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Fair Value of Plan Assets by Asset Category (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets $ 754,979us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 691,063us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Equity Securities | United States    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 358,067us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementGeographicalAxis
= country_US		 330,506us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementGeographicalAxis
= country_US
Equity Securities | International    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 74,999us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementGeographicalAxis
= slgn_InternationalMember		 69,811us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementGeographicalAxis
= slgn_InternationalMember
Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 317,562us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember		 286,422us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets $ 4,351us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember		 $ 4,324us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashAndCashEquivalentsMember