cm:Concept: us-gaap:ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount
| Continuing Care Retirement Communities, Refund Obligation |
| us-gaap:ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount |
| Amount of refund obligation under existing contract for continuing care retirement community. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount |