| Standard label: | Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] |
| Name: | us-gaap:ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock |
| Documentation: | Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. |
| Object type: | cm:Level3TextBlock |
| 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:ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock |
| Examples of this text block disclosure: | AcquiredFiniteLivedIntangibleAssetByMajorClass |
| Label | Role | Language |
| Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 350 30 50 1 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 350 |