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BANK OF AMERICA, NATIONAL ASSOCIATION [Member] Debt Instrument [Axis] Debt Instrument [Axis] Long Lived Assets Held-for-sale, Name [Domain] Long-Lived Assets Held-for-sale, Name [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Interest rate swap settlement Proceeds from Derivative Instrument, Financing Activities REAL ESTATE Real Estate Disclosure [Text Block] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Interest rate on line of credit, variable rate Debt Instrument, Basis Spread on Variable Rate Cost of purchased water (per acre-foot) Cost of Purchased Water, Area Cost of Purchased Water, Area TRCC/Rock Outlet Center, LLC TRCC/Rock Outlet Center [Member] TRCC/Rock Outlet Center [Member] March 11, 2020 March 11, 2020 [Member] March 11, 2020 [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Maturities and sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock TRC-MRC 3, LLC TRC-MRC 3 LLC [Member] TRC-MRC 3 LLC [Member] Total net periodic pension earnings Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Letter of credit renewal period Letter of Credit Renewal Period Letter of credit renewal period. Income Taxes Payable Taxes Payable Property tax payable Accrual for Taxes Other than Income Taxes, Current Decrease in outstanding amount Debt Instrument, Increase (Decrease), Net Equities Defined Benefit Plan, Equity Securities [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) Equity Component [Domain] Equity Component [Domain] Scenario [Axis] Scenario [Axis] Ownership [Axis] Ownership [Axis] Water available for banking, sales, or internal use Transferable Water [Member] Transferable water. Other Liabilities Other Liabilities [Abstract] Investment, Name [Domain] Investment, Name [Domain] 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. 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Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] RLC outstanding balance Bond debt sold by TRPFFA Long-Term Line of Credit Entity Address, State or Province Entity Address, State or Province Level 1 Fair Value, Inputs, Level 1 [Member] Schedule of Weighted Average Number of Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] East CFD East Community Facilities Districts [Member] -- None. No documentation exists for this element. -- Award Type [Axis] Award Type [Axis] Long Lived Assets Held-for-sale by Asset Type [Axis] Long-Lived Assets Held-for-sale by Asset Type [Axis] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Asset balance Derivative Asset Schedule of Other Liabilities Other Liabilities [Table Text Block] Summary of Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] March 18, 2021 March 18, 2021 [Member] March 18 2021 Costs and Expenses: Costs and Expenses [Abstract] Corporate notes Corporate notes Corporate Note Securities [Member] Lender Name [Axis] Lender Name [Axis] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] SERP Supplemental Employee Retirement Plan [Member] Contributions to defined benefit plan Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Treasury/Corporate Notes Defined Benefit Plan, Debt Security [Member] Long-term water assets (in acre-feet) Long-term Water Assets (Volume) Long-term Water Assets (Volume) Legal Entity [Axis] Legal Entity [Axis] Long-term debt, less current portion Long-Term Debt, Excluding Current Maturities Certificates of deposit Certificates of Deposit [Member] Ranchcorp Subsidiaries [Member] Water Water [Member] Profit from water sales Profit from water sales Gain (Loss) on Sale of Other Investments Total liabilities Liabilities Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] TRC-MRC 2, LLC TRC-MRC 2 LLC [Member] TRC-MRC 2 LLC [Member] Water available for banking, sales, or internal use Water Available For Banking, Sales Or Internal Use [Member] Water Available For Banking, Sales Or Internal Use Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 18-19 West, LLC Eighteen Nineteen West Llc [Member] Eighteen nineteen west llc. Revolving Credit Facility Revolving Credit Facility [Member] 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] Marketable securities - available-for-sale Debt Securities, Available-for-Sale, Current Document Type Document Type Debt Debt Borrowings Borrowings 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 Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Earnings (cost) components: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] 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] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Line of credit facility Line of Credit Facility, Increase (Decrease), Net Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Distribution of equity from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital LINE OF CREDIT AND LONG-TERM DEBT Debt Disclosure [Text Block] Segments [Axis] Segments [Axis] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Investment in unconsolidated joint ventures Payments to Acquire Interest in Joint Venture Deferred income taxes Deferred Income Tax Expense (Benefit) Water held for future use 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 Investment in joint venture purchase price increase amount Investment in Joint Venture Purchase Price Increase Amount Investment in Joint Venture Purchase Price Increase Amount Special taxes paid Taxes, Other OTHER LIABILITIES Other Liabilities Disclosure [Text Block] Term Notes Medium-term Notes [Member] Financial Instrument [Axis] Financial Instrument [Axis] Final cash distribution by joint venture Proceeds from Divestiture of Interest in Joint Venture Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date 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 Receivables, inventories, prepaids and other assets, net Increase (Decrease) in Operating Assets Tejon Ranch Commerce Center Inventory, Real Estate, Improvements, Gross Inventory, Real Estate, Improvements, Gross Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] TOTAL ASSETS Assets Assets Debt Disclosure [Abstract] Debt Disclosure [Abstract] Annual fee increase Long Term Water Assets, Purchased, Annual Fee Increase, Percent Long Term Water Assets, Purchased, Annual Fee Increase, Percent Unrealized loss on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Performance share grants Performance Shares [Member] Interest Rate Swap Interest Rate Swap [Member] Number of acres for development Contribution for Joint Venture for Future Development Contribution for joint venture for future development. Less: line-of-credit and current maturities of long-term debt Long-Term Debt, Current Maturities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Revenues Revenue from Purchased Water Revenue from Purchased Water Accounting Policies [Abstract] Accounting Policies [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Tejon Ranch Co. Stockholders’ Equity Stockholders' Equity Attributable to Parent [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Segments [Domain] Segments [Domain] Interest cost Defined Benefit Plan, Interest Cost Estimated tax of change in value of available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax 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) Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Related Party Transaction [Line Items] Related Party Transaction [Line Items] Award Type [Domain] Award Type [Domain] Total compensation cost not yet recognized, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restricted stock issuance Stock Issued During Period, Value, Restricted Stock Award, Gross Grapevine Grapevine [Member] Grapevine [Member] Investments in water assets Payments to Acquire Other Investments Derivative Contract [Domain] Derivative Contract [Domain] Earnings (Loss) Gross Profit Industrial Land Industrial Land [Member] Industrial Land SWP Water Contracts State Water Project Contracts [Member] State water project contracts. Entity Registrant Name Entity Registrant Name Dudley-Ridge water rights Dudley Ridge Water Rights [Member] Dudley Ridge Water Rights [Member] 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] Entity Address, City or Town Entity Address, City or Town RETIREMENT PLANS Retirement Benefits [Text Block] Total equity Beginning balance, value Ending balance, value Equity (Deficit) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Balance Sheet Information Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company PEF Pastoria Energy Facility, LLC [Member] Pastoria Energy Facility, LLC [Member] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share TRCC-East TRCC-East [Member] TRCC-East [Member] Less: deferred loan costs Annual cost related to the letter of credit Debt Issuance Costs, Net Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Pension Plan Pension Plan [Member] Investment, Name [Axis] Investment, Name [Axis] Trading Symbol Trading Symbol Entity File Number Entity File Number Other Liabilities Other Liabilities [Member] Petro Travel Plaza Holdings, LLC Petro Travel Plaza Holdings, LLC Petro Travel Holdings Llc Plaza [Member] Petro travel holdings llc plaza. December 16, 2021 December 162021 [Member] December 162021 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. Long-term deferred gains Contract with Customer, Liability, Noncurrent Comprehensive (loss) income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 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 Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Area of land sold Area of Real Estate Property Sold Area of Real Estate Property Sold Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Revenues Revenues MARKETABLE SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investment income Investment Income, Net INCOME TAXES Income Tax Disclosure [Text Block] Non-cash profits recognized from land contribution Gain (Loss) on Disposition of Other Assets Credit Facility [Domain] Credit Facility [Domain] Total water held for future use and purchased water contracts Long Term Water Assets, Contracts with Company Long Term Water Assets, Contracts with Company Net (loss) income per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Ranch operations Ranch Operations [Member] Ranch Operations [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Unrealized gain on interest rate swap Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Corporate expenses Corporate, Non-Segment [Member] Counterparty Name [Domain] Counterparty Name [Domain] Total Tejon Ranch Co. Stockholders’ Equity Stockholders' Equity Attributable to Parent INTEREST RATE SWAP Derivative Instruments and Hedging Activities Disclosure [Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Ownership [Domain] Ownership [Domain] Entity Interactive Data Current Entity Interactive Data Current Accumulated Depreciation Finite-Lived Intangible Assets, Accumulated Amortization Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Money Market Funds Money Market Funds [Member] Total Stock Compensation Costs Share-Based Payment Arrangement, Accelerated Cost Award Date [Domain] Award Date [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Retained Earnings Retained Earnings [Member] Five West Parcel, LLC Five West Parcel Llc [Member] Five west parcel llc. Common Stock Common Stock [Member] Number of reportable segments Number of Reportable Segments Summary 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] Statement [Table] Statement [Table] Document Quarterly Report Document Quarterly Report Current Assets: Assets, Current [Abstract] Schedule Of Equity Method Investment Equity Method Investee Name Axis [Axis] Schedule Of Equity Method Investment Equity Method Investee Name Axis [Axis] Schedule Of Equity Method Investment Equity Method Investee Name Axis TRC-MRC 1, LLC TRC-MRC 1 LLC [Member] TRC-MRC 1 LLC [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Real estate - resort/residential Resort and Residential Real Estate [Member] Resort and Residential Real Estate [Member] Other comprehensive gain before taxes Other Comprehensive Income (Loss), before Tax Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Related Party Transaction [Axis] Related Party Transaction [Axis] DMB DMB Pacific LLC [Member] DMB Pacific LLC [Member] Retained earnings Retained Earnings (Accumulated Deficit) Current liabilities Increase (Decrease) in Operating Liabilities Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Funds invested in marketable securities Payments to Acquire Marketable Securities Equity Components [Axis] Equity Components [Axis] Scenario [Domain] Scenario [Domain] Proceeds from sale of real estate/assets Proceeds from Sale of Other Real Estate Held-for-investment Number of directors Number of Directors Number of Directors RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Mountain Village Tejon Mountain Village Llc [Member] Tejon mountain village llc. Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] Stock Grants Outstanding Beginning of Period at Target Achievement (in shares) Stock Grants Outstanding End of Period at Target Achievement (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Long Lived Assets Held-for-sale [Line Items] Long-Lived Assets Held-for-sale [Line Items] Total other income Nonoperating Income (Expense) Variable Rate [Domain] Variable Rate [Domain] Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long-Lived Assets Held-for-sale [Table] Costs Finite-Lived Intangible Assets, Gross Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Profit from land sales Profit related to water purchased in prior periods Profit Related To Sale Of Long-Term Water Assets Purchased In Prior Periods Profit Related To Sale Of Long-Term Water Assets Purchased In Prior Periods Other Other Employee-related Liabilities, Current Loss Contingencies [Table] Loss Contingencies [Table] Total water held for future use at cost Total cost water held for future use Tangible Water Assets, Banked Water and Water Contract Rights Tangible Water Assets, Banked Water and Water Contract Rights Gross unrealized holding losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Equity method investment, deferred gain on sale Equity Method Investment, Deferred Gain on Sale Incentive fee on contract termination, 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 [Member] Commercial and industrial. Document Transition Report Document Transition Report Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] 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 [Member] Mineral Resources [Member] Local Phone Number Local Phone Number Operating income (loss) Operating results Operating Income (Loss) TRC-MRC 4, LLC TRC-MRC 4 LLC [Member] TRC-MRC 4 LLC Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Excess joint venture distributions and other Other Sundry Liabilities, Noncurrent Current investment policy targets: Defined Benefit Plan, Plan Assets, Allocations [Abstract] Common stock, outstanding shares (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Investments in unconsolidated joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Notes payable Notes Payable Name of Property [Domain] Name of Property [Domain] Adjustments to reconcile net income to net cash used by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Income tax expense Income Tax Expense (Benefit) 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] Deferred tax liability Deferred Income Tax Liabilities, Net Statement of Operations Income Statement [Abstract] Additional Paid-In Capital Additional Paid-in Capital [Member] Excess tax shortfall from stock-based compensation Deferred Tax Expense from Stock Options Exercised Letter of credit period Letter of credit period Letter of credit period. Balance Sheet Location [Domain] Balance Sheet Location [Domain] Document Fiscal Period Focus Document Fiscal Period Focus Diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Majestic Realty Co. Majestic Realty Co. [Member] Majestic Realty Co. [Member] Fair Value Derivative Assets (Liabilities), at Fair Value, Net 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 Loss Contingencies [Line Items] Loss Contingencies [Line Items] 1998 Plan Stock Incentive Plan 1998 [Member] Stock incentive plan. Contract-based Intangible Assets Contract-Based Intangible Assets [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Summary 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] 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] Issued and outstanding shares - 26,491,770 at September 30, 2022 and 26,400,921 at December 31, 2021 Common Stock, Value, Issued Cost Reported Value Measurement [Member] Real estate development (includes $114,284 at September 30, 2022 and $112,063 at December 31, 2021, attributable to Centennial Founders, LLC, Note 15) Real estate development Inventory, Real Estate, Land and Land Development Costs 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 Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Area of building owned and leased Lease of Building Lease of building. 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Deferred income Contract with Customer, Liability, Current Total Stockholders' Equity Parent [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Amendment Flag Amendment Flag Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Debt instrument face amount Additional bond debt authorized to be sold in future Debt Instrument, Face Amount Other comprehensive income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Construction loan Construction Loan Marketable Securities, with unrealized gains Gross unrealized holding gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Entity Current Reporting Status Entity Current Reporting Status 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. Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Other assets Other Assets, Noncurrent Depreciation and amortization Depreciation, Depletion and Amortization Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Non-cash tenant allowance amortization Equity Method Investment, Summarized Financial Information, Amortization Of Tenant Allowances Equity Method Investment, Summarized Financial Information, Amortization Of Tenant Allowances Counterparty Name [Axis] Counterparty Name [Axis] Farming Farming and Agriculture [Member] Farming and agriculture. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Schedule of Interest Rate Derivatives Schedule of Interest Rate Derivatives [Table Text Block] Schedule of Tangible Water Assets Tangible Water Assets [Table Text Block] Tangible Water Assets [Table Text Block] Property and equipment, net Property, Plant and Equipment, Net Repayments of long-term debt Repayments of Long-Term Debt Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expired/Forfeited Grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Long-term debt Long-Term Debt Other income, net Other Nonoperating Income (Expense) Acres of land Related Party Transaction, Area of Land Related Party Transaction, Area of Land Balance Sheet Location [Axis] Balance Sheet Location [Axis] Common stock, authorized shares (in shares) Common Stock, Shares Authorized Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Maximum Maximum [Member] Schedule of Components of Segment Revenues Revenue from External Customers by Products and Services [Table Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Schedule of Real Estate Schedule of Real Estate Properties [Table Text Block] 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 Tulare Lake Basin water rights Tulare Lake Basin Water Rights [Member] Tulare Lake Basin Water Rights [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Total current assets Assets, Current Centennial Centennial Founders LLC [Member] Centennial Founders LLC Entity Small Business Entity Small Business Measurement Basis [Axis] Measurement Basis [Axis] EQUITY Stockholders' Equity Note Disclosure [Text Block] Schedule of Components of Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Revenues: Revenues [Abstract] Net cost of purchased water contracts Finite-Lived Intangible Assets, Net Line of Credit Facility [Table] Line of Credit Facility [Table] Restricted cash (Shown in Other Assets) Restricted Cash West CFD West Community Facilities Districts [Member] West community facilities districts. 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. Total compensation cost not yet recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Number of hearings Loss Contingency, Number Of Hearings Loss Contingency, Number Of Hearings LONG-TERM WATER ASSETS Property, Plant and Equipment Disclosure [Text Block] Current investment mix Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Total Debt Securities, Available for Sale Securities, Excluding Accrued Interest, Maturities at Par Debt Securities, Available for sale securities maturities, at par. 