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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 loan
Debt Instrument [Line Items] |  |  |
Weighted average fixed annual rate | 2.70%us-gaap_DebtWeightedAverageInterestRate |  |
Capitalized insterest associated with redevelopment activities | $ 0 us-gaap_InterestCostsCapitalized | $ 0.3 us-gaap_InterestCostsCapitalized |
Five-Year $50.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility term loan | 5 years |  |
Credit facility | 50.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanMember |  |
Credit facility maturity date | May 01, 2019 |  |
Seven-Year $50.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility term loan | 7 years |  |
Credit facility | 50.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanBMember |  |
Credit facility maturity date | May 01, 2021 |  |
LIBOR margin | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanBMember |  |
Seven-Year $50.0 Million Term Loan [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
LIBOR margin | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanBMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Seven-Year $50.0 Million Term Loan [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
LIBOR margin | 2.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanBMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Five-Year $100.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility term loan | 5 years |  |
Credit facility | 100.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = trno_SeniorSecuredTermLoanCMember |  |
Credit facility maturity date | Mar. 01, 2020 |  |
Five-Year $50.0 Million Term Loan, Seven-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 200.0 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
Mortgage Loans Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Number of mortgage loans payable | 9 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember |  | 9 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember
Secured loan | 103.6 us-gaap_SecuredDebtCurrent / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember |  | 104.5 us-gaap_SecuredDebtCurrent / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember
Weighted average fixed annual rate | 4.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember |  | 4.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember
Total net investment book value of properties securing the debt | 213.3 trno_InvestmentUnderSecuredDebtBookValueNet / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember |  | 213.4 trno_InvestmentUnderSecuredDebtBookValueNet / us-gaap_LongtermDebtTypeAxis = trno_MortgageLoansPayableMember
Mortgage Loans Payable [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage loans maturity, period | 2015 |  |
Mortgage Loans Payable [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage loans maturity, period | 2021 |  |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 100.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility maturity date | May 01, 2018 |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan, Seven-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum possible increase | $ 500.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
Borrowing base properties percentage | 60.00%trno_BorrowingBasePropertiesPercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
Effective rate | 0.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
LIBOR margin | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan, Seven-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unused facility fee rate | 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan, Seven-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unused facility fee rate | 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanSevenYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
LIBOR margin | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
LIBOR margin | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Revolving Credit Facility [Member] | Five-Year $50.0 Million Term Loan And Five-Year $100.0 Million Term Loan [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
LIBOR margin | 2.05%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = trno_FiveYear50.0MillionTermLoanAndFiveYear100.0MillionTermLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Borrowing Base Properties Percentage + References No definition available. + Details
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- Definition Investment under secured debt book value net. + References No definition available. + Details
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- Definition Mortgage loans maturity period. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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