cm:Concept: us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities
       
          
          | Liquidation Basis of Accounting, Accrued Costs to Dispose of Assets and Liabilities | 
       
       
          
          | us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities | 
       
       
          
          | Amount of estimated accrued costs to dispose of assets or other items expected to be sold in liquidation. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Credit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities |