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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 | $ 816,601,000 us-gaap_SalesRevenueNet |  | $ 855,846,000 us-gaap_SalesRevenueNet |
Depreciation and amortization | 35,643,000 us-gaap_DepreciationAndAmortization | [1] | 37,350,000 us-gaap_DepreciationAndAmortization | [1]
Rationalization charges | 725,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 1,588,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |
Operating Income (Loss) | 67,061,000 us-gaap_OperatingIncomeLoss |  | 68,010,000 us-gaap_OperatingIncomeLoss |
Amortization of debt issuance costs excluded from depreciation and amortization | 1,000,000 us-gaap_AmortizationOfFinancingCosts |  | 1,100,000 us-gaap_AmortizationOfFinancingCosts |
Metal Containers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 458,898,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |  | 468,405,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |
Depreciation and amortization | 17,192,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | [1] | 17,379,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | [1]
Rationalization charges | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |
Operating Income (Loss) | 40,667,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |  | 40,453,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |
Closures [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 198,080,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember |  | 213,797,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember |
Depreciation and amortization | 9,727,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | [1] | 10,804,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | [1]
Rationalization charges | 336,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember |  | 626,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember |
Operating Income (Loss) | 21,575,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | [2] | 17,766,000 us-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 | 159,623,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |  | 173,644,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |
Depreciation and amortization | 8,692,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember | [1] | 9,135,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember | [1]
Rationalization charges | 389,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |  | 962,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |
Operating Income (Loss) | 9,211,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |  | 12,843,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember |
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Depreciation and amortization | 32,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [1] | 32,000 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [1]
Rationalization charges | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-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.

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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