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Share-Based Compensation (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock-Based Compensation Plan      
Percentage of fair value of the common stock equal to exercise price 100.00%sfy_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisePriceOnFairValue    
Number of Matured Shares Delivered in Stock Swap Transactions   10,752sfy_NumberOfMaturedSharesDeliveredInStockSwapTransactions 20,692sfy_NumberOfMaturedSharesDeliveredInStockSwapTransactions
Percentage of payroll deductions 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate    
Percentage of purchase price for stock acquired under the plan 85.00%sfy_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentagePurchasePriceForStockAcquiredUnderEmployeeStockPurchasePlan    
Number of shares issued under employee stock purchase plan 71,825us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 72,273us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 42,624us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Purchase price of shares issued under employee stock purchase plan $ 11.47sfy_PurchasePriceOfSharesIssuedUnderEmployeeStockPurchasePlan $ 13.08sfy_PurchasePriceOfSharesIssuedUnderEmployeeStockPurchasePlan $ 25.26sfy_PurchasePriceOfSharesIssuedUnderEmployeeStockPurchasePlan
Net cash proceed from excise of stock options     $ 600,000us-gaap_ProceedsFromStockOptionsExercised
Actual income tax benefit from excise of stock options     300,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Share-based compensation expenses 7,309,000us-gaap_ShareBasedCompensation 10,099,000us-gaap_ShareBasedCompensation 13,795,000us-gaap_ShareBasedCompensation
Share-based compensation (capitalized) 3,500,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 5,500,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 5,200,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Stock Option Awards      
Look back period used to estimate expected volatility of stock option grants 5 years 6 months    
Remaining contract life of outstanding stock options. 4 years 8 months    
Remaining contract life of exercisable stock option 4 years 6 months    
Intrinsic value of exercised stock option     900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Restricted Stock Units [Abstract]      
Performance Period for RSUs     4 years 3 months
Percent of payout for performance based restricted stock unit grants 100.00%sfy_PercentOfPayoutForPerformanceBasedRestrictedStockUnitGrants    
Employee Stock Ownership Plan      
Minimum age to participate for ESOP 21 years    
Amount contributed to ESOP   200,000us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP 200,000us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
Shares of common stock contributed to ESOP   14,815us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP 12,995us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Employee Savings Plan [Abstract]      
Employee Savings Plan, Employer Matching Contribution, Percent 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Employee Savings Plan, Maximum Annual Contribution Per Employee, Percent 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Employee Savings Plan, Employer Discretionary Contribution Amount 1,800,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,800,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,500,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount Paid in Cash 900,000sfy_DefinedContributionPlanEmployerDiscretionaryContributionAmountPaidinCash    
Employee Savings Plan, Stock Issued During Period, Shares 352,476us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan 139,850us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan 91,895us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
General and Administrative Expense [Member]      
Stock-Based Compensation Plan      
Share-based compensation expenses 6,700,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 9,300,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 12,900,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Operating Lease Expense [Member]      
Stock-Based Compensation Plan      
Share-based compensation expenses 200,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 300,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 300,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Employee Stock Option [Member]      
Stock-Based Compensation Plan      
Reduction in shares available for future grant by restricted stock 1.0sfy_ReductioninSharesAvailableforFutureGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		    
Stock Option Awards      
Unrecognized compensation cost related to stock options 100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		    
Weighted average recognition period of cost related to stock options 1 month    
Restricted Stock Awards [Member]      
Stock-Based Compensation Plan      
Reduction in shares available for future grant by restricted stock 1.44sfy_ReductioninSharesAvailableforFutureGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Stock Option Awards      
Unrecognized compensation cost related to stock options 9,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Weighted average recognition period of cost related to stock options 1 year 6 months    
Restricted Stock Awards [Abstract]      
Number of shares issued to employees, consultants and directors 747,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 869,430us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 543,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Fair value of non-option shares granted $ 11.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 14.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 31.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Grant date fair value of shares vested 11,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 12,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 10,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Performance Awards (RSUs) [Member]      
Stock-Based Compensation Plan      
Reduction in shares available for future grant by restricted stock 1.44sfy_ReductioninSharesAvailableforFutureGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		    
Stock Option Awards      
Unrecognized compensation cost related to stock options $ 2,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		    
Weighted average recognition period of cost related to stock options 1 year 10 months    
Restricted Stock Awards [Abstract]      
Number of shares issued to employees, consultants and directors 185,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 189,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		  
Vesting period 3 years 1 month    
Fair value of non-option shares granted $ 11.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 15.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		  
Restricted Stock Units [Abstract]      
Performance Period for RSUs 3 years    
Minimum Payout [Member]      
Restricted Stock Awards [Abstract]      
Vesting period 3 years    
Maximum Payout [Member]      
Restricted Stock Units [Abstract]      
Percent of payout for performance based restricted stock unit grants 200.00%sfy_PercentOfPayoutForPerformanceBasedRestrictedStockUnitGrants
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Employee Stock Ownership Plan      
Criteria for ESOP 1 year    
Employee Stock Purchase Plan [Member]      
Stock-Based Compensation Plan      
Shares available for future grant under stock compensation plans 318,027us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sfy_EmployeeStockPurchasePlanMember		    
Share-Based Compensation Plan [Member]      
Stock-Based Compensation Plan      
Shares available for future grant under stock compensation plans 1,814,928us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember