| Standard label: | Schedule of Equity Method Investments [Table] |
| Name: | us-gaap:ScheduleOfEquityMethodInvestmentsTable |
| Documentation: | Summarization of information required and determined to be disclosed concerning equity method investments in common stock. The summarized information includes: (a) the name of each investee or group of investees for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ScheduleOfEquityMethodInvestmentsTable |
| Label | Role | Language |
| Schedule of Equity Method Investments [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 323 10 50 3 (a)(b) | http://fasb.org/us-gaap/role/ref/legacyRef | 323 |