cm:Level2TextBlock: us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy
       
          
          | Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] | 
       
       
          
          | us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy | 
       
       
          
          | Entity's cash and cash equivalents accounting policy with respect to restricted balances.  Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. | 
       
       
          
          | cm:Level2TextBlock | 
       
       
          
          | Text Block (HTML) (nonnum:textBlockItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy |