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Condensed Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Statement of Stockholders' Equity [Abstract] |  |
Net issuance of treasury stock for vested restricted stock units, tax benefit | $ 762 slgn_TaxBenefitFromIssuanceOfTreasuryStockForVestedRestrictedUnits | $ 947 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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- Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration