cm:Concept: us-gaap:IncreaseDecreaseInSelfInsuranceReserve
| Increase (Decrease) in Self Insurance Reserve |
| us-gaap:IncreaseDecreaseInSelfInsuranceReserve |
| The increase (decrease) during the period in the carrying amount of accrued known and estimated losses incurred 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. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:IncreaseDecreaseInSelfInsuranceReserve |