cm:Concept: us-gaap:ImpairedLongLivedAssetsHeldAndUsedIncomeStatementClassification
| Impaired Long-Lived Assets Held and Used, Income Statement Classification |
| us-gaap:ImpairedLongLivedAssetsHeldAndUsedIncomeStatementClassification |
| Caption in the income statement or the statement of activities that includes the impairment loss for the long-lived asset held and used. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ImpairedLongLivedAssetsHeldAndUsedIncomeStatementClassification |