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Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 04, 2015 | Mar. 29, 2014 | Dec. 31, 2012 | Apr. 04, 2015 | Mar. 29, 2014 | Dec. 31, 2012 | Dec. 31, 2014
Stockholders' Equity and Accumulated Other Comprehensive Loss |  |  |  |  |  |  |
Remaining authorized repurchase amount under November 2009 share repurchase program | $ 50,846,000 seb_StockRepurchaseProgramRemainingFromOriginalAuthorizedRepurchaseAmount |  |  | $ 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 |  |  |  |
Portion of dividend serving as prepayment for second succeeding year (in dollars per share) |  |  | $ 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 |  |  |  |
Changes in the components of other comprehensive loss (OCL), net of related taxes |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  | (5,958,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (26,775,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent |  |
Investments: |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  | 736,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 15,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |
Amount reclassified from OCL to net earnings |  |  |  | (59,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 511,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  |
Unrealized gain (loss) on investments |  |  |  | 677,000 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 526,000 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  |
Unrealized gain on cash flow hedges |  |  |  |  | 361,000 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent |  |
Pension Cost: |  |  |  |  |  |  |
Unrealized gain |  |  |  | 299,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  |
Amount reclassified from OCL to net earnings |  |  |  | 983,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 320,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  |
Unrecognized pension cost |  |  |  | 1,282,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | 320,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent |  |
Other comprehensive loss, net of tax |  |  |  | (3,999,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (25,568,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Accumulated other comprehensive loss | (256,636,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (256,636,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (252,637,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Income tax rate for foreign currency translation gains and losses (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Cumulative foreign currency translation adjustment, net of related taxes | 60,076,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 49,411,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  | 60,076,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 49,411,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |
Tax benefit recorded on foreign currency translation adjustments | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent |  |  |  |  |
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 | 19,960,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | 8,580,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  | 19,960,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | 8,580,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  |
Argentine pesos | Sugar |  |  |  |  |  |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Net assets of Sugar segment | 119,734,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_ARS / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 119,734,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_ARS / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |
U.S. dollars | Sugar |  |  |  |  |  |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Net assets of Sugar segment | 1,199,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 1,199,000 us-gaap_AssetsNet / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |
Cumulative Foreign Currency Translation Adjustment: |  |  |  |  |  |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Accumulated other comprehensive loss | (199,995,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  | (199,995,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  | (194,037,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Unrealized Gain (Loss) on Investments: |  |  |  |  |  |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Accumulated other comprehensive loss | 2,011,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 2,011,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 1,334,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Unrecognized Pension Cost: |  |  |  |  |  |  |
Components of accumulated other comprehensive loss, net of related taxes |  |  |  |  |  |  |
Accumulated other comprehensive loss | $ (58,652,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  | $ (58,652,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  | $ (59,934,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

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