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Description of Operations and Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2012 Trust PartnershipUnit Well
Description of Operations and Significant Accounting Policies (Textual) [Abstract]
Number of limited partnerships	18
Number of business income trusts	2
Number of wells operating by the company	1,600
Minimum number of wells under non-operating interests	800
Minimum maturity period of cash and cash equivalents	90 days
Maximum [Member]
Property Plant And Equipment [Line Items]
Depreciation period of equipment	10 years
Minimum [Member]
Property Plant And Equipment [Line Items]
Depreciation period of equipment	5 years

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Minimum maturity period of cash and cash equivalents.

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The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest.

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The total number of producing oil wells and oil wells capable of production, in which the entity owns a fractional working interest.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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