cm:Member: us-gaap:LeasesAcquiredInPlaceMarketAdjustmentMember
| Leases, Acquired-in-Place, Market Adjustment [Member] |
| us-gaap:LeasesAcquiredInPlaceMarketAdjustmentMember |
| This element represents the identifiable intangible asset or liability established for an assumed above or below-market lease acquired in an acquisition. Such asset or liability is established regardless of whether the acquiree is the lessee or the lessor. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:LeasesAcquiredInPlaceMarketAdjustmentMember |