cm:Concept: us-gaap:SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
| Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest |
| us-gaap:SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest |
| The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. |
| cm:Concept |
| Percent (num:percentItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest |