cm:Member: us-gaap:MeasurementInputDiscountForLackOfMarketabilityMember
| Measurement Input, Discount for Lack of Marketability [Member] |
| us-gaap:MeasurementInputDiscountForLackOfMarketabilityMember |
| Measurement input using amount by which value of business ownership interest is reduced to reflect lack of ability to convert business interest into cash quickly. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:MeasurementInputDiscountForLackOfMarketabilityMember |