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Schedule of Maturities, at Par, of Marketable Securities by Year Investments Classified by Contractual Maturity Date [Table Text Block] Target performance (in shares) Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, at Target Performance Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, at Target Performance Percentage rent Operating Lease, Lease Income, Percentage Rent Operating Lease, Lease Income, Percentage Rent Award Type [Axis] Award Type [Axis] Net deferred taxes Deferred Tax Liabilities, Net Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Auditor Attestation Flag ICFR Auditor Attestation Flag Total liabilities Liabilities Non-controlling interest Equity, Attributable to Noncontrolling Interest Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Cost of sales Cost of sales of water Cost of Purchased Water Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Accrued capital and water expenditures included in current liabilities Change In Capital Expenditures Incurred But Not Yet Paid Change In Capital Expenditures Incurred But Not Yet Paid Tejon Ranch Commerce Center Inventory, Real Estate, Improvements, Gross Inventory, Real Estate, Improvements, Gross Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Total Shareholder Return Amount Total Shareholder Return Amount Difference between total income tax expense and the amount computed by applying the statutory Federal income tax rate to income before taxes: Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Annual fee increase, percent Long Term Water Assets, Purchased, Annual Fee Increase, Percent Long Term Water Assets, Purchased, Annual Fee Increase, Percent Special taxes paid Taxes, Other Amounts expected to be recognized as component of net periodic pension costs during the next fiscal year: Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Amount recorded, net of taxes Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Water Water [Member] Property and equipment, gross Property, Plant and Equipment, Gross Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted August 21, 2023 August 21, 2023 [Member] August 21, 2023 MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total Tejon Ranch Co. stockholders’ equity Equity, Attributable to Parent Grapevine Grapevine [Member] Grapevine [Member] Total deferred income tax assets Deferred Tax Assets, Gross SWP Contracts State Water Project Contracts [Member] State water project contracts. Dudley-Ridge water purchase contract Dudley Ridge Water Rights [Member] Dudley Ridge Water Rights [Member] Balance Sheet Information Equity Method Investment, Summarized Financial Information [Abstract] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Investment income Investment Income, Net Vineyards and orchards Vineyards and Orchards [Member] Vineyards and Orchards [Member] Cash and Cash Equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Common stock equivalents-stock options, grants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Contribution to unconsolidated joint venture Contribution of Property ASSETS Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Other comprehensive income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Debt instrument, interest rate, effective percentage Debt Instrument, Interest Rate, Effective Percentage Pastoria Energy Facility, LLC Pastoria Energy Facility, LLC [Member] Pastoria Energy Facility, LLC [Member] Derivative Contract [Domain] Derivative Contract [Domain] Actuarial (gain)/loss assumption changes Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Purchase of marketable securities Payments to Acquire Marketable Securities Defined Benefit Plan [Table] Defined Benefit Plan [Table] Petro Travel Plaza Holdings LLC Petro Travel Holdings Llc Plaza [Member] Petro travel holdings llc plaza. 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Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total equity Beginning balance, value Ending balance, value Equity (Deficit) Equity, Including Portion Attributable to Noncontrolling Interest Components of deferred tax assets and liabilities: Components of Deferred Tax Assets and Liabilities [Abstract] Name Awards Close in Time to MNPI Disclosures, Individual Name Development in process Construction in Progress [Member] Real estate development (includes $124,136 at December 31, 2024 and $119,788 at December 31, 2023, attributable to Centennial Founders, LLC, Note 16) Real estate development Real estate development Inventory, Real Estate, Land and Land Development Costs Marketable securities with unrecognized losses for less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Entity Filer Category Entity Filer Category Deferred revenue Revenue, Remaining Performance Obligation, Amount Schedule of Future Minimum Rental Income Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Number of joint venture contracts Number of Joint Venture Contracts Number of joint venture contracts. Statistical Measurement [Domain] Statistical Measurement [Domain] Gross unrealized holding losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax March 17 2022 March 17, 2022 [Member] March 17, 2022 Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] June 16, 2023 June 16, 2023 [Member] June 16, 2023 Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Schedule of Components of Water Assets Disclosure of Long-Lived Assets Held-for-Sale [Table Text Block] Schedule of Stock Compensation Costs for Employee and NDSI Plans Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Area of land Area of Land Investment in unconsolidated joint ventures Equity Method Investments Tejon Ranch Commerce Center - Commercial Tejon Ranch Commerce Center - Commercial [Member] Tejon Ranch Commerce Center - Commercial Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount TRCC/Rock Outlet Center, LLC TRCC/Rock Outlet Center [Member] TRCC/Rock Outlet Center [Member] Schedule of Other Liabilities Other Liabilities [Table Text Block] SERP liability adjustments Supplemental Employee Retirement Plan [Member] Other Performance Measure, Amount Other Performance Measure, Amount Rate of increase in periodic pension costs Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Unrealized gain (loss) on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Common stock, outstanding shares (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding TRC-MRC 3, LLC TRC-MRC 3 LLC [Member] TRC-MRC 3 LLC [Member] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Amortization of net gain/(loss) Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid (Gain) loss on sale of real estate/assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Deferred income Contract with Customer, Liability, Current Federal Federal Income Tax Expense (Benefit), Continuing Operations Water holding costs Water Holding Costs Water Holding Costs Profit from land sales Proceeds from Sale of Real Estate Entity Tax Identification Number Entity Tax Identification Number Equities Defined Benefit Plan, Equity Securities [Member] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] AVEK water for future delivery (in acre-feet) Long-term Water Assets, Water Contract Rights for Future Delivery (Volume) Long-term Water Assets, Water Contract Rights for Future Delivery (Volume) Retirement Plan Type [Axis] Retirement Plan Type [Axis] Money Market Funds Money Market Funds [Member] Transferable water Transferable Water [Member] Transferable water. Abandonment expense Impairment, Oil and Gas, Property with Unproved Reserve STOCK COMPENSATION - RESTRICTED STOCK AND PERFORMANCE SHARE GRANTS Stock Compensation Restricted Stock and Performance Share Grants [Text Block] Stock compensation restricted stock and performance share grants. Operating expenses Operating expenses Other Cost and Expense, Operating Number of types of stock grant awards Share Based Compensation Arrangement by Share Based Payment Award, Number of Award Types Share Based Compensation Arrangement by Share Based Payment Award, Number of Award Types Plan Name [Axis] Plan Name [Axis] Equity Components [Axis] Equity Components [Axis] Simulated Monte Carlo share price (in dollars per share) Share based Compensation Arrangement by Share based Payment Award Simulated Price Share based Compensation Arrangement by Share based Payment Award Simulated Price Excess distributions resulting in deficit balance Distributions in Excess of Investment in Unconsolidated Joint Venture Distributions in Excess of Investment in Unconsolidated Joint Venture Time-Based Cash-Settled Awards Time-Based Cash-Settled Awards [Member] Time-Based Cash-Settled Awards Additional reimbursement funds Additional Reimbursement Funds Additional reimbursement funds. Capitalized Share-Based Payment Arrangement, Amount Capitalized Total expenses Costs and expenses Corporate expenses Costs and expenses Costs and Expenses Net actuarial loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax State deferred taxes Deferred Tax Assets, State Taxes Reconciling items: Segment Reconciliation [Abstract] East CFD East Community Facilities Districts [Member] -- None. No documentation exists for this element. -- Geographical [Axis] Geographical [Axis] Unrealized interest rate swap gain Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Award Date [Axis] Award Date [Axis] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Accrued bonus Accrued Bonuses, Current Oil and mineral depletion Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount Cash, cash equivalents, and restricted cash at beginning of year Cash, cash equivalents, and restricted cash at end of year Total cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Amortization of (discount) premium on marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Compensation cost not yet recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Net (gain) loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Current Assets: Assets, Current [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] Fair Values of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] 18-19 West, LLC Eighteen Nineteen West Llc [Member] Eighteen nineteen west llc. Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Capitalized stock compensation Deferred Tax Liabilities, Capitalized Stock Compensation Deferred Tax Liabilities, Capitalized Stock Compensation Farming inventories Agricultural Related Inventory, Net of Reserves Agricultural Related Inventory, Net of Reserves Product and Service [Domain] Product and Service [Domain] Security Exchange Name Security Exchange Name Related Party Transaction [Domain] Related Party Transaction [Domain] Equity in Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Summary of stock grant activity: Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Refunds Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Current Current State and Local Tax Expense (Benefit) Compensation expenses Labor and Related Expense Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Available-for-sale Securities Debt Securities, Available-for-Sale [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Common stock, issued shares (in shares) Common Stock, Shares, Issued Recognition of net actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Entity [Domain] Entity [Domain] Line of credit facility Line of Credit Facility, Maximum Borrowing Capacity Percentage of revenue Concentration Risk, Percentage Revenues Revenue from Purchased Water Revenue from Purchased Water Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, authorized shares (in shares) Common Stock, Shares Authorized Company water bank Long-term Water Assets, Banked Water Held at Company Owned Water Bank (Volume) Long-term Water Assets, Banked Water Held at Company Owned Water Bank (Volume) Entity Voluntary Filers Entity Voluntary Filers Industrial Land Industrial Land [Member] Industrial Land Net amortization and deferral Net amortization and other Defined Benefit Plan, Amortization of Gain (Loss) Property Subject to or Available for Operating Lease, by Major Property Class [Table] Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table] Schedule of Real Estate Schedule of Real Estate Properties [Table Text Block] Deferred income taxes Deferred Income Tax Expense (Benefit) LONG-TERM WATER ASSETS Property, Plant and Equipment Disclosure [Text Block] Weighted-average discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Los Angeles, California Los Angeles, California [Member] Los Angeles, California [Member] Non-cash retirement plan expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Schedule Of Equity Method Investment Equity Method Investee Name Axis [Domain] Schedule Of Equity Method Investment Equity Method Investee Name Axis [Domain] Schedule Of Equity Method Investment Equity Method Investee Name Axis [Domain] Consolidated joint venture, ownership interest Subsidiary, Ownership Percentage, Parent Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Fair value of plan assets at beginning of year Fair value of plan assets at end of year Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Additional costs for future years Improvement Funds, Reimbursement Of Public Infrastructure Costs Improvement Funds, Reimbursement Of Public Infrastructure Costs Restricted stock issuance Stock Issued During Period, Value, Restricted Stock Award, Gross Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] TRCC-East TRCC-East [Member] TRCC-East [Member] Restricted stock issuance (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Investments in unconsolidated joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Document Annual Report Document Annual Report Vested grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Fair market value of investment securities exceeds cost basis Debt Securities, Available for Sale Securities, Fair Market Value Exceeds Cost Basis, by Amount Debt Securities, Available for sale securities, fair market value exceeds cost basis, by amount. Total Stockholders' Equity Parent [Member] Audit Information [Abstract] Audit Information Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Summary of income from commercial rents included in real estate revenue: Operating Leases, Income Statement, Lease Revenue [Abstract] Deferred financing costs Payments of Financing Costs Accounting Policies [Abstract] Accounting Policies [Abstract] Revenues: Revenues [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date PEO Name PEO Name Award Type [Domain] Award Type [Domain] 2025 Lessor, Operating Lease, Payment to be Received, Year One Stock grant expense Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Total water held for future use and purchased water contracts Long Term Water Assets, Contracts with Company Long Term Water Assets, Contracts with Company Non-PEO NEO Non-PEO NEO [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] RETIREMENT PLANS Retirement Benefits [Text Block] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount New Accounting Pronouncements Adopted and Climate Change Related Update by SEC Effective in Future Periods New Accounting Pronouncements, Policy [Policy Text Block] Interest rate swap Deferred Tax Assets, Derivative Instruments Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Accumulated Depreciation Finite-Lived Intangible Assets, Accumulated Amortization Schedule of Weighted Average Number of Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Receivables, inventories, prepaids and other assets, net Increase (Decrease) in Operating Assets Accrued vacation Accrued Vacation, Current Accrued stock compensation expense Accrued Employee Benefits, Current Income tax payments Income Taxes Paid Stock compensation expense Share-Based Payment Arrangement, Noncash Expense Schedule of Performance Share Grants with Performance Conditions Schedule of Share-based Payment Award, Performance Share Awards Granted, by Performance Conditions [Table Text Block] Schedule of Share-based Payment Award, Performance Share Awards Granted, by Performance Conditions [Table Text Block] Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Commercial lease agreements, contract terms Lessor, Operating Lease, Term