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Description of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 Well Partnership Trust | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of wells under non-operating interests | 800 |  |
Number of limited partnerships | Partnership | 1 |  |
Number of business income trusts | Trust | 1 |  |
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 | 760 |  |
Depreciation period of equipment | 5 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation period of equipment | 10 years |  |

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