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Equity-Based Compensation (CPE Inc. only) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
May 31, 2011
2009 Long Term Incentive Plan
Dec. 31, 2011
2009 Long Term Incentive Plan
Dec. 31, 2011
Restricted Stock
Y
Dec. 31, 2010
Restricted Stock
Dec. 31, 2011
Performance Based Share Units
Dec. 31, 2011
CPE Inc. plans
Dec. 31, 2010
CPE Inc. plans
Dec. 31, 2009
CPE Inc. plans
Dec. 31, 2009
Rio Tinto Plans
Share-based compensation plans                        
Pool of shares of common stock for issuance in connection with share-based awards before additional approval       3,400,000                
Pool of shares of common stock for issuance in connection with share-based awards       5,500,000                
Number of shares available for grant         3,300,000              
Share-based compensation expense $ 8,796,000 $ 7,234,000 $ 3,073,000           $ 8,796,000 $ 7,234,000 $ 785,000 $ 2,288,000
Award vesting period           Third anniversary of the grant date            
Period within which share-based awards vest if employee is terminated without cause after change in control (in years)           2            
Restricted stock and performance based share unit award activity                        
Non-vested shares at the beginning of the period, number (in shares)           878,000 849,000          
Granted, number (in shares)           105,000 69,000 162,000        
Forfeited, number (in shares)           (39,000) (40,000) (3,000)        
Vested, number (in shares)           (8,000)            
Non-vested shares at the end of the period, number (in shares)           936,000 878,000 159,000        
Weighted Average Grant-Date Fair Value (per share)                        
Non-vested shares at the beginning of the period, (in dollars per share)           $ 15.09 $ 15.00          
Granted (in dollars per share)           $ 21.28 $ 16.19 $ 20.12        
Forfeited (in dollars per share)           $ 15.36 $ 15.00 $ 20.12        
Vested (in dollars per share)           $ 18.31 $ 15.15          
Non-vested shares at the end of the period (in dollars per share)           $ 15.75 $ 15.09 $ 20.12        
Performance period (in years)               3 years        
Percentage of target amount, low end of range               0.00%        
Percentage of target amount, high end of range               200.00%        
Unrecognized compensation cost           $ 4,700,000   $ 2,300,000