cm:Concept: us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired
| Payments to Acquire Partners Interest in Real Estate Partnership, Net of Cash Acquired |
| us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired |
| The cash outflow from the purchase of ownership in a partnership, the purpose of which is to construct, sell, hold or invest in real estate. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired |