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Description of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Well Partnership Trust | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |
Number of wells under non-operating interests | 400 |
Number of limited partnerships | Partnership | 6 |
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 | 1,500 |
Depreciation period of equipment | 5 years |
Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation period of equipment | 10 years |

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- Definition 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=84230637&loc=d3e32537-109319 + Details
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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 Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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