| Standard label: | Property, Plant and Equipment, Policy [Policy Text Block] |
| Name: | us-gaap:PropertyPlantAndEquipmentPolicyTextBlock |
| Documentation: | Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. |
| Object type: | cm:Level2TextBlock |
| 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:PropertyPlantAndEquipmentPolicyTextBlock |
| Examples of this text block disclosure: | PropertyPlantAndEquipmentUsefulLives |
| Label | Role | Language |
| Property, Plant and Equipment, Policy [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.13(a)) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 235 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |
| FASB Accounting Standards Codification 360 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 360 |