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Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 19, 2014 | May 24, 2014 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Jun. 19, 2014
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | $ (181,797,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (171,544,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (72,635,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax | (14,142,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |  |  |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  | 1,795,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | 3,889,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |  |  |
Other comprehensive loss, net of tax |  |  |  | (70,840,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (10,253,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (15,479,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |
Balance at end of the period |  |  | (171,544,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (252,637,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (181,797,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (171,544,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Additional authorized repurchase amount under the November 2009 share repurchase program |  | 20,000,000 seb_StockRepurchaseProgramAdditionalAuthorizedAmount |  |  |  |  |  |
Common shares repurchased | 16,738 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  | 18,405 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 8,705 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 12,937 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |
Repurchase price (in dollars per share) | $ 2,950 us-gaap_SharePrice |  |  |  |  |  |  | $ 2,950 us-gaap_SharePrice
Repurchase of common stock | 49,377,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  | 53,781,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 23,578,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 26,830,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
Remaining authorized repurchase amount before additional amount authorized under the share repurchase program |  |  |  | 50,846,000 seb_StockRepurchaseProgramRemainingFromOriginalAuthorizedRepurchaseAmount |  |  |  |
Common stock dividend declared and paid (in dollars per share) |  |  | $ 12.00 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |  |
Common stock dividend historical amount on a quarterly basis (in dollars per share) |  |  |  |  |  | $ 0.75 seb_CommonStockDividendsHistoricalAmountOnQuarterlyBasis |  |
Common stock dividend historical amount on annual basis (in dollars per share) |  |  |  |  |  | $ 3.00 seb_CommonStockDividendsHistoricalAmountOnAnnualBasis |  |
Portion of dividend serving as prepayment for next succeeding year (in dollars per share) |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForNextSucceedingYear |  |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForNextSucceedingYear |
Portion of dividend serving as prepayment for second succeeding year (in dollars per share) |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForSecondSucceedingYear |  |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForSecondSucceedingYear |
Portion of dividend serving as prepayment for third succeeding year (in dollars per share) |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForThirdSucceedingYear |  |  |  |  |
Portion of dividend serving as prepayment for fourth succeeding year (in dollars per share) |  |  | $ 3.00 seb_CommonStockDividendPortionServingAsPrepaymentOfDividendForFourthSucceedingYear |  |  |  |  |
Agreement termination gain unrecognized in other comprehensive income, net of tax |  |  |  |  | 1,310,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  |
Income tax rate for foreign currency translation gains and losses (as a percent) |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Cumulative foreign currency translation adjustment, net of related taxes |  |  |  | 55,745,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 41,380,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |
Tax benefit recorded on unrecognized pension cost |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  |  |
Effective income tax rate for components of accumulated other comprehensive loss (as a percent) |  |  |  | 39.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 39.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |  |
Unrecognized pension cost related to employees at certain subsidiaries |  |  |  | 20,001,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | 8,663,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  |  |
Argentine pesos | Sugar |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Net assets of Sugar segment |  |  |  | 121,920,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_ARS / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 151,769,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_ARS / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |
U.S. dollars | Sugar |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Net assets of Sugar segment |  |  |  | 492,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 2,957,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |
Cumulative Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | (155,413,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (109,457,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (38,624,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (45,956,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |
Other comprehensive loss, net of tax |  |  |  | (38,624,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (45,956,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |
Balance at end of the period |  |  |  | (194,037,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (155,413,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | 481,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 2,232,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | 775,000 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1,124,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  | 78,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (627,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |
Other comprehensive loss, net of tax |  |  |  | 853,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1,751,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |
Balance at end of the period |  |  |  | 1,334,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 481,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |
Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | (113,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (122,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  |  |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  | 235,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  |  |
Other comprehensive loss, net of tax |  |  |  | 113,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  |  |
Balance at end of the period |  |  | (113,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  | (113,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Unrecognized Pension Cost |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | (26,752,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (64,206,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (34,664,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 32,938,000 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  | 1,482,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 4,516,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |
Other comprehensive loss, net of tax |  |  |  | (33,182,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 37,454,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |
Balance at end of the period |  |  |  | $ (59,934,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ (26,752,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |

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