Description of Operations and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
Dec. 31, 2019 USD ($) Well Partnership Trust	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Number of wells under non-operating interests	800
Number of limited partnerships \| Partnership	3
Number of business income trusts \| Trust	2
Valuation allowance \| $	$ 0	$ 0
Maximum maturity period of cash and cash equivalents	90 days
Minimum [Member]
Property, Plant and Equipment [Line Items]
Number of wells operating by the company	1,400
Depreciation period of equipment	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation period of equipment	10 years

Maximum Maturities Period Of Cash And Cash Equivalents

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Number of business income trusts.

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Number of producing oil wells and oil wells capable of production with working interest ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
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-Section 1208
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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.

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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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