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STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS, Plan Information (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Deferred Compensation Arrangement [Member]
Dec. 31, 2010
Deferred Compensation Arrangement [Member]
Dec. 31, 2009
Deferred Compensation Arrangement [Member]
Dec. 31, 2011
2001 Plan [Member]
Stock Options [Member]
Dec. 31, 2005
2005 Plan [Member]
Dec. 31, 2011
2005 Plan [Member]
Stock Options [Member]
Dec. 31, 2011
2005 Plan [Member]
RSUs [Member]
Dec. 31, 2011
2005 Plan [Member]
PSUs [Member]
STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS [Abstract]                              
Dividends paid (in dollars per share) $ 0.45 $ 0.45 $ 0.45 $ 0.45 $ 1.80 $ 1.56 $ 1.42                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Deferred stock units credited in period (in shares)               10,460 9,317 11,744          
Shares reissued from Treasury Stock (in shares)               12,143 853 10,135          
Authorized shares of CMP common stock (in shares)                       3,240,000      
Vesting period, minimum (in years)                     3Y        
Vesting period, maximum (in years)                     4Y        
Service period (in years)                         4Y 3Y 3Y
Award expiration description         Rights will expire upon the tenth anniversary of the date of the Rights Agreement           expire on the thirtieth day immediately following the eighth anniversary of issuance. The right to grant awards expires in 2015 Unexercised options expire after seven years    
Number of tranches                             3
Terms of award                         Upon vesting, each option can be exercised to purchase one share of the Company's common stock. one share of common stock for each vested RSU  
Performance period of each tranche (in years)                             1Y
Minimum percentage of earnings (in hundredths)                             0.00%
Maximum percentage of earnings (in hundredths)                             150.00%