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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 operating activities Net Cash Provided by (Used in) Operating Activities Schedule of Other Liabilities Other Liabilities [Table Text Block] Schedule 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 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] Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 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 Fair value per share at grant date (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value at Grant Date Share-based Compensation Arrangement by Share-based Payment Award, Fair Value at Grant Date 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] (Cost)/earnings 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] 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 Payments to acquire interest in joint venture Payments to Acquire Interest in Joint Venture 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 Equity in Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Equity Method Investment Summarized Financial Information, Equity In Earnings (Loss) Special taxes paid Taxes, Other OTHER LIABILITIES Other Liabilities Disclosure [Text Block] Term Notes Medium-term Notes [Member] Financial Instrument [Axis] Financial Instrument [Axis] 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 Performance share grants Performance Shares [Member] Interest Rate Swap Interest Rate Swap [Member] Current maturities of long-term debt 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] Profit margin Earnings (Loss) Gross Profit 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] 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] Investment, Name [Axis] Investment, Name [Axis] Pension Plan Pension Plan [Member] 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 16, 2021 [Member] December 16, 2021 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 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 Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Revenues 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] 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 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 (loss) 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 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] Statement [Table] Statement [Table] Document Quarterly Report Document Quarterly Report Current Assets: Assets, Current [Abstract] 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 (loss) 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] 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 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. 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Mineral resources Mineral Resources [Member] Mineral Resources [Member] Local Phone Number Local Phone Number Operating income 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 provided 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] 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 Unrealized gain (loss) on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 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] 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] December 14, 2022 December 14, 2022 [Member] December 14, 2022 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 - 26,710,432 at March 31, 2023 and 26,541,553 at December 31, 2022 Common Stock, Value, Issued Cost Reported Value Measurement [Member] Real estate development (includes $116,071 at March 31, 2023 and $115,221 at December 31, 2022, attributable to Centennial Founders, LLC, Note 15) Real estate development Inventory, Real Estate, Land and Land Development Costs Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Area of building owned and leased Lease of Building Lease of building. 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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 Amount paid for water contracts Operating Lease, Payments 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 Promissory Note Notes Payable, Other Payables [Member] 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] Income taxes payable Income tax payables Accrued Income Taxes, Current 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 Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] 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 Restricted Cash West CFD West Community Facilities Districts [Member] West community facilities districts. 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Marketable Securities, with unrealized losses for less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss REPORTING SEGMENTS AND RELATED INFORMATION Segment Reporting Disclosure [Text Block] Amortization of (discount) premium of marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Marketable Securities with unrealized losses for more than 12 months Debt Securities, Available-for-Sale, Continuous 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] Loss (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 Schedule 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] 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 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 Employee plan and NDSI plan - expensed Share-Based Payment Arrangement, Expense 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 Profit Gross Profit from Purchased Water Gross Profit from Purchased Water Cover [Abstract] Cover [Abstract] Income 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] Schedule 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] Long-term Debt, Type [Axis] Long-Term Debt, Type [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 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 income per share attributable to common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Non-cash retirement plan expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) 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 2023 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] 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 (benefit) taxes related to other comprehensive income items Other Comprehensive Income (Loss), Tax 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 Debt Debt Equity Method Investment Summarized Financial Information, Borrowings Equity Method Investment Summarized Financial Information, Borrowings 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] 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] Schedule of Stock Grant Activity Schedule of Nonvested Share Activity [Table Text Block] Weighted Average Interest Pay Rate Derivative, Fixed Interest Rate 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 Increase 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 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] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] 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 Transferable water 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] 2024 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 Income (Loss) from Equity Method Investments Real estate and equipment expenditures Payments to Acquire Property, Plant, and Equipment BASIS OF PRESENTATION Business Description and Basis of Presentation [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.