Real Estate (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Real estate development	$ 305,558	$ 297,581
Less accumulated depreciation	(2,754)	(2,761)
Real estate and improvements - held for lease, net	17,841	18,674
Mountain Village
Property, Plant and Equipment [Line Items]
Real estate development	144,721	142,567
Centennial
Property, Plant and Equipment [Line Items]
Real estate development	106,494	104,491
Grapevine
Property, Plant and Equipment [Line Items]
Real estate development	36,081	34,813
Tejon Ranch Commerce Center
Property, Plant and Equipment [Line Items]
Real estate development	18,262	15,710
Tejon Ranch Commerce Center	$ 20,595	$ 21,435

Inventory, Real Estate, Improvements, Accumulated Depreciation

No definition available.

Name:	trc_InventoryRealEstateImprovementsAccumulatedDepreciation
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Inventory, Real Estate, Improvements, Gross

+ References

No definition available.

+ Details

Name:	trc_InventoryRealEstateImprovementsGross
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents improvements to real estate during development for ultimate sale to third parties. Improvements may consist of project infrastructure and other expenditures necessary to completion of the development project which is generally of a long-term nature.

+ References

No definition available.

+ Details

Name:	us-gaap_InventoryRealEstateImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities..

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=trc_TejonMountainVillageLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=trc_CentennialFoundersLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=trc_GrapevineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=trc_TejonRanchCommerceCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: