cm:Concept: us-gaap:SelfInsuranceReserveCurrent
| Self Insurance Reserve, Current |
| us-gaap:SelfInsuranceReserveCurrent |
| Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer). |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:SelfInsuranceReserveCurrent |