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Activity in Rationalization Plan Reserves (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions | $ 9,500,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 2,500,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 900,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 1,600,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 8,400,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 1,300,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 900,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 1,400,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 14,481,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 11,987,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | $ 8,660,000 us-gaap_RestructuringSettlementAndImpairmentProvisions
Rationalization Reserve Beginning Balance |  |  |  | 5,534,000 us-gaap_RestructuringReserve |  |  |  | 4,927,000 us-gaap_RestructuringReserve | 5,534,000 us-gaap_RestructuringReserve | 4,927,000 us-gaap_RestructuringReserve | 4,597,000 us-gaap_RestructuringReserve
Rationalization Plan Reserves Utilized and CTA |  |  |  |  |  |  |  |  | (13,647,000)slgn_RationalizationPlanReservesUtilizedandCTA | (11,380,000)slgn_RationalizationPlanReservesUtilizedandCTA | (8,330,000)slgn_RationalizationPlanReservesUtilizedandCTA
Rationalization Reserve Ending Balance | 6,368,000 us-gaap_RestructuringReserve |  |  |  | 5,534,000 us-gaap_RestructuringReserve |  |  |  | 6,368,000 us-gaap_RestructuringReserve | 5,534,000 us-gaap_RestructuringReserve | 4,927,000 us-gaap_RestructuringReserve
Expected Future Restructuring Net Estimated Cash Payable | 11,100,000 slgn_ExpectedFutureRestructuringNetEstimatedCashPayable |  |  |  |  |  |  |  | 11,100,000 slgn_ExpectedFutureRestructuringNetEstimatedCashPayable |  |
Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 11,111,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 5,822,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 5,056,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Rationalization Reserve Beginning Balance |  |  |  | 4,116,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 3,231,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 4,116,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 3,231,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 4,386,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Rationalization Plan Reserves Utilized and CTA |  |  |  |  |  |  |  |  | (9,175,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (4,937,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (6,211,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Rationalization Reserve Ending Balance | 6,052,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 4,116,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 6,052,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 4,116,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 3,231,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 1,572,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,684,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,924,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Rationalization Reserve Beginning Balance |  |  |  | 1,418,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  | 1,696,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,418,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,696,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 211,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Rationalization Plan Reserves Utilized and CTA |  |  |  |  |  |  |  |  | (2,674,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | (1,962,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | (439,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Rationalization Reserve Ending Balance | 316,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  | 1,418,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  | 316,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,418,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,696,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Asset Impairments [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 1,798,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember | 4,481,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember | 1,680,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember
Rationalization Plan Reserves Utilized and CTA |  |  |  |  |  |  |  |  | (1,798,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember | (4,481,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember | (1,680,000)slgn_RationalizationPlanReservesUtilizedandCTA / us-gaap_RestructuringCostAndReserveAxis = slgn_AssetImpairmentsMember
Metal Containers [Member] | Facility Closings and Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | (440,000)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | 2,490,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember | 2,446,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_MetalContainersMember
Closures [Member] | Facility Closings and Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 12,256,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | 5,615,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember | 2,878,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_ClosuresMember
Plastic Containers [Member] | Facility Closings and Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 2,665,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember | 3,882,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember | 3,336,000 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = slgn_PlasticContainersMember
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Corporate Segment [Member] | Facility Closings and Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringCostAndReserveAxis = slgn_FacilityClosingsandRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Rationalization Plan [Member] | Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 4,200,000 us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = slgn_RationalizationPlanMember |  |  |  |  |  |  |  | $ 4,200,000 us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = slgn_RationalizationPlanMember |  |

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- Definition Expected Future Restructuring Net Estimated Cash Payable + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rationalization Plan Reserves Utilized and CTA + 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 Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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