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Held For Sale Assets (Narrative) (Details) (USD $)	Mar. 31, 2015 property	Dec. 31, 2014	May 06, 2015
Held For Sale Assets [Line Items]
Number of properties	137us-gaap_NumberOfRealEstateProperties
Net book value	$ 1,000,068,000us-gaap_RealEstateInvestmentPropertyNet	$ 855,827,000us-gaap_RealEstateInvestmentPropertyNet
Washington DC and Baltimore [Member]
Held For Sale Assets [Line Items]
Number of properties	25us-gaap_NumberOfRealEstateProperties / us-gaap_StatementGeographicalAxis = trno_WashingtonDcAndBaltimoreMember
Washington DC, Baltimore And San Francisco Bay Area [Member]
Held For Sale Assets [Line Items]
Selling Price of Property Held for Sale	24,600,000trno_SellingPriceOfPropertyHeldForSale / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Net book value	13,000,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember		13,000,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Outstanding Contract With Third Party [Member]
Held For Sale Assets [Line Items]
Number of properties			3us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember
Outstanding Contract With Third Party [Member] | Washington DC and Baltimore [Member]
Held For Sale Assets [Line Items]
Number of properties	1us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcAndBaltimoreMember
Outstanding Contract With Third Party [Member] | San Francisco Bay Area [Member]
Held For Sale Assets [Line Items]
Number of properties	1us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_SanFranciscoBayAreaMember
Outstanding Contract With Third Party [Member] | Washington DC, Baltimore And San Francisco Bay Area [Member]
Held For Sale Assets [Line Items]
Number of properties			2us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Selling Price of Property Held for Sale			$ 24,600,000trno_SellingPriceOfPropertyHeldForSale / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember

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- Definition

Selling price of property held for sale.

+ References

No definition available.

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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