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 |