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Quarterly Financial Data (unaudited) - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interim Reporting [Line Items] |  |  |  |  |  |  |
Gain (loss) on equity method investments | $ 0 | $ 11,381 | $ 0 | $ 0 | $ 0 | $ 11,381 | $ 0
Tax act provisional tax expense (benefit) |  |  |  |  | $ 3,343 |  |
Illinois Corn Processings LLC |  |  |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |  |  |
Gain (loss) on equity method investments |  |  |  |  |  | $ 11,381 |

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