cm:Concept: us-gaap:BelowMarketLeaseAmortizationIncomeRollingYearTwo
| Below Market Lease, Amortization Income, Rolling Year Two |
| us-gaap:BelowMarketLeaseAmortizationIncomeRollingYearTwo |
| Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:BelowMarketLeaseAmortizationIncomeRollingYearTwo |