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Summary of Significant Accounting Policies - Royalty Income (Details)	12 Months Ended
	Dec. 31, 2012
Royalty Income
Oil and gas royalty average percentage	13.00%

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- Definition

Oil and Gas Royalty Revenue, Average Percentage

+ References

No definition available.

+ Details

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

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- Details

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