| Standard label: | Contract-Based Intangible Assets [Member] |
| Name: | us-gaap:ContractBasedIntangibleAssetsMember |
| Documentation: | Right received from contract, including, but not limited to, advertising contract, broadcast rights, franchise agreement, lease agreement, licensing agreement, and use rights. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ContractBasedIntangibleAssetsMember |
| Label | Role | Language |
| Contract-Based Intangible Assets [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 805 20 55 13 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |