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Commitments And Contingencies (Narrative) (Details) (USD $)	0 Months Ended
	May 06, 2015 contract sqft property	Mar. 31, 2015 sqft property	Dec. 31, 2014
Other Commitments [Line Items]
Number of properties		137us-gaap_NumberOfRealEstateProperties
Area of real estate property		10,400,000us-gaap_AreaOfRealEstateProperty
Net book value		$ 1,000,068,000us-gaap_RealEstateInvestmentPropertyNet	$ 855,827,000us-gaap_RealEstateInvestmentPropertyNet
Outstanding Contract With Third Party [Member]
Other Commitments [Line Items]
Outstanding contracts with a third-party sellers	3trno_NumberOfRealEstateContract / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember
Number of properties	3us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember
Area of real estate property	438,774us-gaap_AreaOfRealEstateProperty / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember
Non-binding Letter Of Intent [Member]
Other Commitments [Line Items]
Number of properties	1us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_NonBindingLetterOfIntentMember
Area of real estate property	58,564us-gaap_AreaOfRealEstateProperty / us-gaap_OtherCommitmentsAxis = trno_NonBindingLetterOfIntentMember
Number of non-binding letters of intent	1trno_NumberOfNonBindingLettersOfIntent / us-gaap_OtherCommitmentsAxis = trno_NonBindingLetterOfIntentMember
Total aggregate initial investment	6,800,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_OtherCommitmentsAxis = trno_NonBindingLetterOfIntentMember
Washington DC, Baltimore And San Francisco Bay Area [Member]
Other Commitments [Line Items]
Sales 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
Washington DC, Baltimore And San Francisco Bay Area [Member] | Outstanding Contract With Third Party [Member]
Other Commitments [Line Items]
Outstanding contracts with a third-party sellers	2trno_NumberOfRealEstateContract / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Number of properties	2us-gaap_NumberOfRealEstateProperties / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Area of real estate property	225,427us-gaap_AreaOfRealEstateProperty / us-gaap_OtherCommitmentsAxis = trno_OutstandingContractWithThirdPartyMember / us-gaap_StatementGeographicalAxis = trno_WashingtonDcBaltimoreAndSanFranciscoBayAreaMember
Sales 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

Number of non-binding letters of intent.

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- Definition

Number of real estate contract.

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- Definition

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- Definition

Area of a real estate property.

+ References

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

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

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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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