of Contract Corporate expenses Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Non-cash investing activities Supplemental Cash Flow Information [Abstract] TRC-MRC 1, LLC TRC-MRC 1 LLC [Member] TRC-MRC 1 LLC [Member] State State and Local Income Tax Expense (Benefit), Continuing Operations Total other income, net Nonoperating Income (Expense) Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Reduced outstanding amount Debt Instrument, Increase (Decrease), Net Auditor Firm ID Auditor Firm ID Effective tax rate Effective Income Tax Rate Reconciliation, Percent Operating (loss) income Operating Income (Loss) Permanent differences Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Distance from city Property Border, Distance to Major City Property Border, Distance to Major City Business segments Number of Reportable Segments TOTAL LIABILITIES AND EQUITY Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Marketable Securities Marketable Securities, Policy [Policy Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net deferred income tax (liability) Deferred Tax Assets (Liabilities), Gross Deferred Tax Assets (Liabilities), Gross Schedule of Long Lived Assets Held-for-sale [Table] Long-Lived Asset, Held-for-Sale [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Individual: Individual [Axis] Buildings and improvements Building and Building Improvements [Member] Shares withheld for taxes and tax benefit of vested shares Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Total water held for future use at cost Total cost of water held for future use Tangible Water Assets, Banked Water and Water Contract Rights Tangible Water Assets, Banked Water and Water Contract Rights Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Inventories Total Inventory, Net Product and Service [Axis] Product and Service [Axis] Measurement period from entitlement achievement date Contract Termination, Incentive Fee Calculation, Measurement Period From Entitlement Achievement Date Contract Termination, Incentive Fee Calculation, Measurement Period From Entitlement Achievement Date Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Real estate - commercial/industrial Real estate - commercial/industrial Commercial and Industrial [Member] Commercial and industrial. Statement [Line Items] Statement [Line Items] Banked water and water for future delivery Banked Water and Water for Future Delivery [Member] Banked water and water for future delivery. Mineral resources Mineral resources Mineral Resources [Member] Mineral Resources [Member] Benefits/expenses paid Defined Benefit Plan, Plan Assets, Benefits Paid Schedule of Property and Equipment and their Respective Useful Lives Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Interest Rate Swap Agreements Derivatives, Policy [Policy Text Block] Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date Long-Term Water Assets Long-term Water Assets [Policy Text Block] Long-term Water Assets [Policy Text Block] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Long-term deferred gains Contract with Customer, Liability, Noncurrent Interest cost Defined Benefit Plan, Expected Interest Cost, Next Fiscal Year Defined Benefit Plan, Expected Interest Cost, Next Fiscal Year Business Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Distribution of equity from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital Exercise Price Award Exercise Price Schedule of Components of Net Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Arrangement Duration Trading Arrangement Duration Schedule of Water Revenues and Cost of Sales Schedule of Water Revenues and Cost of Sales [Table Text Block] Schedule of Water Revenues and Cost of Sales [Table Text Block] Total changes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Tejon Ranch Co. stockholders’ equity Equity, Attributable to Parent [Abstract] Straight line rent Deferred Tax Liabilities, Straight Line Rent Deferred Tax Liabilities, Straight Line Rent Name of Property [Axis] Name of Property [Axis] Area of building owned and leased Lease of Building Lease of building. Recharged water Long-term Water Assets, Recharged Project Water (Volume) Long-term Water Assets, Recharged Project Water (Volume) Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Collective Funds Equity Funds [Member] All Individuals All Individuals [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Other (loss) income, net Other (loss) income Other Nonoperating Income (Expense) Consulting agreement term Related Party Transaction, Term Related Party Transaction, Term Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Interest cost Defined Benefit Plan, Interest Cost, Including Rounding Difference Defined Benefit Plan, Interest Cost, Including Rounding Difference Marketable securities with unrecognized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Change in Plan Assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Related Party [Domain] Related and Nonrelated Parties [Domain] TRC-MRC 5, LLC TRC-MRC 5 LLC [Member] TRC-MRC 5 LLC Schedule of Condensed Statements of Operations and Balance Sheet Information of Consolidated and Unconsolidated Joint Ventures Schedule of Condensed Income Statement and Balance Sheet Related to Joint Ventures [Table Text Block] Schedule of condensed income statement and balance sheet related to joint ventures. Pension adjustment Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Executive Vice President and Chief Operating Officer Management [Member] Deferred tax liability Deferred Income Tax Liabilities, Net Capitalization of costs Deferred Tax Assets, Deferred Expense, Capitalized Costs Deferred Tax Assets, Deferred Expense, Capitalized Costs Deferred gains Deferred Tax Liabilities, Tax Deferred Income Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Changes, net of taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Deferred Deferred Federal Income Tax Expense (Benefit) Schedule of Accrued Liabilities and Other Schedule of Accrued Liabilities [Table Text Block] Farming Farming Farming and Agriculture [Member] Farming and agriculture. Performance milestone ratio Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Performance Milestone Ratio Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Performance Milestone Ratio Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Non-cash profits recognized from land contribution Gain (Loss) on Disposition of Other Assets Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Change in benefit obligation - Pension Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Measure: Measure [Axis] Target share price (in dollars per share) Share Price Long Lived Assets Held-for-sale by Asset Type [Axis] Long-Lived Asset, Held-for-Sale, Type [Axis] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year One Entity Emerging Growth Company Entity Emerging Growth Company Acres of land Related Party Transaction, Area of Land Related Party Transaction, Area of Land Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Tulare Lake Basin water purchase contract Tulare Lake Basin Water Rights [Member] Tulare Lake Basin Water Rights [Member] Equity Component [Domain] Equity Component [Domain] Centennial Centennial Founders, LLC Centennial Founders, LLC Centennial Founders LLC [Member] Centennial Founders LLC Commitment and Contingencies Disclosure [Line Items] Commitment and Contingencies Disclosure [Line Items] Commitment and contingencies disclosure. Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code West CFD West Community Facilities Districts [Member] West community facilities districts. 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Four U.S. Treasury and agency notes US Treasury and Government Short-Term Debt Securities [Member] Statement [Table] Statement [Table] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Counterparty Name [Axis] Counterparty Name [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Revenues Segment Reporting Information, Revenue for Reportable Segment [Abstract] Percentage of building leased Percentage Of Building Leased Percentage Of Building Leased Acre-Feet Sold Long Term Water Assets, Water Sold (Volume) Long Term Water Assets, Water Sold (Volume) Level 1 Level 1 Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Total current assets Assets, Current Summary of maturities, at par, of marketable securities Available For Sale Debt Securities, Fiscal Year Maturity [Abstract] Available For Sale Debt Securities, Fiscal Year Maturity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Tejon-Castac Water District Tejon-Castac Water District [Member] Tejon-Castac Water District [Member] Deferred gain on sale Equity Method Investment, Deferred Gain on Sale Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer INCOME TAXES Income Tax Disclosure [Text Block] Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment in unconsolidated joint ventures Payments to Acquire Interest in Joint Venture Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Right and share of profit and loss Equity Method Investment, Right and Share of Income and (Loss) Equity Method Investment, Right and Share of Income and (Loss) Borrowings under joint venture Equity Method Investment Summarized Financial Information, Line of Credit Facility, Maximum Borrowing Capacity Equity Method Investment Summarized Financial Information, Line of Credit Facility, Maximum Borrowing Capacity Credit Facility [Axis] Credit Facility [Axis] Capital Expenditures Capital Expenditures Capital Expenditures Entity Registrant Name Entity Registrant Name Third Party Third Party [Member] Third Party Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation and amortization Depreciation and Amortization Depreciation, Depletion and Amortization Earnings (Loss) Segment operating results Gross Profit Total Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Deferred Deferred State and Local Income Tax Expense (Benefit) Fair Value as of Grant Date Award Grant Date Fair Value Customer Concentration Risk Customer Concentration Risk [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Geographical [Domain] Geographical [Domain] Market-Based, Cash-Settled Awards Market-Based, Cash-Settled Awards [Member] Market-Based, Cash-Settled Awards Principles of Consolidation Consolidation, Policy [Policy Text Block] Profit Gross Profit from Purchased Water Gross Profit from Purchased Water Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Issued and outstanding shares - 26822768.1904039 at December 31, 2024 and 26,770,545 at December 31, 2023 Common Stock, Value, Issued Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Interest rate swap Deferred Tax Liabilities, Derivatives Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Performance-Based Cash-Settled Awards Performance-Based Cash-Settled Awards [Member] Performance-Based Cash-Settled Awards Other Deferred Tax Assets, Other Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Land and land improvements Land and Land Improvements [Member] Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Concentration Risk [Line Items] Concentration Risk [Line Items] State income taxes, net of Federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Total deferred income tax liabilities Deferred Tax Liabilities, Gross Net income per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic REAL ESTATE Real Estate Disclosure [Text Block] Amount paid for water contracts Operating Lease, Payments Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Contractual obligation for future water payments Contractual Obligation Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Ownership [Domain] Ownership [Domain] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Current investment mix Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Total current liabilities Liabilities, Current OTHER LIABILITIES Other Liabilities Disclosure [Text Block] Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Distribution of earnings from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Revolving line of credit RLC outstanding balance Bond debt sold by TRPFFA Long-Term Line of Credit New stock grants/additional shares due to achievement in excess of target (in shares) Shares granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Long Lived Assets Held-for-sale, Name [Domain] Long-Lived Assets Held-for-Sale, Name [Domain] Year one Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities Year One at Par Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities Year One at Par Excess joint venture distributions and other Other Sundry Liabilities, Noncurrent INVESTMENT IN UNCONSOLIDATED AND CONSOLIDATED JOINT VENTURES Equity Method Investments and Joint Ventures Disclosure [Text Block] Revenues Revenues Entity Address, City or Town Entity Address, City or Town Borrowings of long-term debt Proceeds from Issuance of Long-Term Debt Total fair value of award Expensed Share-Based Payment Arrangement, Expense Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets, Next Fiscal Year Defined Benefit Plan, Expected Return on Plan Assets, Next Fiscal Year Expired/forfeited grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Assumptions used in determining actuarial present value of projected benefits obligation: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Area of real estate property (in acres) Area of Real Estate Property Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Document Fiscal Year Focus Document Fiscal Year Focus TRC-DP1, LLC TRC-DP1, LLC [Member] TRC-DP1, LLC Tejon Ranch Commerce Center Tejon Ranch Commerce Center [Member] Tejon Ranch Commerce Center [Member] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Accrued liabilities and other Total Other Accrued Liabilities, Current Document Period End Date Document Period End Date Schedule of Assumptions Used to Determine The Price of Market-Based Performance Condition Grants Schedule of Share based Payment Award Equity Instruments Other than Options Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions Accrued paid personal leave Accrued Paid Personal Leave, Current Accrued Paid Personal Leave, Current Schedule of Changes in Benefit Obligations and Plan Assets Schedule of Net Funded Status [Table Text Block] Book deferred gains Deferred Tax Assets, Book Deferred Gains Deferred Tax Assets, Book Deferred Gains Stock grants outstanding beginning of the year at target achievement (in shares) Stock grants outstanding at target achievement (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Real Estate [Abstract] Real Estate [Abstract] Water purchase contracts: Long-term Water Assets, Water Contracts (Volume) Long-term Water Assets, Water Contracts (Volume) Rockefeller Joint Ventures Rockefeller Joint Ventures [Member] Rockefeller joint ventures. Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Document Transition Report Document Transition Report Federal: Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] NDSI Plan Non-Employee Director Stock Incentive Plan [Member] Non-employee director stock incentive plan. Investments in long-term water assets Payments to Acquire Other Investments Name of Major Customer [Domain] Customer [Domain] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Transferable water Long-term Water Assets, Transferrable Water (Volume) Long-term Water Assets, Transferrable Water (Volume) Year two Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities, Year Two, at Par Debt Securities, Available for sale securities maturities, year two, at par. Total water purchase contracts Long-term Water Assets, Intangible Water Contracts (Volume) Long-term Water Assets, Intangible Water Contracts (Volume) Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Amounts recorded in stockholders’ equity Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Contract-based Intangible Assets Contract-Based Intangible Assets [Member] Schedule of Components of Provision (Benefit) for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Company Selected Measure Name Company Selected Measure Name Percentage of rentable space occupied Joint Venture, Percentage of Rentable Space Occupied Joint Venture, Percentage of Rentable Space Occupied