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Share-Based Compensation - Long-Term Incentive Plan, CVR Partners (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liability for unvested restricted share awards $ 55,900,000 $ 45,700,000  
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock authorized for issuance (in shares) 5,000,000    
Shares available for issuance (in shares) 4,820,215    
Vesting period 3 years    
Number of shares considered for determining cash payment for each award upon vesting (in shares) 1    
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.33%    
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.33%    
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.33%    
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Phantom Unit and Common Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 3,300,000    
Weighted-average period for amortization of unrecognized compensation cost 1 year 8 months    
Compensation expense $ 1,100,000 1,800,000 $ 1,300,000
Cash paid to settle liability-classified awards upon vesting 1,400,000 2,100,000 $ 800,000
CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0 0  
Liability for unvested restricted share awards 0    
Personnel Accruals | CVR Partners, LP | CVR Partners' Long-Term Incentive Plan | Phantom Unit and Common Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liability for unvested restricted share awards $ 700,000 $ 1,000,000