Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted-average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Acres of land related to land liens Acres of Land Related to Land Liens Acres of land related to land liens. Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Cost Reported Value Measurement [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] 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] Segment Reporting [Abstract] Segment Reporting [Abstract] Common stock, $0.50 par value per share: Authorized shares - 50,000,000 Issued and outstanding shares - 27,004,897 at June 30, 2026 and 26,916,837 at December 31, 2025 Common Stock, Value, Issued Accrued long-term water assets included in current liabilities Accrued Long-term Water Assets Included in Current Liabilities Accrued Long-term Water Assets Included in Current Liabilities Revenue from External Customers by Products and Services [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] December 16, 2023 December 16, 2023 [Member] December 16, 2023 RETIREMENT PLANS Retirement Benefits [Text Block] Restatement Determination Date Restatement Determination Date Investments in unconsolidated joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Non-cash tenant allowance amortization Equity Method Investment, Summarized Financial Information, Tenant Allowance Amortization Equity Method Investment, Summarized Financial Information, Tenant Allowance Amortization Tejon Ranch Commerce Center - Commercial Tejon Ranch Commerce Center - Commercial [Member] Tejon Ranch Commerce Center - Commercial Amendment Flag Amendment Flag Current Liabilities: Liabilities, Current [Abstract] Cost of purchased water (per acre-foot) Cost of Purchased Water, Area Cost of Purchased Water, Area Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Non-cash profits recognized from land contribution 2 Gain (Loss) on Disposition of Other Assets Loss Contingencies [Table] Loss Contingencies [Table] TRC-MRC 3, LLC TRC-MRC 3 LLC [Member] TRC-MRC 3 LLC [Member] Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax [Abstract] Property and equipment expenditures Payments to Acquire Other Property, Plant, and Equipment RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Excess tax provision (benefit) from stock-based compensation Excess Tax (Expense) Benefit From Stock-Based Compensation Excess Tax (Expense) Benefit From Stock-Based Compensation Stock grants outstanding beginning of the year at target achievement (in shares) Stock grants outstanding end of period 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 Common stock (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] 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 Benefits [Abstract] Retirement Benefits [Abstract] Amortization of discount of marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Receivables, inventories, prepaids and other assets, net Increase (Decrease) in Operating Assets Transferable water Transferable Water [Member] Transferable water. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current 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. Total water held for future use Long-term Water Assets, Banked Water and Water Contract Rights (Volume) Long-term Water Assets, Banked Water and Water Contract Rights (Volume) Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Simulated fair value per share (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 Entity Address, City or Town Entity Address, City or Town New stock grants/additional shares (in shares) Shares granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Deficit balance Distributions in Excess of Investment in Unconsolidated Joint Venture Distributions in Excess of Investment in Unconsolidated Joint Venture Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Balance Sheet Information Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Additional reimbursement funds Additional Reimbursement Funds Additional reimbursement funds. Net cost of purchased water contracts Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Distribution of equity from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital East CFD East Community Facilities Districts [Member] -- None. No documentation exists for this element. -- Accumulated Depreciation Intangible Asset, Finite-Lived, Accumulated Amortization Level 2 Fair Value, Inputs, Level 2 [Member] Other income: Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of credit facility Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive loss Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Name of Property [Axis] Name of Property [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Restricted stock issuance (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Capitalized Share-Based Payment Arrangement, Amount Capitalized March 06, 2025 March 06, 2025 [Member] March 06, 2025 New Accounting Pronouncements Effective in Future Periods New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Segment Information Segment Reporting [Table Text Block] Non-controlling Interest Noncontrolling Interest [Member] Municipal notes Municipal Bonds [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Long-term water assets (in acre-feet) Long-term Water Assets (Volume) Long-term Water Assets (Volume) Schedule of Accrued liabilities and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Reconciling items: Segment Reporting, Reconciliation [Abstract] Other comprehensive loss before taxes Other comprehensive loss before taxes Other Comprehensive Income (Loss), before Tax LONG-TERM WATER ASSETS Property, Plant, and Equipment [Text Block] December 09, 2025 December 09, 2025 [Member] December 09, 2025 Document Period End Date Document Period End Date Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] TRC-MRC 2, LLC TRC-MRC 2 LLC [Member] TRC-MRC 2 LLC [Member] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Additional bond debt authorized to be sold in future Debt instrument face amount Debt Instrument, Face Amount EQUITY Equity [Text Block] Costs and expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name WRMWSD - Contracts with the Company Wheeler Ridge Maricopa Water Storage District Wheeler Ridge Maricopa Water Storage District [Member] Wheeler Ridge Maricopa Water Storage District [Member] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Cost of sales Cost of sales of water Cost of Purchased Water Maximum performance (in shares) Performance Awards Granted with Performance Conditions, Maximum Number of Shares to be Issued, at Maximum Performance Performance Awards Granted with Performance Conditions, Maximum Number of Shares to be Issued, at Maximum Performance Service period Defined Benefit Plan, Average Service Period Defined Benefit Plan, Average Service Period Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Tejon Ranch Commerce Center - Multifamily Tejon Ranch Commerce Center - Multifamily [Member] Tejon Ranch Commerce Center - Multifamily Funds invested in marketable securities Payments to Acquire Marketable Securities Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Reconciliation to amounts on consolidated balance sheets: Cash and Cash Equivalent [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] AVEK Antelope Valley East Kern Water Agency [Member] Antelope valley east kern water agency. 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 Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Schedule of Real Estate Schedule of Real Estate Properties [Table Text Block] Name Outstanding Recovery, Individual Name Equity in Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Maturities and sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Schedule of Weighted Average Number of Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Segment Reporting Information [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Schedule of Other Liabilities Other Liabilities [Table Text Block] Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Accrued capital expenditures included in current liabilities Change In Capital Expenditures Incurred But Not Yet Paid Change In Capital Expenditures Incurred But Not Yet Paid Real estate and improvements - held for lease, gross Inventory, Real Estate, Improvements, Gross Inventory, Real Estate, Improvements, Gross Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Non-cash retirement plan expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Award Date [Axis] Award Date [Axis] Annual fee increase Long Term Water Assets, Purchased, Annual Fee Increase, Percent Long Term Water Assets, Purchased, Annual Fee Increase, Percent Investments in water assets Payments to Acquire Other Investments Consolidated joint venture, ownership interest Subsidiary, Ownership Percentage, Parent Credit Facility [Domain] Credit Facility [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Excess joint venture distributions and other (See Note 14) Other Sundry Liabilities, Noncurrent Revenues Revenue from Purchased Water Revenue from Purchased Water Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Water Contracts (Dudley-Ridge, Nickel and Tulare) Dudley Ridge, Nickel And Tulare Water Contracts [Member] Dudley Ridge, Nickel And Tulare Water Contracts Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Borrowings on line of credit Proceeds from Lines of Credit Award Date [Domain] Award Date [Domain] Payout of target award, low end of range (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] 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) Segment operating income Earnings (Loss) Gross Profit Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Grapevine Grapevine [Member] Grapevine [Member] Accrued interest receivable balance Accrued Investment Income Receivable Amount paid for water contracts Operating Lease, Payments Schedule of Components of Water Assets Long-Lived Asset, Held-for-Sale [Table Text Block] SWP Water Contracts State Water Project Contracts [Member] State water project contracts. Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Dudley-Ridge water purchase contract Dudley Ridge Water Rights [Member] Dudley Ridge Water Rights [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Proceeds from sale of property plant and equipment Proceeds from Sale, Real Estate, Other, Held-for-Investment Effective income tax rate Effective Income Tax Rate Reconciliation, Percent April 21, 2026 April 21, 2026 [Member] April 21, 2026 Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Schedule of Water Contract Payments Other Commitments [Table Text Block] Common stock equivalents (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Additional costs for future years Improvement Funds, Reimbursement Of Public Infrastructure Costs Improvement Funds, Reimbursement Of Public Infrastructure Costs Schedule of Components of Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Depreciation and amortization Depreciation OTHER LIABILITIES Other Liabilities Disclosure [Text Block] Plan Name [Domain] Plan Name [Domain] Vesting [Domain] Vesting [Domain] Scenario [Domain] Scenario [Domain] TRCC-East TRCC-East [Member] TRCC-East [Member] Contract-based Intangible Assets Contract-Based Intangible Assets [Member] U.S. Treasury and agency notes U.S. Treasury and agency notes US Treasury and Government Short-Term Debt Securities [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Petro Travel Plaza Holdings, LLC Petro Travel Plaza Holdings, LLC Petro Travel Holdings Llc Plaza [Member] Petro travel holdings llc plaza. Fair market value of investment securities below their 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. REPORTING SEGMENTS AND RELATED INFORMATION Segment Reporting [Text Block] MARKETABLE SECURITIES Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Minimum Minimum [Member] Revolving line of credit Revolving line-of-credit Long-Term Line of Credit Expiration Date Trading Arrangement Expiration Date June 20, 2025 June 20, 2025 [Member] June 20, 2025 Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total equity Beginning balance, value Ending balance, value Equity (Deficit) Equity, Including Portion Attributable to Noncontrolling Interest 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] Total net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, authorized shares (in shares) Common Stock, Shares Authorized Percentage of vesting of award under share-based payment arrangement Share Based Payment Arrangement Awards Earned Threshold Percentage Share Based Payment Arrangement Awards Earned Threshold Percentage Exercise Price Award Exercise Price Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Segment Reporting [Line Items] Segment Reporting [Line Items] Long Lived Assets Held-for-sale [Line Items] Long-Lived Asset, Held-for-Sale [Line Items] Total water held for future use and purchased water contracts Long Term Water Assets, Contracts with Company Long Term Water Assets, Contracts with Company Total compensation cost not yet recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Ranch operations Ranch Operations Ranch Operations [Member] Ranch Operations [Member] Income (loss) before equity in earnings of unconsolidated joint ventures and income tax expense (benefit) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest WRMWSD WRMWSD Water Contract [Member] WRMWSD Water Contract LINE OF CREDIT AND LONG-TERM DEBT Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Contractual obligation for future water payments Contractual Obligation Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investment in unconsolidated joint ventures Equity Method Investments REAL ESTATE Real Estate Disclosure [Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Total costs and expenses Costs and Expenses Commercial/industrial expenses Total resort/residential expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Total Tejon Ranch Co. stockholders’ equity Equity, Attributable to Parent Total other income, net Nonoperating Income (Expense) ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Five West Parcel Llc Five West Parcel Llc [Member] Five west parcel llc. Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Insider Trading Policies and Procedures [Line Items] ACCRUED LIABILITIES AND OTHER CURRENT LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Schedule of Stock Grant Activity Schedule of Nonvested Share Activity [Table Text Block] Taxes on vested stock grants Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] 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] Performance share grants Performance Shares Performance Shares [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Selling, general and administrative expenses Selling, General and Administrative Expense Deferred income taxes Deferred Income Tax Expense (Benefit) TRC-MRC 1, LLC TRC-MRC 1 LLC [Member] TRC-MRC 1 LLC [Member] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Real estate - resort/residential Resort and Residential Real Estate [Member] Resort and Residential Real Estate [Member] Supplemental executive retirement plan liability (See Note 12) Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Restricted stock excluded from the calculation of dilutive net income per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key DMB DMB Pacific LLC [Member] DMB Pacific LLC [Member] (Cost)/earnings components: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Name of Property [Domain] Name of Property [Domain] Corporate expenses Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] 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] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Number of directors Number of Directors Number of Directors Direct farming expenses Direct Operating Costs Nickel Nickel Water Contract [Member] Nickel Water Contract Schedule of Long Lived Assets Held-for-sale [Table] Long-Lived Asset, Held-for-Sale [Table] Statement of Operations Income Statement [Abstract] Tejon Ranch Co. stockholders’ equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Current liabilities Increase (Decrease) in Operating Liabilities Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Other Other Employee-related Liabilities, Current Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Mountain Village Tejon Mountain Village Llc [Member] Tejon mountain village llc. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Intangible Asset, Finite-Lived Intangible Asset, Finite-Lived [Table Text Block] Term SOFR Debt Instrument, Basis Spread on Variable Rate Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Restricted Stock Restricted Stock [Member] 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] All Individuals All Individuals [Member] SUBSEQUENT EVENT Subsequent Events [Text Block] Executive Vice President and Chief Operating Officer Management [Member] Name Forgone Recovery, Individual Name 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 Real estate - commercial/industrial Commercial and Industrial Commercial and Industrial [Member] Commercial and industrial. Total compensation cost not yet recognized, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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] Statement [Line Items] Statement [Line Items] TOTAL ASSETS Identifiable assets Assets Assets TRC-MRC 4, LLC TRC-MRC 4 LLC [Member] TRC-MRC 4 LLC Entity [Domain] Entity [Domain] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] March 17, 2026 March 17, 2026 [Member] March 17, 2026 Investment income Investment Income, Net Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Operating Segments Operating Segments [Member] Current investment mix Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Gross unrealized holding gain (loss) Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax PEO PEO [Member] Corporate notes Corporate notes Corporate Note Securities [Member] Total fair value of award Employee and director - expensed Share-Based Payment Arrangement, Expense Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Measurement Basis [Axis] Measurement Basis [Axis] Other liabilities Total Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Real estate and improvements - held for lease, net Real estate and improvements - held for lease, net Inventory, Real Estate, Improvements Majestic Realty Co. Majestic Realty Co. [Member] Majestic Realty Co. [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Retained Earnings Retained Earnings [Member] Operating expenses Operating Expenses Commercial/industrial revenues and equity in earnings of unconsolidated joint ventures Revenues and Income (Loss) from Equity Method Investments Revenues and Income (Loss) from Equity Method Investments Money Market Funds Money Market Funds [Member] Revolving Credit Facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Employee 1998 Plan Stock Incentive Plan 1998 [Member] Stock incentive plan. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, outstanding shares (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] 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 [Table Text Block] Net income (loss) per share attributable to common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status 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] Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for taxes and tax benefit of vested shares Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Real estate development expenditures Payments to Acquire Real Estate Area of building owned and leased Lease of Building Lease of building. Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Recharged water Long-term Water Assets, Recharged Project Water (Volume) Long-term Water Assets, Recharged Project Water (Volume) Ownership [Domain] Ownership [Domain] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Number of tenants Joint Venture, Number Of Tenants Joint Venture, Number Of Tenants Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenues Commercial/industrial revenues Ranch operations revenues Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Long-term acres of land to joint venture Long-Term Acres of Land to Joint Venture At Fair Market Value Long-Term Acres of Land to Joint Venture At Fair Market Value Revenues Segment Reporting, Revenue [Abstract] Interest cost Defined Benefit Plan, Interest Cost Treasury/Corporate Notes Defined Benefit Plan, Debt Security [Member] Investment in unconsolidated joint ventures Payments to Acquire Interest in Joint Venture Financial Instruments [Domain] Financial Instruments [Domain] Consulting agreement term Related Party Transaction, Term Related Party Transaction, Term Threshold performance (in shares) Performance Awards Granted with Performance Conditions, Minimum Number of Shares to be Issued, at Threshold Performance Performance Awards Granted with Performance Conditions, Minimum Number of Shares to be Issued, at Threshold Performance Number of acres for development Development of Building Development of building. Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive loss attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest TCWD TCWD Water Contract [Member] TCWD Water Contract Fair Value Estimate of Fair Value Measurement [Member] Real estate development (includes $$130,824 at June 30, 2026 and $128,549 at December 31, 2025, attributable to CFL (Note 14)) Real estate development Inventory, Real Estate, Land and Land Development Costs Unrealized loss on available-for-sale securities Decline in market value OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] TRC-MRC 5, LLC TRC-MRC 5 LLC [Member] TRC-MRC 5 LLC Fixed water obligations Fixed Water Obligations Fixed Water Obligations 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. Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income (loss) Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Operating income (loss) from farming before fixed water obligations Operating Results From Farming Before Fixed Water Obligations Operating Results From Farming Before Fixed Water Obligations Related Party Transaction [Domain] Related Party Transaction [Domain] 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Current investment policy targets: Defined Benefit Plan, Plan Assets, Allocations [Abstract] Schedule of Maturities, at Par, of Marketable Securities by Year Investments Classified by Contractual Maturity Date [Table Text Block] Farming Farming and Agriculture [Member] Farming and agriculture. 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Net investment in water assets Net investments in water assets Long Term Assets Held for Future Use or Sale Long term assets held for future use or sale. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Long-term deferred gains Contract with Customer, Liability, Noncurrent Equity method investment Equity Equity Method Investment Summarized Financial Information, Investment Equity Method Investment Summarized Financial Information, Investment Total Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities at Par Debt Securities, Available for sale securities maturities, at par. Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name March 13, 2024 March 13, 2024 [Member] March 13, 2024 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 Less accumulated depreciation Inventory, Real Estate, Improvements, Accumulated Depreciation Inventory, Real Estate, Improvements, Accumulated Depreciation Income (loss) before income tax expense (benefit) Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 11) Commitments and Contingencies Revenues Revenues Target share price to achieve award (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Price at Target Achievement Share-based Compensation Arrangement by Share-based Payment Award, Price at Target Achievement Costs Intangible Asset, Finite-Lived, before Accumulated Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Percentage of building leased Percentage Of Building Leased Percentage Of Building Leased Equity in earnings of unconsolidated joint ventures, net Equity in earnings of unconsolidated joint ventures, net Equity in earnings of unconsolidated joint ventures Income (Loss) from Equity Method Investments Acre-Feet Sold Long Term Water Assets, Water Sold (Volume) Long Term Water Assets, Water Sold (Volume) Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] 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. 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Contract Rights [Abstract] Tejon-Castac Water District Tejon-Castac Water District [Member] Tejon-Castac Water District [Member] PEO Name PEO Name Restricted cash (included in prepaid expenses and other current assets) Restricted cash Restricted Cash Contribution of land to unconsolidated joint venture Contribution of Property Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number TRCC/Rock Outlet Center LLC TRCC/Rock Outlet Center LLC [Member] TRCC/Rock Outlet Center [Member] Legal Entity [Axis] Legal Entity [Axis] December 11, 2024 December 11, 2024 [Member] December 11, 2024 Other Commitments [Line Items] Other Commitments [Line Items] Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Extension option term Debt Instrument, Extension Option, Term Debt Instrument, Extension Option, Term Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] 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) Accrued liabilities and other Accrued liabilities and other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 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 Contract renewal optional term Long Term Water Assets, Contract Renewal Optional Term Long Term Water Assets, Contract Renewal Optional Term Long-term Water Assets [Line Items] Long-term 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Land Water contracts and related costs, consulting services Related Party Transaction, Amounts of Transaction Gain on sale of property plant and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Investment, Name [Domain] Investment, Name [Domain] Net income (loss) per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Deferred income Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Cost of sales of land Cost of sales Cost of Revenue Real estate development expenditures Payments to Develop Real Estate Assets Award Type [Axis] Award Type [Axis] Profit Gross Profit from Purchased Water Gross Profit from Purchased Water Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable Accounts Receivable, 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[Member] TRPFFA Plan Name [Axis] Plan Name [Axis] Number of extension options Debt Instrument, Number Of Extension Options Debt Instrument, Number Of Extension Options Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Schedule of Stock Compensation Costs for Employee and NDSI Plans Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other loss, net Other Nonoperating Income (Expense) Total Stockholders' Equity Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Expired/forfeited grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period 2026 Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities Year One at Par Debt Securities, Available for sale securities maturities, year one, at par. Assumptions used in determining periodic pension cost: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Information pretaining to assets of the business segments Segment Reporting, Other Disclosure [Abstract] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Accrued bonus Accrued Bonuses, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Nickel water purchase contract Nickel Water Rights [Member] Nickel Water Rights [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Segment Operating Income (loss) Segment Reporting, Income (Loss) before Income Tax [Abstract] Debt Debt Equity Method Investment Summarized Financial Information, Borrowings Equity Method Investment Summarized Financial Information, Borrowings Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name INCOME TAXES Income Tax Disclosure [Text Block] Trade accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recognized profit Gain (Loss) on Sale of Other Investments Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Long term deferred profit on land contribution Deferred Gain On Contribution Of Land Deferred Gain On Contribution Of Land Entity Filer Category Entity Filer Category TRC-DP1, LLC TRC-DP1, LLC [Member] TRC-DP1, LLC Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Relative Total Shareholder Return Relative Total Shareholder Return [Member] Relative Total Shareholder Return Company Selected Measure Amount Company Selected Measure Amount Accrued paid personal leave Accrued Paid Personal Leave, Current Accrued Paid Personal Leave, Current Schedule of Reconciliation of Revenues, Segment Profits (Losses) and Net Income (Loss) Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Distribution of earnings from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Income taxes receivable Income Taxes Receivable Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation and amortization - Multifamily Depreciation, Depletion and Amortization Consulting Services Consulting Services [Member] Consulting Services Entity Address, Address Line Two Entity Address, Address Line Two Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other capitalized development costs Other Capitalized Development Costs Other Capitalized Development Costs Real Estate [Abstract] Real Estate [Abstract] Accrued vacation Accrued Vacation, Current Current Assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Purchased water contracts Purchased water contracts Long-term Water Assets, Water Contracts (Volume) Long-term Water Assets, Water Contracts (Volume) Entity Address, Address Line One Entity Address, Address Line One Income tax expense (benefit) Income Tax Expense (Benefit) Rockefeller Joint Ventures Rockefeller Joint Ventures [Member] Rockefeller joint ventures. Award Timing Method Award Timing Method [Text Block] Non-Employee Director Stock Incentive Plan Non-Employee Director Stock Incentive Plan [Member] Non-employee director stock incentive plan. 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Statement [Table] Statement [Table] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Certificates of deposit Certificates of Deposit [Member] Total purchased water contracts Long-term Water Assets, Intangible Water Contracts (Volume) Long-term Water Assets, Intangible Water Contracts (Volume) Restricted stock issuance Stock Issued During Period, Value, Restricted Stock Award, Gross Revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Percentage of rentable space Joint Venture, Percentage of Rentable Space Occupied Joint Venture, Percentage of Rentable Space Occupied Number of joint venture contracts Number of Joint Venture Contracts Number of joint venture contracts.