| Standard label: | Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) |
| Name: | us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) in the investments in and advances to affiliates. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease |
| Label | Role | Language |
| Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14.1(b)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |