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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Securities transaction gain recognized |  |  | $ 12.6 | $ 0.1
Sale of investment in Amalgamated Sugar Company LLC |  |  | 250.0 |
Deemed repayment of snake river sugar company indebtedness |  |  | 250.0 |
Snake River |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Securities transaction gain recognized | $ 12.5 | $ 12.5 | $ 12.5 |
Sale of investment in Amalgamated Sugar Company LLC | $ 250.0 |  |  |
Deemed repayment of snake river sugar company indebtedness |  | $ 250.0 |  |

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