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Held For Sale Assets (Narrative) (Details) (USD $)
Feb. 11, 2015
property
Dec. 31, 2014
property
Dec. 31, 2013
Held For Sale Assets [Line Items]      
Number of properties 11us-gaap_NumberOfRealEstateProperties 126us-gaap_NumberOfRealEstateProperties  
Net book value   $ 855,827,000us-gaap_RealEstateInvestmentPropertyNet $ 624,736,000us-gaap_RealEstateInvestmentPropertyNet
Washington DC and Baltimore [Member]      
Held For Sale Assets [Line Items]      
Number of properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementGeographicalAxis
= trno_WashingtonDcAndBaltimoreMember		 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementGeographicalAxis
= trno_WashingtonDcAndBaltimoreMember		  
Sales price of property held for sale   11,200,000trno_SellingPriceOfPropertyHeldForSale
/ us-gaap_StatementGeographicalAxis
= trno_WashingtonDcAndBaltimoreMember		  
Net book value   $ 6,300,000us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_StatementGeographicalAxis
= trno_WashingtonDcAndBaltimoreMember