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Related Party Transactions - Railcar Lease Agreements and Maintenance (Details) - Railcar Lease Agreement - CVR Partners, LP - American Railcar Leasing LLC
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
USD ($)
Jun. 30, 2016
railcar
Dec. 31, 2016
railcar
Related Party Transaction [Line Items]      
Number of railcars to be leased | railcar   115  
Term of lease agreement   7 years  
Number of railcars leased | railcar     115
Rent expense | $ $ 0.2    
Cost of Goods Sold, Maintenance Costs | $ $ 0.2