cm:Concept: us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear
| Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year |
| us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear |
| Amount of required minimum rental payments receivable in the remainder of the fiscal year following the latest fiscal year ended for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear |