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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Revenue from External Customer [Line Items]    
Number of reportable segments 4us-gaap_NumberOfReportableSegments  
Segment revenues $ 16,633us-gaap_Revenues $ 14,535us-gaap_Revenues
Equity in earnings of unconsolidated joint ventures, net 1,150us-gaap_IncomeLossFromEquityMethodInvestments 438us-gaap_IncomeLossFromEquityMethodInvestments
Real estate - commercial/industrial    
Revenue from External Customer [Line Items]    
Segment revenues 3,362us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
2,942us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Equity in earnings of unconsolidated joint ventures, net 1,150us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
459us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Revenues and Income (Loss) from Equity Method Investments 4,512trc_RevenuesandIncomeLossfromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
3,401trc_RevenuesandIncomeLossfromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Real estate - commercial/industrial | Commercial leases    
Revenue from External Customer [Line Items]    
Segment revenues 2,145us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_CommercialLeasesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
1,863us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_CommercialLeasesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Real estate - commercial/industrial | Grazing leases    
Revenue from External Customer [Line Items]    
Segment revenues 387us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_GrazingLeasesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
368us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_GrazingLeasesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Real estate - commercial/industrial | All other land management ancillary services    
Revenue from External Customer [Line Items]    
Segment revenues 830us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherLandManagementAncillaryServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
711us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherLandManagementAncillaryServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_CommercialAndIndustrialMember
Real estate - resort/residential    
Revenue from External Customer [Line Items]    
Segment revenues 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
93us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
Equity in earnings of unconsolidated joint ventures, net 0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
(21)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
Revenues and Income (Loss) from Equity Method Investments 0trc_RevenuesandIncomeLossfromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
72trc_RevenuesandIncomeLossfromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
Real estate - resort/residential | Management fees    
Revenue from External Customer [Line Items]    
Segment revenues 0us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_ManagementFeesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
90us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_ManagementFeesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
Real estate - resort/residential | Other    
Revenue from External Customer [Line Items]    
Segment revenues 0us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherResortandResidentialRealEstateAncillaryServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
3us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherResortandResidentialRealEstateAncillaryServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_ResortandResidentialRealEstateMember
Mineral resources    
Revenue from External Customer [Line Items]    
Segment revenues 10,200us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
9,654us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Mineral resources | Oil and Gas    
Revenue from External Customer [Line Items]    
Segment revenues 776us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OilAndGasMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
1,740us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OilAndGasMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Mineral resources | Water Sales    
Revenue from External Customer [Line Items]    
Segment revenues 8,993us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_WaterSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
7,390us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_WaterSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Mineral resources | Rock Aggregate    
Revenue from External Customer [Line Items]    
Segment revenues 102us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_RockAggregateMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
263us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_RockAggregateMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Mineral resources | Cement    
Revenue from External Customer [Line Items]    
Segment revenues 242us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_CementMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
205us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_CementMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Mineral resources | Land Lease for Oil Exploration    
Revenue from External Customer [Line Items]    
Segment revenues 87us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_LandLeaseForOilExplorationMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
56us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_LandLeaseForOilExplorationMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_MineralResourcesMember
Farming Segment    
Revenue from External Customer [Line Items]    
Segment revenues 3,071us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
1,846us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Total crop proceeds    
Revenue from External Customer [Line Items]    
Segment revenues 3,058us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= sic_Z0100
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
1,846us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= sic_Z0100
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Almonds    
Revenue from External Customer [Line Items]    
Segment revenues 2,716us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_AlmondsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
1,276us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_AlmondsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Pistachios    
Revenue from External Customer [Line Items]    
Segment revenues 249us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_PistachiosMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
308us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_PistachiosMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Wine Grapes    
Revenue from External Customer [Line Items]    
Segment revenues 0us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_WineGrapesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
0us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_WineGrapesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Hay    
Revenue from External Customer [Line Items]    
Segment revenues 93us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_HayMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
262us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_HayMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
Farming Segment | Other Farming Revenues    
Revenue from External Customer [Line Items]    
Segment revenues $ 13us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherFarmingRevenuesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember
$ 0us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= trc_OtherFarmingRevenuesMember
/ us-gaap_StatementBusinessSegmentsAxis
= trc_FarmingSegmentMember