| Standard label: | Oil and Gas Properties [Text Block] |
| Name: | us-gaap:OilAndGasPropertiesTextBlock |
| Documentation: | The entire disclosure for properties used in normal conduct of oil and gas exploration and producing operations. This disclosure may include property accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives. |
| Object type: | cm:Level1TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OilAndGasPropertiesTextBlock |
| Label | Role | Language |
| Oil and Gas Properties [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 932 360 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |