Long Term Water Assets (Details Textual) (USD $)	6 Months Ended
Jun. 30, 2012 acre	Dec. 31, 2011
Long Term Water Assets (Textual) [Abstract]
Long term assets held for sale, in acre feet	10,534
Transferable water [Member]
Long Term Water Assets (Textual) [Abstract]
Long term assets held for sale, additional area in acre feet	14,786
SWP Contracts [Member]
Long Term Water Assets (Textual) [Abstract]
Long term assets held for sale, in acre feet	3,444
Annual amortization (Year1)	$ 708,000
Annual amortization (Year2)	708,000
Annual amortization (Year3)	708,000
Annual amortization (Year4)	708,000
Annual amortization (Year5)	708,000
Accumulated amortization	1,673,000	1,317,000
Kern County [Member]
Long Term Water Assets (Textual) [Abstract]
Long term assets held for sale, in acre feet	8,700
Antelope Valley East Kern Water Agency [Member]
Long Term Water Assets (Textual) [Abstract]
Long term assets held for sale additional purchase	8,985,000
Long term assets held for sale, additional area in acre feet	2,362
Wheeler Ridge Maricopa Water Storage District and Tejon-Castac Water District [Member]
Long Term Water Assets (Textual) [Abstract]
Amortization expense	$ 0

Long-lived assets held-for-sale accumulated amortization.

No definition available.

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

- Definition

Long-lived assets held-for-sale additional area

+ References

No definition available.

+ Details

Name:	trc_LongLivedAssetsHeldForSaleAdditionalArea
Namespace Prefix:	trc_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-lived assets held-for-sale amortization expense.

+ References

No definition available.

+ Details

Name:	trc_LongLivedAssetsHeldForSaleAmortizationExpense
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Long-lived assets held-for-sale, area.

+ References

No definition available.

+ Details

Name:	trc_LongLivedAssetsHeldForSaleArea
Namespace Prefix:	trc_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-lived assets held-for-sale, period increase (decrease).

+ References

No definition available.

+ Details

Name:	trc_LongLivedAssetsHeldForSalePeriodIncreaseDecrease
Namespace Prefix:	trc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	trc_LongTermWaterAssetsTextualAbstract
Namespace Prefix:	trc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

+ Details

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

- Definition

Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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