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Concentration of Credit Risk (Details) ft² in Millions	Sep. 30, 2019 a ft² property
Northern New Jersey/New York City
Real Estate Properties [Line Items]
Percentage accounted by properties of its annualized base rent	29.50%
Los Angeles
Real Estate Properties [Line Items]
Percentage accounted by properties of its annualized base rent	16.20%
Office building | Northern New Jersey/New York City
Real Estate Properties [Line Items]
Number of properties	61
Area of real estate property | ft²	3.5
Office building | Los Angeles
Real Estate Properties [Line Items]
Number of properties	42
Area of real estate property | ft²	2.5
Land parcels | Northern New Jersey/New York City
Real Estate Properties [Line Items]
Number of properties	9
Area of real estate property | a	48.7
Land parcels | Los Angeles
Real Estate Properties [Line Items]
Number of properties	5
Area of real estate property | a	10.1

X

- Definition

Percentage accounted by properties of its annualized base rent.

+ References

No definition available.

+ Details

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Namespace Prefix:	trno_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Details

Name:	srt_StatementGeographicalAxis=trno_NorthernNewJerseyAndNewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=trno_LosAngelesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=trno_LandParcelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: