cm:Concept: us-gaap:AmortizationOfAcquisitionCosts
       
          
          | Amortization of Acquisition Costs | 
       
       
          
          | us-gaap:AmortizationOfAcquisitionCosts | 
       
       
          
          | The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:AmortizationOfAcquisitionCosts |