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Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit	3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Valuation allowance	(4.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(231.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	41.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Domestic production deduction	(2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Bad debt deduction	0.00%fss_EffectiveIncomeTaxRateReconciliationBadDebt	0.00%fss_EffectiveIncomeTaxRateReconciliationBadDebt	(24.90%)fss_EffectiveIncomeTaxRateReconciliationBadDebt
Asset dispositions and write-offs	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets	(29.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets
Repatriation effects	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	1.50%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Tax reserves	(1.20%)fss_EffectiveIncomeTaxRateReconciliationTaxReserves	0.00%fss_EffectiveIncomeTaxRateReconciliationTaxReserves	(1.00%)fss_EffectiveIncomeTaxRateReconciliationTaxReserves
R&D tax credits	(0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	(1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Foreign tax rate effects	(2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign	(4.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign	(7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign
Other, net	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate	27.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(202.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	15.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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