| Standard label: | Schedule of Impaired Intangible Assets [Table Text Block] |
| Name: | us-gaap:ScheduleOfImpairedIntangibleAssetsTextBlock |
| Documentation: | Tabular disclosure of impaired intangible assets excluding goodwill. This may include a description of the facts and circumstances leading to the recording of impairment charges of intangible assets in the period, the amount of the impairment charges, the methods of determining fair value of the associated assets, the caption in the income statement in which the impairment losses are aggregated, and the segment in which the impaired intangible assets are reported. |
| 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:ScheduleOfImpairedIntangibleAssetsTextBlock |
| Examples of this text block disclosure: | ImpairedIntangibleAssets |
| Label | Role | Language |
| Schedule of Impaired Intangible Assets [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 350 30 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 350 |