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Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Water held for future use Long-term Water Assets, Banked Water and Water Contract Rights [Abstract] Long-term Water Assets, Banked Water and Water Contract Rights [Abstract] Tejon-Castac Water District Tejon-Castac Water District [Member] Tejon-Castac Water District [Member] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Additional costs for future years Additional Reimbursement Funds, Costs Reserved For Future Years Additional Reimbursement Funds, Costs Reserved For Future Years Weighted average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Real estate and improvements - held for lease, net Real estate and improvements - held for lease, net Inventory, Real Estate, Improvements Total Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Gain on sale of property plant and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Inventories Inventory, Net Trade accounts payable Accounts Payable, Current 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 Summary of Maturities, at Par, of Marketable Securities by Year Investments Classified by Contractual Maturity Date [Table Text Block] Entity Filer Category Entity Filer Category 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) Common stock (in shares) Weighted Average Number of Shares Outstanding, Basic Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Construction loan 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 Water Assets [Line Items] Long-term Water Assets [Line Items] New Term Note New Term Note [Member] New Term Note Unconsolidated joint ventures, ownership interest Equity Method Investment, Ownership Percentage Total fair value of award Stock compensation costs, expensed Share-Based Payment Arrangement, Expense Third Party Third Party [Member] Third Party Commitments and contingencies Commitments and Contingencies Annual option payment Long Term Water Assets, Purchased, Annual Option Payment, Percent Long Term Water Assets, Purchased, Annual Option Payment, Percent Security Exchange Name Security Exchange Name Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Notional Amount Derivative, Notional Amount Letters of credit outstanding amount Letters of Credit Outstanding, Amount Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Schedule of Components of Long-term Debt Schedule of Debt [Table Text Block] Total revenues Commercial/industrial revenues Revenue from Contract with Customer, Excluding Assessed Tax Current maturities of long-term debt Debt, Current Profit Gross Profit from Purchased Water Gross Profit from Purchased Water Cover [Abstract] Cover [Abstract] Income (loss) from operations before equity in earnings of unconsolidated joint ventures Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Number of community facility districts Number of Community Facility Districts Number of Community Facility Districts Schedule of Components of Water Assets Disclosure of Long-Lived Assets Held-for-sale [Table Text Block] Summary of Stock Compensation Costs for Employee and NDSI Plans Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Noncontrolling Interest Noncontrolling Interest [Member] Contractual obligation for future water payments Contractual Obligation Forecast Forecast [Member] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Award Date [Axis] Award Date [Axis] Net amortization and deferral Defined Benefit Plan, Amortization of Gain (Loss) TOTAL LIABILITIES AND EQUITY Liabilities and Equity Related Party [Axis] Related Party [Axis] Operating results from commercial/industrial and unconsolidated joint ventures Operating Income (Loss), Including Equity In Earnings Of Unconsolidated Joint Ventures Operating Income (Loss), Including Equity In Earnings Of Unconsolidated Joint Ventures Accrued vacation Accrued Vacation, Current Land Land [Member] Common stock equivalents (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Termination fees Liabilities Subject to Compromise, Early Contract Termination Fees Level 2 Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date ACCRUED LIABILITIES AND OTHER Accounts Payable and Accrued Liabilities Disclosure [Text Block] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Net (loss) income per share attributable to common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Non-cash retirement plan expense (benefit) Pension and Other Postretirement Benefits Cost (Reversal of Cost) Contribution to unconsolidated joint venture Value of property contributed Contribution of Property Consolidated joint venture, ownership interest Noncontrolling Interest, Ownership Percentage by Parent Stock compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Proceeds from water sales Proceeds from sale of other investments Proceeds from Sale of Other Investments Total current liabilities Liabilities, Current Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2022 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. U.S. Treasury and agency notes U.S. Treasury and agency notes US Treasury and Government Short-Term Debt Securities [Member] Deferred revenues attributable to a performance obligation Revenue, Remaining Performance Obligation, Amount Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Other