cm:Concept: us-gaap:RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
| Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures |
| us-gaap:RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures |
| The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures |