cm:Level3TextBlock: us-gaap:ScheduleOfFreshStartAdjustmentsTextBlock
| Schedule of Fresh-Start Adjustments [Table Text Block] |
| us-gaap:ScheduleOfFreshStartAdjustmentsTextBlock |
| Tabular disclosure of description and amounts of adjustments to historical balance sheet to arrive at fresh-start amounts following bankruptcy and reorganization with a different owner. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfFreshStartAdjustmentsTextBlock |
| FreshStartAdjustments |