cm:Concept: us-gaap:PartnersCapitalAccountReturnOfCapital
| Partners' Capital Account, Return of Capital |
| us-gaap:PartnersCapitalAccountReturnOfCapital |
| Total change in each class of partners' capital accounts during the year due to the return of partner's capital. That is, excess distributions over earnings to partners. All partners include general, limited and preferred partners. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:PartnersCapitalAccountReturnOfCapital |