| Standard label: | Net Asset Value Per Share |
| Name: | us-gaap:NetAssetValuePerShare |
| Documentation: | Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. |
| Object type: | cm:Concept |
| Data type: | Share (num:perShareItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:NetAssetValuePerShare |
| Label | Role | Language |
| Net Asset Value Per Share | http://www.xbrl.org/2003/role/label | en-US |
| Net Asset Value Per Share, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Net Asset Value Per Share, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 820 10 50 6A | http://fasb.org/us-gaap/role/ref/legacyRef | 820 |
| FASB Accounting Standards Codification 820 10 35 54B | http://fasb.org/us-gaap/role/ref/legacyRef | 820 |
| FASB Accounting Standards Codification 820 10 50 2 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 820 |
| FASB Accounting Standards Codification 820 10 35 59 | http://fasb.org/us-gaap/role/ref/legacyRef | 820 |
| FASB Accounting Standards Codification 946 205 50 7 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 205 50 7 (h) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |