OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Rental and other property revenues	$ 31,082	$ 31,535
Property operating expenses	(14,455)	(15,889)
Depreciation	(6,446)	(6,303)
Gain on land sales	1,335	445
Segment operating income (loss)	5,188	5,198
Real estate assets	977,985	901,882
Commercial Properties [Member]
Segment Reporting Information [Line Items]
Rental and other property revenues	7,555	8,872
Property operating expenses	(3,749)	(4,683)
Depreciation	(2,293)	(2,257)
Mortgage and loan interest	(1,849)	(1,606)
Interest income
Gain on land sales
Segment operating income (loss)	(336)	326
Capital expenditures	633	1,343
Real estate assets	135,805	148,115
Property Sales
Sales price
Cost of sale
Gain (loss) on sale
Apartments [Member]
Segment Reporting Information [Line Items]
Rental and other property revenues	23,525	22,660
Property operating expenses	(10,582)	(10,745)
Depreciation	(4,149)	(4,046)
Mortgage and loan interest	(5,456)	(6,758)
Interest income
Gain on land sales
Segment operating income (loss)	3,338	1,111
Capital expenditures
Real estate assets	728,525	635,845
Property Sales
Sales price	2,512
Cost of sale	(2,512)
Gain (loss) on sale
Land [Member]
Segment Reporting Information [Line Items]
Rental and other property revenues
Property operating expenses	(30)	(159)
Depreciation
Mortgage and loan interest	(110)	(551)
Interest income
Gain on land sales	1,335	445
Segment operating income (loss)	1,195	(265)
Capital expenditures		399
Real estate assets	113,004	117,922
Property Sales
Sales price	2,984	1,089
Cost of sale	(1,649)	(644)
Gain (loss) on sale	1,335	445
Other [Member]
Segment Reporting Information [Line Items]
Rental and other property revenues	2	3
Property operating expenses	(94)	(302)
Depreciation	(4)
Mortgage and loan interest	(6,678)	(6,275)
Interest income	3,876
Gain on land sales
Segment operating income (loss)	(2,898)	(3,153)
Capital expenditures
Real estate assets	651
Property Sales
Sales price
Cost of sale
Gain (loss) on sale
Total Segments [Member]
Segment Reporting Information [Line Items]
Rental and other property revenues	31,082	31,535
Property operating expenses	(14,455)	(15,889)
Depreciation	(6,446)	(6,303)
Mortgage and loan interest	(14,093)	(15,190)
Interest income	3,876
Gain on land sales	1,335	445
Segment operating income (loss)	1,299	(1,981)
Capital expenditures	633	1,742
Real estate assets	977,985	901,882
Property Sales
Sales price	5,496	1,089
Cost of sale	(4,161)	(644)
Gain (loss) on sale	$ 1,335	$ 445

Refers to capital expenditures as on date

No definition available.

Name:	tci_CapitalExpenditures
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents the amount of gain (loss) on sale of land during the reporting period.

+ References

No definition available.

+ Details

Name:	tci_GainLossOnLandSales
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt including loan charges and prepayment penalities.

+ References

No definition available.

+ Details

Name:	tci_MortgageAndLoanInterestIncludingCharges
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	tci_PropertySalesAbstract
Namespace Prefix:	tci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cost of sales of real estate.

+ References

No definition available.

+ Details

Name:	tci_RealEstateCostOfSales
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The selling of price of real estate.

+ References

No definition available.

+ Details

Name:	tci_RealEstateSalesPrice
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnSaleOfProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income earned from interest bearing assets classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestIncomeOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

The aggregate revenue from real estate operations during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_RealEstateRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tci_CommercialSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tci_ApartmentsSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tci_LandSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tci_SegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: