cm:Concept: us-gaap:BelowMarketLeaseAmortizationIncomeRollingYearFour
| Below Market Lease, Amortization Income, Rolling Year Four |
| us-gaap:BelowMarketLeaseAmortizationIncomeRollingYearFour |
| 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 fourth 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:BelowMarketLeaseAmortizationIncomeRollingYearFour |