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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: