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Long-Term Debt Senior Notes (Detail) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 09, 2013
Mar. 23, 2012
Apr. 09, 2012
Jun. 30, 2012
Debt Instrument [Line Items]                
Loss on early extinguishment of debt $ 1,500,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 1,474,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 2,068,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 38,704,000us-gaap_GainsLossesOnExtinguishmentOfDebt        
5½% Senior Notes [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount         300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Debt Instrument Offering Price Percentage         100.00%slgn_DebtInstrumentOfferingPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Redemption Price Percent If Change In Control Occurs         101.00%slgn_RedemptionPricePercentIfChangeInControlOccurs
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
5½% Senior Notes [Member] | Prior to August 1, 2016 | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument Redemption Date         August 1, 2016      
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering         35.00%slgn_MaximumRedemptionPercentAllowedAndLimitedToProceedsFromEquityOffering
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodSixMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Debt Redemption Price Percent Of Principal Amount         105.50%slgn_DebtRedemptionPricePercentOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodSixMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
5½% Senior Notes [Member] | Prior to August 1, 2017 | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument Redemption Date         August 1, 2017      
Debt Redemption Price Percent Of Principal Amount         100.00%slgn_DebtRedemptionPricePercentOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodSevenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
5% Senior Notes due 2020 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount           500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt Instrument Offering Price Percentage           100.00%slgn_DebtInstrumentOfferingPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Redemption Price Percent If Change In Control Occurs           101.00%slgn_RedemptionPricePercentIfChangeInControlOccurs
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
5% Senior Notes due 2020 [Member] | Prior to April 01, 2016 | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument Redemption Date           April 1, 2016    
5% Senior Notes due 2020 [Member] | Prior to April 1, 2015 | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument Redemption Date           April 1, 2015    
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering           35.00%slgn_MaximumRedemptionPercentAllowedAndLimitedToProceedsFromEquityOffering
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodNineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt Redemption Price Percent Of Principal Amount           105.00%slgn_DebtRedemptionPricePercentOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodNineMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
5% Senior Notes due 2020 [Member] | Prior to April 1, 2016 | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument Redemption Date           April 1, 2016    
Debt Redemption Price Percent Of Principal Amount           100.00%slgn_DebtRedemptionPricePercentOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= slgn_DebtInstrumentRedemptionPeriodTenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
7.25 % Senior Notes [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Redemption Price Percent Of Principal Amount             112.3715%slgn_DebtRedemptionPricePercentOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= slgn_SevenPointTwoFivePercentSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Extinguishment of Debt, Amount             250,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= slgn_SevenPointTwoFivePercentSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Early Repayment of Debt             280,900,000us-gaap_EarlyRepaymentOfSubordinatedDebt
/ us-gaap_DebtInstrumentAxis
= slgn_SevenPointTwoFivePercentSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Loss on early extinguishment of debt               $ 38,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= slgn_SevenPointTwoFivePercentSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember