| Standard label: | Goodwill, Impaired, Accumulated Impairment Loss |
| Name: | us-gaap:GoodwillImpairedAccumulatedImpairmentLoss |
| Documentation: | Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GoodwillImpairedAccumulatedImpairmentLoss |
| Label | Role | Language |
| Goodwill, Impaired, Accumulated Impairment Loss | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 350 20 50 1 (a) | http://www.xbrl.org/2003/role/disclosureRef | 350 |
| FASB Accounting Standards Codification 350 20 50 1 (h) | http://www.xbrl.org/2003/role/disclosureRef | 350 |
| Part Of Roll Up: |
| us-gaap:Goodwill |