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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2010
Goldman Sachs Funds and Kelso Funds
Mar. 31, 2012
Affiliate of GS
Apr. 30, 2011
Affiliate of GS
CRLLC
CRNF credit facility
Mar. 31, 2012
GS, Kelso and the president, chief executive officer and chairman of the board of CVR
Mar. 31, 2011
GS, Kelso and the president, chief executive officer and chairman of the board of CVR
Related Party Transactions          
Percentage of outstanding shares beneficially owned 40.00%        
Financing and Other          
Underwriter fees   $ 5.7      
Additional third party fees and expenses associated with the offering     2.0    
Expenses related to Registration Rights Agreement       $ 0 $ 0.3