| Standard label: | Investment Owned, Unrestricted, Carrying Value Per Unit at Date of Purchase Price Agreement |
| Name: | us-gaap:InvestmentOwnedUnrestrictedCarryingValuePerUnitAtDateOfPurchasePriceAgreement |
| Documentation: | The carrying value per unit of investment of unrestricted investment of the same issue as the restricted investment during the preceding year at the date the purchase price was agreed. |
| Object type: | cm:Concept |
| Data type: | srt-types:perUnitItemType |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InvestmentOwnedUnrestrictedCarryingValuePerUnitAtDateOfPurchasePriceAgreement |
| Label | Role | Language |
| Investment Owned, Unrestricted, Carrying Value Per Unit at Date of Purchase Price Agreement | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 1 (SX 210.12-12(6)(b)(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 320 S99 4 (SX 210.12-12C(9)(b)(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |