| Standard label: | Hedge Funds, Equity Long (Short) [Member] |
| Name: | us-gaap:HedgeFundsEquityLongShortMember |
| Documentation: | Investments in registered hedge funds that invest both long and short primarily in U.S. common stocks. |
| 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:HedgeFundsEquityLongShortMember |
| Label | Role | Language |
| Hedge Funds, Equity Long (Short) [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |