cm:Concept: us-gaap:MultiemployerPlansInformationNotAvailable
| Multiemployer Plans, Information Not Available |
| us-gaap:MultiemployerPlansInformationNotAvailable |
| Description of what information concerning a multiemployer plan has been omitted and why the information is not available. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:MultiemployerPlansInformationNotAvailable |