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Reportable Business Segment Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net sales $ 816,601,000us-gaap_SalesRevenueNet $ 855,846,000us-gaap_SalesRevenueNet
Depreciation and amortization 35,643,000us-gaap_DepreciationAndAmortization [1] 37,350,000us-gaap_DepreciationAndAmortization [1]
Rationalization charges 725,000us-gaap_RestructuringSettlementAndImpairmentProvisions 1,588,000us-gaap_RestructuringSettlementAndImpairmentProvisions
Operating Income (Loss) 67,061,000us-gaap_OperatingIncomeLoss 68,010,000us-gaap_OperatingIncomeLoss
Amortization of debt issuance costs excluded from depreciation and amortization 1,000,000us-gaap_AmortizationOfFinancingCosts 1,100,000us-gaap_AmortizationOfFinancingCosts
Metal Containers [Member]    
Segment Reporting Information [Line Items]    
Net sales 458,898,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember		 468,405,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Depreciation and amortization 17,192,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember		 [1] 17,379,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember		 [1]
Rationalization charges 0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember		 0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Operating Income (Loss) 40,667,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember		 40,453,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Closures [Member]    
Segment Reporting Information [Line Items]    
Net sales 198,080,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 213,797,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Depreciation and amortization 9,727,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 [1] 10,804,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 [1]
Rationalization charges 336,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 626,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Operating Income (Loss) 21,575,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 [2] 17,766,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 [2]
Operating Income (Loss) Venezuela (100,000)slgn_OperatingIncomeLossVenezuela
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember		 (500,000)slgn_OperatingIncomeLossVenezuela
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Plastic Containers [Member]    
Segment Reporting Information [Line Items]    
Net sales 159,623,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember		 173,644,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Depreciation and amortization 8,692,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember		 [1] 9,135,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember		 [1]
Rationalization charges 389,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember		 962,000us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Operating Income (Loss) 9,211,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember		 12,843,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Corporate [Member]    
Segment Reporting Information [Line Items]    
Net sales 0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Depreciation and amortization 32,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1] 32,000us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1]
Rationalization charges 0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Operating Income (Loss) $ (4,392,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ (3,052,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
[1] Depreciation and amortization excludes amortization of debt issuance costs of $1.0 million and $1.1 million for the three months ended March 31, 2015 and 2014, respectively.
[2] Income from operations of the closures segment includes losses from operations in Venezuela of $0.1 million and $0.5 million for the three months ended March 31, 2015 and 2014, respectively.