| Standard label: | Impairment of Oil and Gas Properties |
| Name: | us-gaap:ImpairmentOfOilAndGasProperties |
| Documentation: | The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ImpairmentOfOilAndGasProperties |
| Label | Role | Language |
| Impairment of Oil and Gas Properties | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 360 10 50 2 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 360 |
| FASB Accounting Standards Codification 932 360 35 11 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |
| Part Of Roll Up: |
| us-gaap:TangibleAssetImpairmentCharges |