cm:Concept: us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding
| Weighted Average Limited Partnership Units Outstanding, Basic |
| us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding |
| Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period. |
| cm:Concept |
| Shares (xbrli:sharesItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:WeightedAverageLimitedPartnershipUnitsOutstanding |