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Quarterly Financial Data (unaudited) - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 03, 2017
Feb. 26, 2016
Sep. 01, 2015
Interim Reporting [Line Items]                            
Gain (loss) on equity method investments $ 0 $ 11,381 $ 0 $ 0         $ 11,381 $ 0 $ 0      
Tax act provisional tax expense (benefit)                 3,343          
Other operating (income) costs, net         $ 0 $ 3,385 $ 0 $ 0 0 $ 3,385 $ 0      
Illinois Corn Processings LLC                            
Interim Reporting [Line Items]                            
Gain (loss) on equity method investments                 $ 11,381          
Equity method ownership percentage                       30.00% 30.00% 30.00%