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Description of Operations and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Well Partnership Trust	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Number of wells under non-operating interests	400
Number of limited partnerships | Partnership	18
Number of business income trusts | Trust	2
Valuation allowance | $	$ 0	$ 0
Maximum maturity period of cash and cash equivalents	90 days
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation period of equipment	5 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Number of wells operating by the company	1,500
Depreciation period of equipment	10 years

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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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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-Name Regulation S-K (SK)
-Number 229
-Section 1208
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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