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Description of Operations and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 Trust Well Partnership
Property, Plant and Equipment [Line Items]
Number of wells operating by the company	1,600
Minimum number of wells under non-operating interests	800
Number of limited partnerships	18
Number of business income trusts	2
Maximum 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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Maximum Maturities Period Of Cash And Cash Equivalents

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Number of business income trusts.

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Number of limited partnerships.

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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.

+ References

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

-Publisher SEC

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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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