Business Segments - Revenue Components of Mineral Resources Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014 well	Mar. 31, 2013
Revenue from External Customer [Line Items]
Segment revenues	$ 7,145	$ 9,760
Decrease in Oil Royalty Revenues	514
Price Per Barrel of Oil Equivalents (BOE)	97	101
New Production Wells	3
Mineral resources
Revenue from External Customer [Line Items]
Decrease in Revenues	602
Decrease in Revenues, Percent	21.00%
Segment revenues	2,264	2,866
Decrease in Production, Percent	21.00%
Decrease in Price Per Barrel, Percent	4.00%
Mineral resources \| Oil and gas
Revenue from External Customer [Line Items]
Segment revenues	1,740	2,254
Mineral resources \| Rock aggregate
Revenue from External Customer [Line Items]
Segment revenues	263	140
Mineral resources \| Cement
Revenue from External Customer [Line Items]
Segment revenues	205	160
Mineral resources \| Land lease for oil exploration
Revenue from External Customer [Line Items]
Segment revenues	$ 56	$ 312

Increase (Decrease) in Oil Royalty Revenues

No definition available.

Name:	tcr_IncreaseDecreaseinOilRoyaltyRevenues
Namespace Prefix:	tcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (Decrease) in Price Per Barrel, Percent

+ References

No definition available.

+ Details

Name:	tcr_IncreaseDecreaseinPricePerBarrelPercent
Namespace Prefix:	tcr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) in Production, Percent

+ References

No definition available.

+ Details

Name:	tcr_IncreaseDecreaseinProductionPercent
Namespace Prefix:	tcr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) in Revenues

+ References

No definition available.

+ Details

Name:	tcr_IncreaseDecreaseinRevenues
Namespace Prefix:	tcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (Decrease) in Revenues, Percent

+ References

No definition available.

+ Details

Name:	tcr_IncreaseDecreaseinRevenuesPercent
Namespace Prefix:	tcr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Production costs incurred in lifting the oil and gas to the surface during the reporting period divided by the number of barrels of oil equivalents (BOE) produced. Production (or lifting costs) are costs incurred in lifting the oil and gas to the surface and generally include gathering, treating, primary processing, field storage, property taxes and insurance on proved properties, but do not include depreciation, depletion, accretion, amortization, royalties, income taxes, interest, general and administrative and other expenses.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

+ Details

Name:	us-gaap_AverageProductionCostsPerBarrelOfOilEquivalentsBOE
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 6

-Subparagraph A

+ Details

Name:	us-gaap_DevelopmentWellsDrilledNetProductive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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