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Derivative Financial Instruments (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended
May 08, 2014
Dec. 31, 2014
Dec. 31, 2013
Seven-Year $50.0 Million Term Loan [Member]      
Derivative [Line Items]      
Credit facility $ 50,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= trno_SeniorSecuredTermLoanBMember
   
Credit facility term loan 7 years    
LIBOR margin   1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= trno_SeniorSecuredTermLoanBMember
 
Maximum [Member]      
Derivative [Line Items]      
LIBOR margin   2.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum [Member] | Seven-Year $50.0 Million Term Loan [Member]      
Derivative [Line Items]      
LIBOR margin   2.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= trno_SeniorSecuredTermLoanBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Minimum [Member]      
Derivative [Line Items]      
LIBOR margin   1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum [Member] | Seven-Year $50.0 Million Term Loan [Member]      
Derivative [Line Items]      
LIBOR margin   1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= trno_SeniorSecuredTermLoanBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Interest Rate Cap [Member]      
Derivative [Line Items]      
Derivative Asset, Notional Amount   50,000,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
  
Derivative, Cap Interest Rate   4.00%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
 
Derivative, Inception Date   Oct. 31, 2014  
Derivative, Maturity Date   May 01, 2021