| Standard label: | Investments in and Advances to Affiliates, at Fair Value |
| Name: | us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValue |
| Documentation: | Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. |
| 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:InvestmentsInAndAdvancesToAffiliatesAtFairValue |
| Label | Role | Language |
| Investments in and Advances to Affiliates, at Fair Value | http://www.xbrl.org/2003/role/label | en-US |
| Investments in and Advances to Affiliates, at Fair Value, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Investments in and Advances to Affiliates, at Fair Value, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(2)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(3)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(Column E)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |