| Standard label: | Leases of Lessee Disclosure [Text Block] |
| Name: | us-gaap:LeasesOfLesseeDisclosureTextBlock |
| Documentation: | The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. |
| 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:LeasesOfLesseeDisclosureTextBlock |
| Examples of this text block disclosure: | LeasesOfLesseeDisclosure |
| Label | Role | Language |
| Leases of Lessee Disclosure [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 840 | http://fasb.org/us-gaap/role/ref/otherTransitionRef | 840 |