cm:Member: us-gaap:MajorityOwnedSubsidiaryUnconsolidatedMember
| Majority-Owned Subsidiary, Unconsolidated [Member] |
| us-gaap:MajorityOwnedSubsidiaryUnconsolidatedMember |
| Company in which the parent entity has a financial interest through direct or indirect ownership of more than 50 percent of the voting interest in an entity but does not have control and therefore does not consolidate. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:MajorityOwnedSubsidiaryUnconsolidatedMember |