Income: Nonoperating Income (Expense) [Abstract] Entity Address, Address Line One Entity Address, Address Line One Expense for income taxes related to other comprehensive income items Other Comprehensive Income (Loss), Tax Purchased water contracts Related Party Transaction, Long-term Water Assets, Water Contracts (Volume) Related Party Transaction, Long-term Water Assets, Water Contracts (Volume) Nickel water rights Nickel Water Rights [Member] Nickel Water Rights [Member] Taxes on vested stock grants Proceeds from (Payments for) Other Financing Activities Capitalized Share-Based Payment Arrangement, Amount Capitalized Product and Service [Axis] Product and Service [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Pension and supplemental executive retirement plan liability Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Credit Facility [Axis] Credit Facility [Axis] Decline in market value OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Retirement Plan Type [Axis] Retirement Plan Type [Axis] Water contracts and related costs Related Party Transaction, Amounts of Transaction Schedule of Accrued Liabilities and Other Schedule of Accrued Liabilities [Table Text Block] Major Multinational Corporation Major Multinational Corporation [Member] Major Multinational Corporation Vested Grants(in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Long term deferred profit on land contribution Deferred Gain On Contribution Of Land Deferred Gain On Contribution Of Land Summary of Stock Grant Activity Schedule of Nonvested Share Activity [Table Text Block] Interest rate swap Weighted Average Interest Pay Rate Derivative, Fixed Interest Rate December 12, 2019 December 12, 2019 [Member] December 12, 2019 [Member] Tejon Ranch Commerce Center Tejon Ranch Commerce Center [Member] Tejon Ranch Commerce Center [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Shares withheld for taxes and tax benefit of vested shares (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Accrued paid personal leave Accrued Paid Personal Leave, Current Accrued Paid Personal Leave, Current Decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Accrued interest receivable balance Accrued Investment Income Receivable Assumptions used in determining periodic pension cost: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Entity Central Index Key Entity Central Index Key Real Estate [Abstract] Real Estate [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Name of Property [Axis] Name of Property [Axis] Shares withheld for taxes and tax benefit of vested shares Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Purchased water contracts Long-term Water Assets, Water Contracts (Volume) Long-term Water Assets, Water Contracts (Volume) Water assets, volume available for purchase from 2017-2030 (up to) (in acre-feet) Long-term Water Assets (Volume), Amount After Year One Long-term Water Assets (Volume), Amount After Year One Accrued liabilities and other Accrued liabilities and other Other Accrued Liabilities, Current Entity [Domain] Entity [Domain] Rockefeller Joint Ventures Rockefeller Joint Ventures [Member] Rockefeller joint ventures. City Area Code City Area Code ASSETS Assets [Abstract] TRCC West TRCC West [Member] TRCC West Retirement Benefits [Abstract] Retirement Benefits [Abstract] NDSI Plan Non-Employee Director Stock Incentive Plan [Member] Non-employee director stock incentive plan. Net proceeds from land sales Proceeds from Sale of Land Held-for-investment Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Number of multi-family rental units Number Of Multi-Family Rental Units Number Of Multi-Family Rental Units Water available for banking, sales, or internal use Long-term Water Assets, Transferrable Water (Volume) Long-term Water Assets, Transferrable Water (Volume) Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] 2023 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. Reconciliation to amounts on consolidated balance sheets: Cash and Cash Equivalents, at Carrying Value [Abstract] Stock compensation expense Share-Based Payment Arrangement, Noncash Expense December 11, 2020 December 11, 2020 [Member] December 11, 2020 Variable Rate [Axis] Variable Rate [Axis] Other liabilities Total Other Liabilities, Noncurrent Total purchased water contracts Long-term Water Assets, Intangible Water Contracts (Volume) Long-term Water Assets, Intangible Water Contracts (Volume) INVESTMENT IN UNCONSOLIDATED AND CONSOLIDATED JOINT VENTURES Equity Method Investments and Joint Ventures Disclosure [Text Block] Equity in earnings of unconsolidated joint ventures, net Equity in earnings of unconsolidated joint ventures, net Equity in Earnings (Loss) Income (Loss) from Equity Method Investments Real estate and equipment expenditures Payments to Acquire Property, Plant, and Equipment Amount expected to be paid Purchase Commitment, Remaining Minimum Amount Committed Proceeds from the sale of land Proceeds from Sale of Real Estate BASIS OF PRESENTATION Business Description and Basis of Presentation [Text Block] Number of joint venture contracts Number of Joint Venture Contracts Number of joint venture contracts. Interest rate swap liability Derivative Liability, Noncurrent