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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock option exercises, tax benefit | $ 580 | $ 2,576 | $ 2,952
Net issuance of treasury stock for vested restricted stock units, tax benefit | $ 721 | $ 1,856 | $ 408
Treasury shares netted from common stock shares issued for two-for-one stock split |  |  | 5,171

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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: | debit
Period Type: | duration

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- Definition Number of treasury shares excluded from the increase in issued common stock shares to arrive at the net increase in common stock shares outstanding. + References No definition available. + Details
Name: | slgn_TreasurySharesNettedFromCommonStock
Namespace Prefix: | slgn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities. + 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=6576910&loc=d3e11283-113907 + Details
Name: | us-gaap_TaxBenefitFromStockOptionsExercised1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration