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Business Segment Information - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Operating Income (Loss)   $ 360,853,000us-gaap_OperatingIncomeLoss $ 324,180,000us-gaap_OperatingIncomeLoss $ 325,509,000us-gaap_OperatingIncomeLoss              
Start Up Costs 800,000slgn_StartUpCosts                    
Nestle Food Company                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Percentage of net sales   10.90%slgn_PercentageOfTotalRevenue
/ us-gaap_MajorCustomersAxis
= slgn_NestleFoodCompanyMember
11.50%slgn_PercentageOfTotalRevenue
/ us-gaap_MajorCustomersAxis
= slgn_NestleFoodCompanyMember
11.30%slgn_PercentageOfTotalRevenue
/ us-gaap_MajorCustomersAxis
= slgn_NestleFoodCompanyMember
             
Closures [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Operating Income(Loss) Venezuela   (3,100,000)slgn_OperatingIncomeLossVenezuela
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
(2,900,000)slgn_OperatingIncomeLossVenezuela
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
5,100,000slgn_OperatingIncomeLossVenezuela
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
             
Operating Income (Loss)   75,592,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
[1] 63,046,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
[2] 73,148,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
[3]              
Venezuela [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Operating Income (Loss) (4,200,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
      (500,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
800,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
(2,900,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
(500,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
2,300,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
100,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
(1,100,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_VenezuelaMember
Metal Containers [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Operating Income (Loss)   248,704,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
236,327,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
[2] 231,456,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
[3]              
Start Up Costs     $ 800,000slgn_StartUpCosts
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
$ 6,400,000slgn_StartUpCosts
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
             
[1] Closures includes a loss from operations in Venezuela of $3.1 million. Corporate includes costs attributable to announced acquisitions of $0.5 million.
[2] Metal containers includes new plant start-up costs of $0.8 million. Closures includes a loss from operations in Venezuela of $2.9 million, which includes a charge of $3.0 million for the remeasurement of net assets due to a currency devaluation. Corporate includes costs attributable to announced acquisitions of $1.5 million.
[3] Metal containers includes new plant start-up costs of $6.4 million. Closures includes income from operations in Venezuela of $5.1 million. Corporate includes costs attributable to announced acquisitions of $1.5 million.