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Redemption Price of Notes Plus Accrued and Unpaid Interest Thereon to Redemption Date (Detail) (Senior Notes [Member])
 12 Months Ended
Dec. 31, 2014
5½% Senior Notes [Member] | 2017 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 102.75%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5½% Senior Notes [Member] | 2018 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 101.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5½% Senior Notes [Member] | 2019 and thereafter [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FiveandOneHalfPercentSeniorNotesdue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5% Senior Notes due 2020 [Member] | 2016 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 102.50%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5% Senior Notes due 2020 [Member] | 2017 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 101.25%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5% Senior Notes due 2020 [Member] | 2018 and thereafter [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= slgn_FivePercentSeniorNotesdue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFiveMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember