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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current                      
Federal                 $ 25,178,000us-gaap_CurrentFederalTaxExpenseBenefit $ 19,804,000us-gaap_CurrentFederalTaxExpenseBenefit $ 13,163,000us-gaap_CurrentFederalTaxExpenseBenefit
State                 4,391,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,243,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,732,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign                 4,041,000us-gaap_CurrentForeignTaxExpenseBenefit 3,926,000us-gaap_CurrentForeignTaxExpenseBenefit 3,920,000us-gaap_CurrentForeignTaxExpenseBenefit
Deferred                      
Federal                 2,264,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,646,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (544,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 142,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 404,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (98,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign                 (225,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (430,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 830,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Income tax expense (benefit) 4,942,000us-gaap_IncomeTaxExpenseBenefit 11,577,000us-gaap_IncomeTaxExpenseBenefit 11,667,000us-gaap_IncomeTaxExpenseBenefit 7,605,000us-gaap_IncomeTaxExpenseBenefit 4,290,000us-gaap_IncomeTaxExpenseBenefit 10,870,000us-gaap_IncomeTaxExpenseBenefit 11,177,000us-gaap_IncomeTaxExpenseBenefit 4,256,000us-gaap_IncomeTaxExpenseBenefit 35,791,000us-gaap_IncomeTaxExpenseBenefit 30,593,000us-gaap_IncomeTaxExpenseBenefit 20,003,000us-gaap_IncomeTaxExpenseBenefit
Income and loss from continuing operations before income taxes                      
Domestic                 90,142,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 74,912,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 65,705,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign                 9,180,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 6,652,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (3,784,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before taxes 15,322,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 32,191,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 32,118,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 19,691,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 11,958,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 30,876,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 29,679,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 9,051,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 99,322,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 81,564,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 61,921,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Reconciliations between the statutory federal income tax rates and effective income tax rates                      
Federal tax rate (as a percent)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit (as a percent)                 3.00%ssd_EffectiveIncomeTaxRateReconciliationStateIncomeTaxes 3.00%ssd_EffectiveIncomeTaxRateReconciliationStateIncomeTaxes 2.90%ssd_EffectiveIncomeTaxRateReconciliationStateIncomeTaxes
Tax benefit of domestic manufacturing deduction (as a percent)                 (2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Change in valuation allowance (as a percent)                 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 6.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Difference between United States statutory and foreign local tax rates (as a percent)                 (0.40%)ssd_EffectiveIncomeTaxRateReconciliationLocalIncomeTaxes 0.10%ssd_EffectiveIncomeTaxRateReconciliationLocalIncomeTaxes 2.60%ssd_EffectiveIncomeTaxRateReconciliationLocalIncomeTaxes
Change in uncertain tax position (as a percent)                 (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Worthless stock deduction on Irish subsidiary                 0.00%ssd_EffectiveIncomeTaxRateReconciliationDeductionsWorthlessStockOfSubsidiary 0.00%ssd_EffectiveIncomeTaxRateReconciliationDeductionsWorthlessStockOfSubsidiary 15.40%ssd_EffectiveIncomeTaxRateReconciliationDeductionsWorthlessStockOfSubsidiary
Non-deductible goodwill write-off                 0.00%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillWriteOff 0.00%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillWriteOff 1.10%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGoodwillWriteOff
Non-deductible professional fee                 0.00%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseProfessionalFee 0.00%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseProfessionalFee 1.30%ssd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseProfessionalFee
Other (as a percent)                 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (as a percent)                 36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Additional disclosures                      
Tax benefit from worthless stock deduction                     $ 9,900,000ssd_IncomeTaxReconciliationDeductionsWorthlessStockOfSubsidiary