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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Marketable securities |  |  | $ 4.8 | $ 255.7 |
Securities transaction gain recognized |  |  | 12.4 | 0.1 | $ 0.5
Sale of investment in Amalgamated Sugar Company LLC |  |  | 250.0 |  |
Deemed repayment of snake river sugar company indebtedness |  |  | 250.0 |  |
Amalgamated Sugar Company LLC |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Net of assets transferred to the LLC |  |  |  | 34.0 |
Marketable securities |  |  |  | 250.0 |
Cost of the investment in LLC |  |  |  | $ 250.0 |
Percentage of share from profit of LLC |  |  |  | 95.00% |
Amalgamated Sugar Company LLC | Base Level |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Distributions from LLC - aggregate annual base level |  |  |  | $ 26.7 |
Snake River |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Loan issued by Snake River |  |  |  | $ 250.0 |
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 |  |  |
Snake River | Amalgamated Sugar Company LLC |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Minimum amount annual distributions received from Amalgamated Sugar LLC will exceed Snake River loan interest payments |  |  | $ 1.8 |  |

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