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Concentration Of Credit Risk (Narrative) (Details) ft² in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 a ft² customer property
Real Estate Properties [Line Items] |
Number of properties | 195
Area of real estate property | ft² | 12.5
Number of tenants accounting for more than 10% of rental revenues | customer | 0
Maximum [Member] |
Real Estate Properties [Line Items] |
Revenue percentage from largest customer | 10.00%
Northern New Jersey/New York City [Member] |
Real Estate Properties [Line Items] |
Percentage accounted by properties of its annualized base rent | 26.40%
Los Angeles [Member] |
Real Estate Properties [Line Items] |
Percentage accounted by properties of its annualized base rent | 19.20%
Office Building [Member] | Northern New Jersey/New York City [Member] |
Real Estate Properties [Line Items] |
Number of properties | 55
Area of real estate property | ft² | 3.1
Office Building [Member] | Los Angeles [Member] |
Real Estate Properties [Line Items] |
Number of properties | 36
Area of real estate property | ft² | 2.7
Land Parcels [Member] | Northern New Jersey/New York City [Member] |
Real Estate Properties [Line Items] |
Number of properties | 5
Area of real estate property | a | 26.8
Land Parcels [Member] | Los Angeles [Member] |
Real Estate Properties [Line Items] |
Number of properties | 3
Area of real estate property | a | 8.0

X
- Definition Number of tenants. + References No definition available. + Details
Name: | trno_NumberOfTenants
Namespace Prefix: | trno_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage accounted by properties of its annualized base rent. + References No definition available. + Details
Name: | trno_PercentageAccountedByPropertiesOfItsAnnualizedBaseRent
Namespace Prefix: | trno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revenue percentage from largest customer. + References No definition available. + Details
Name: | trno_RevenuePercentageFromLargestCustomer
Namespace Prefix: | trno_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=trno_NorthernNewJerseyAndNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=trno_LosAngelesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=trno_LandParcelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |