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | LAND MANAGEMENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | DIRECTOR RESEARCH & PARTNE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 29 | PROPERTIES MANAGER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 30 | DIRECTOR LAND MANAGEMENT |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1963 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 491051 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 320620 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 59350 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 19250 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 645159 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 25 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 19250 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 6916559 |
| IRS990/GrossReceiptsAmt | 0 | 24129047 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 20200 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 24 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 19769 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 141319 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 161088 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 626378 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 626378 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 17672845 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 16350382 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 12139459 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 19063738 |
| IRS990/IRPDocumentCnt | 0 | 22 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 3239678 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 130554637 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 132797411 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 136037089 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 0 |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 6271400 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 1 |
| 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 | THE NANTUCKET CONSERVATION FOUNDATION OWNS, PROTECTS, AND STEWARDS OVER 9,000 ACRES OF LAND AND COASTAL SHORELINE, CONSERVES NANTUCKET'S RARE AND SIGNIFICANT NATURAL RESOURCES, AND ENGAGES IN IMPACTFUL ECOLOGICAL RESEARCH TO INFORM RESOURCE MANAGEMENT AND FURTHER OUR KNOWLEDGE OF NANTUCKET'S UNIQUE ECOSYSTEMS AND SPECIES. WE SHARE OUR ENVIRONMENTAL EXPERTISE WITH THE WIDER COMMUNITY AND PROVIDE EDUCATIONAL AND RECREATIONAL OPPORTUNITIES TO ENCOURAGE RESPECTFUL ENJOYMENT AND APPRECIATION OF OUR PROPERTIES. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 164583102 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 177570952 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 645159 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | 19250 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 664409 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -261270 |
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