v3.3.1.900
Related Party Transactions (Details 9)
12 Months Ended
Feb. 09, 2016
USD ($)
Dec. 31, 2014
USD ($)
railcar
Dec. 31, 2016
USD ($)
American Railcar Industries, Inc      
Related Party Transaction [Line Items]      
Number of new railcars purchased | railcar   50  
Purchases from related party   $ 6,700,000  
Expenses from transactions with related parties   50,000  
American Railcar Leasing, LLC      
Related Party Transaction [Line Items]      
Purchases from related party   $ 1,100,000  
Number of used railcars purchased | railcar   12  
CRLLC | Subsequent Event | Credit Facility Guaranty Agreement      
Related Party Transaction [Line Items]      
Face amount of third party debt $ 125,000,000    
CRLLC | Subsequent Event | Credit Facility Guaranty Agreement | Minimum      
Related Party Transaction [Line Items]      
Term of third party debt 1 year    
CRLLC | Subsequent Event | Credit Facility Guaranty Agreement | Maximum      
Related Party Transaction [Line Items]      
Term of debt 2 years    
Forecast | CRLLC | Letter of Credit      
Related Party Transaction [Line Items]      
Borrowing capacity     $ 150,000,000.0