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

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- Details
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Namespace Prefix: | trno_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Selling price of property held for sale. + References No definition available. + Details
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Namespace Prefix: | trno_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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 + Details
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