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Long-Term Water Assets - Volume of Water Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
aft
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
aft
Sep. 30, 2013
Dec. 31, 2009
aft
Dec. 31, 2008
aft
Long-term Water Assets [Line Items]              
Contract renewal optional term   35 years          
Water sold (Volume) 7,054trc_LongTermWaterAssetsWaterSoldVolume            
Water assets sales price $ 8,993trc_LongTermWaterAssetsSoldSalesPrice $ 7,390trc_LongTermWaterAssetsSoldSalesPrice          
Cost of purchased water $ 5,237us-gaap_CostOfPurchasedWater $ 4,388us-gaap_CostOfPurchasedWater          
Banked water and water for future delivery              
Total purchased water - third parties 49,018trc_LongTermWaterAssetsVolume     49,461trc_LongTermWaterAssetsVolume      
Total purchased and contracted water sources in acre feet 107,858trc_LongTermWaterAssetsContractsWithCompany     109,158trc_LongTermWaterAssetsContractsWithCompany      
Transferable water with AVEK multiple         1.5trc_LongtermWaterAssetsTransferrableWaterFactor    
AVEK              
Banked water and water for future delivery              
AVEK water bank 13,033trc_LongTermWaterAssetsBankedWaterHeldAtAgencyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		     13,033trc_LongTermWaterAssetsBankedWaterHeldAtAgencyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		   6,393trc_LongTermWaterAssetsBankedWaterHeldAtAgencyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		 8,393trc_LongTermWaterAssetsBankedWaterHeldAtAgencyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember
Company water bank 8,700trc_LongTermWaterAssetsBankedWaterHeldAtCompanyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		     8,700trc_LongTermWaterAssetsBankedWaterHeldAtCompanyOwnedWaterBankVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		      
AVEK water for future delivery 2,362trc_LongTermWaterAssetsWaterContractRightsForFutureDeliveryVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		     2,362trc_LongTermWaterAssetsWaterContractRightsForFutureDeliveryVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		      
Banked water and water for future delivery 24,095trc_LongTermWaterAssetsBankedWaterAndWaterContractRightsVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		     24,095trc_LongTermWaterAssetsBankedWaterAndWaterContractRightsVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		      
Transferable water 14,786trc_LongtermWaterAssetsTransferrableWaterVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		 [1]     15,229trc_LongtermWaterAssetsTransferrableWaterVolume
/ us-gaap_CounterpartyNameAxis
= trc_AntelopeValleyEastKernWaterAgencyMember		 [1]      
Affiliated Entity              
Banked water and water for future delivery              
Water contracts and purchased water 10,137trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember		     10,137trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= us-gaap_AffiliatedEntityMember		      
SWP contracts              
Banked water and water for future delivery              
AVEK water for future delivery           3,444trc_LongTermWaterAssetsWaterContractRightsForFutureDeliveryVolume
/ us-gaap_CounterpartyNameAxis
= trc_StateWaterProjectContractsMember		  
Wheeler Ridge Maricopa Water Storage District              
Banked water and water for future delivery              
Water contracts and purchased water 15,547trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= trc_WheelerRidgeMaricopaWaterStorageDistrictMember		     15,547trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= trc_WheelerRidgeMaricopaWaterStorageDistrictMember		      
Tejon-Castac Water District              
Banked water and water for future delivery              
Banked water and water for future delivery 37,544trc_LongTermWaterAssetsBankedWaterAndWaterContractRightsVolume
/ us-gaap_CounterpartyNameAxis
= trc_TejonCastacWaterDistrictMember		     38,401trc_LongTermWaterAssetsBankedWaterAndWaterContractRightsVolume
/ us-gaap_CounterpartyNameAxis
= trc_TejonCastacWaterDistrictMember		      
Water contracts and purchased water 5,749trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= trc_TejonCastacWaterDistrictMember		     5,749trc_LongTermWaterAssetsWaterContractsVolume
/ us-gaap_CounterpartyNameAxis
= trc_TejonCastacWaterDistrictMember		      
Transferable water              
Banked water and water for future delivery              
Total purchased water - third parties         22,179trc_LongTermWaterAssetsVolume
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= trc_TransferableWaterMember		    
Transferable water | DMB              
Banked water and water for future delivery              
Total purchased water - third parties 6,693trc_LongTermWaterAssetsVolume
/ us-gaap_CounterpartyNameAxis
= trc_DMBPacificLLCMember
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= trc_TransferableWaterMember		            
Maximum | DMB              
Long-term Water Assets [Line Items]              
Annual fee increase, percent   3.00%trc_LongTermWaterAssetsPurchasedAnnualFeeIncreasePercent
/ us-gaap_CounterpartyNameAxis
= trc_DMBPacificLLCMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Scenario, Forecast | DMB              
Long-term Water Assets [Line Items]              
Consumer price per acre     675trc_CostofPurchasedWaterArea
/ us-gaap_CounterpartyNameAxis
= trc_DMBPacificLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		        
[1] Any transferable water with AVEK that is used by the Company or returned by AVEK to the Company will be returned at a 1.5 to 1 factor giving the Company use of a total of 22,179 (14,786 x 1.5) acre feet.