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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Stockholders' Equity [Abstract] |  |  |
Stock option exercises, tax benefit | $ 0 us-gaap_DeferredTaxExpenseFromStockOptionsExercised | $ 0 us-gaap_DeferredTaxExpenseFromStockOptionsExercised | $ 580 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Net issuance of treasury stock for vested restricted stock units, tax benefit | $ 3,256 slgn_TaxBenefitFromIssuanceOfTreasuryStockForVestedRestrictedUnits | $ 460 slgn_TaxBenefitFromIssuanceOfTreasuryStockForVestedRestrictedUnits | $ 721 slgn_TaxBenefitFromIssuanceOfTreasuryStockForVestedRestrictedUnits

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- Definition Reductions in the entity's income taxes that arise when compensation cost (from non-qualified restricted stock units) recognized on the entity's tax return exceeds compensation cost from non-qualified restricted stock units recognized on the income statement. This element represents the tax benefit related to the treasury stocks that were reissued for the restricted stock units. + References No definition available. + Details
Name: | slgn_TaxBenefitFromIssuanceOfTreasuryStockForVestedRestrictedUnits
Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration