| Standard label: | Other Energy Equipment [Member] |
| Name: | us-gaap:OtherEnergyEquipmentMember |
| Documentation: | Other long lived, depreciable assets used to process natural resources into a marketable finished product. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OtherEnergyEquipmentMember |
| Label | Role | Language |
| Other Energy Equipment [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 360 10 50 1 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 360 |