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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) |  | $ 360,853,000 us-gaap_OperatingIncomeLoss |  | $ 324,180,000 us-gaap_OperatingIncomeLoss |  | $ 325,509,000 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  |  |
Start Up Costs | 800,000 slgn_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 |  | 5,100,000 slgn_OperatingIncomeLossVenezuela / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember |  |  |  |  |  |  |  |
Operating Income (Loss) |  | 75,592,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | [1] | 63,046,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | [2] | 73,148,000 us-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 | 800,000 us-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 | 2,300,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember | 100,000 us-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) |  | 248,704,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |  | 236,327,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | [2] | 231,456,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | [3] |  |  |  |  |  |  |
Start Up Costs |  |  |  | $ 800,000 slgn_StartUpCosts / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember |  | $ 6,400,000 slgn_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.

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- Definition Operating Income(Loss) Venezuela + References No definition available. + Details
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Namespace Prefix: | slgn_
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Balance Type: | credit
Period Type: | duration

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- Definition Percentage of Total Revenue + References No definition available. + Details
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- Definition Start up Costs + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |