cm:Level3TextBlock: us-gaap:ScheduleOfSubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipDescriptionTextBlock
| Schedule of Subsidiary of Limited Liability Company or Limited Partnership, Description [Table Text Block] |
| us-gaap:ScheduleOfSubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipDescriptionTextBlock |
| Tabular disclosure of the key aspects of a subsidiary (partnership, corporation, or other entity) of the limited liability company or limited partnership. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfSubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipDescriptionTextBlock |