cm:Concept: us-gaap:BelowMarketLeaseAmortizationIncomeYearFour
| Below Market Lease, Amortization Income, Year Four |
| us-gaap:BelowMarketLeaseAmortizationIncomeYearFour |
| 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 during the fourth fiscal year following the latest fiscal year. Excludes 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:BelowMarketLeaseAmortizationIncomeYearFour |