| Standard label: | Indefinite-Lived Franchise Rights |
| Name: | us-gaap:IndefiniteLivedFranchiseRights |
| Documentation: | Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:IndefiniteLivedFranchiseRights |
| Label | Role | Language |
| Indefinite-Lived Franchise Rights | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 350 30 50 2 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 350 |
| Part Of Roll Up: |
| us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill |