cm:Concept: us-gaap:WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic
| Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic |
| us-gaap:WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic |
| Weighted average number of limited partnership and general partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership and general partnership units have been outstanding to the total time in that period. Includes, for example, the number of units distributed to unit holders whereby unit holders have the ability to elect to receive the unit holders' entire distribution in cash or units of equivalent value or there is a potential limitation on the total amount of cash that all unit holders can elect to receive in aggregate. |
| cm:Concept |
| Shares (xbrli:sharesItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic |