| Standard label: | Alternative Investment |
| Name: | us-gaap:AlternativeInvestment |
| Documentation: | Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. |
| 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:AlternativeInvestment |
| Label | Role | Language |
| Alternative Investment | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 820 10 35 54B | http://www.xbrl.org/2003/role/disclosureRef | 820 |
| FASB Accounting Standards Codification 820 10 50 6A (a) | http://www.xbrl.org/2003/role/disclosureRef | 820 |
| Part Of Roll Up: |
| us-gaap:InvestmentsFairValueDisclosure |