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Income Taxes Income Taxes - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |
Current deferred tax assets | $ 22,400,000 us-gaap_DeferredTaxAssetsNetCurrent | $ 23,700,000 us-gaap_DeferredTaxAssetsNetCurrent
Long term deferred tax assets | 19,900,000 us-gaap_DeferredTaxAssetsNetNoncurrent | 19,600,000 us-gaap_DeferredTaxAssetsNetNoncurrent
Long term deferred tax liabilities | 271,300,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 252,200,000 us-gaap_DeferredTaxLiabilitiesNoncurrent
Valuation allowance, amount | 7,858,000 us-gaap_DeferredTaxAssetsValuationAllowance | 11,704,000 us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowance, deferred tax asset, change in amount | (3,800,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Unrecognized tax benefits, income tax penalties and interest accrued | 3,400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 2,800,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits, net of associated tax assets and excluding federal tax benefit of state taxes, interest and penalties recorded in Other Liabilities | 27,800,000 slgn_UnrecognizedTaxBenefitsNetOfFederalBenefitsOnStateIncomeTaxPositionsAndInterest | 26,700,000 slgn_UnrecognizedTaxBenefitsNetOfFederalBenefitsOnStateIncomeTaxPositionsAndInterest
Asset associated with uncertain tax position recorded in Other Assets | 16,100,000 slgn_DeferredTaxAssetsFederalAndStateBenefitOfUncertainTaxPositions | 15,900,000 slgn_DeferredTaxAssetsFederalAndStateBenefitOfUncertainTaxPositions
Unrecognized tax benefits would impact effective tax rate | 11,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 11,600,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Income Tax Expense (Benefit) |  | 20,500,000 slgn_IncomeTaxBenefittoReconciliationDeductionSettlementWithTaxingAuthoritiesAmount
Undistributed earnings from foreign earnings | 74,300,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |
Deferred tax liability related to undistributed earnings from foreign earnings If the earnings of foreign subsidiaries were not indefinitely reinvested | 26,000,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 50,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 28,346,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Internal Revenue Service (IRS) [Member] | Silgan Holdings [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 3,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = slgn_PortolaPackagingIncMember |
Foreign Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 24,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Net operating loss carryforward subject to expiration | 12,200,000 slgn_OperatingLossCarryforwardSubjecttoExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Foreign Tax Authority [Member] | Minimum [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2015 |
Foreign Tax Authority [Member] | Maximum [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2025 |
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 5,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
State and Local Jurisdiction | Minimum [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2015 |
State and Local Jurisdiction | Maximum [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2032 |
Deferred Tax Asset, Operating Loss Carryforwards, Domestic |  |
Income Taxes [Line Items] |  |
Valuation allowance, amount | $ 7,900,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = slgn_DeferredTaxAssetOperatingLossCarryforwardsForeignMemberMember |

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