cm:Member: us-gaap:UndistributedIncomeFromOtherThanGainOrLossOnSaleOfPropertiesMember
| Undistributed Income from Other than Gain (Loss) on Sale of Properties [Member] |
| us-gaap:UndistributedIncomeFromOtherThanGainOrLossOnSaleOfPropertiesMember |
| This element represents the balance as of the reporting date of undistributed income derived from other than the gain (loss) on sale of properties which is otherwise disclosed. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:UndistributedIncomeFromOtherThanGainOrLossOnSaleOfPropertiesMember |