cm:Concept: us-gaap:DeferredCostsLeasingAccumulatedAmortization
| Deferred Costs, Leasing, Accumulated Amortization |
| us-gaap:DeferredCostsLeasingAccumulatedAmortization |
| For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:DeferredCostsLeasingAccumulatedAmortization |