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Investments In Real Estate (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite Lived Intangible Assets [Line Items]
Recorded revenues	$ 23,131,000us-gaap_RealEstateRevenueNet	$ 15,804,000us-gaap_RealEstateRevenueNet
2015 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Number of buildings	11trno_NumberOfRealEstateBuildingsAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Area of real estate property	1,196,322trno_AreaOfRealEstatePropertyAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Total aggregate initial investment	154,100,000us-gaap_BusinessCombinationConsiderationTransferred1 / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Land	80,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Buildings and improvements	62,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Intangible assets	11,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Intangible liabilities	2,400,000us-gaap_BelowMarketLeaseAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Recorded revenues	1,800,000us-gaap_RealEstateRevenueNet / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
Recorded net income	100,000us-gaap_NetInvestmentIncome / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFifteenAcquisitionMember
2014 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Number of buildings		3trno_NumberOfRealEstateBuildingsAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Area of real estate property		318,822trno_AreaOfRealEstatePropertyAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Total aggregate initial investment		33,900,000us-gaap_BusinessCombinationConsiderationTransferred1 / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Land		11,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Buildings and improvements		20,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Intangible assets		2,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Intangible liabilities		300,000us-gaap_BelowMarketLeaseAcquired / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Recorded revenues		100,000us-gaap_RealEstateRevenueNet / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Recorded net income		16,000us-gaap_NetInvestmentIncome / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Assumption of mortgage loan, total principal		$ 2,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Fixed interest rate		5.09%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / trno_AcquisitionActivityByTypeAxis = trno_TwoThousandFourteenAcquisitionMember
Maturity date		Aug. 01, 2015

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