cm:Level3TextBlock: us-gaap:SummaryOfIncomeTaxHolidayTextBlock
| Summary of Income Tax Holiday [Table Text Block] |
| us-gaap:SummaryOfIncomeTaxHolidayTextBlock |
| Tabular disclosure of the income tax exemptions and reductions which have been granted by taxing authorities for a specified period, applicable term of the exemptions and reductions, estimated dollar value of tax benefits, and per share benefits. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SummaryOfIncomeTaxHolidayTextBlock |
| IncomeTaxHoliday |