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Description of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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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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- Definition 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 -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns a fractional working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition 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. + References No definition available. + Details
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