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Stock Compensation - Restricted Stock and Performance Share Grants - Performance Share Grants (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost not yet recognized $ 4,878us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 25 months      
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent 1,065us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent 0us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent    
Performance share grants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Below threshold performance 0trc_PerformanceAwardsGrantedWithPerformanceConditionsNumberOfSharesToBeIssuedBelowThresholdPerformance
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Performance share grants | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Threshhold and target performance 79,390trc_GrantedPerformanceUnitsWithStockAwardsRangingShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Performance share grants | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Threshhold and target performance 148,728trc_GrantedPerformanceUnitsWithStockAwardsRangingShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Maximum performance 268,049trc_GrantedPerformanceUnitsWithStockAwardsRangingThresholdPerformance
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Tejon Mountain Village LLC | Performance share grants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   296,389us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= trc_TejonMountainVillageLlcMember
99,207us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= trc_TejonMountainVillageLlcMember
 
Restricted Stock Units (RSUs) | Performance share grants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period       133,890trc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsModificationsinPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockUnitsRSUMember
New Stock Grants/Additional shares due to maximum achievement       89,837us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications, Annual Cost 1,109trc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsModificationsAnnualCost
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications Aggregate Fair Value $ 5,702trc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsModificationsAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockUnitsRSUMember