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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable securities | $ 253.5 | $ 254.9
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% |
Additional preferential share receivable in case distributions are below this base level | 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 |
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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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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