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Valuation And Qualifying Accounts (Detail) (Allowance for doubtful accounts receivable, USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 5,717 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 5,869 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 5,934 us-gaap_ValuationAllowancesAndReservesBalance |
Charged to costs and expenses | 1,871 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 921 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 774 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Charged to other accounts | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts |
Other | (1,702)slgn_ValuationAllowancesAndReservesChargedOrCreditedToOtherAccounts | [1] | (992)slgn_ValuationAllowancesAndReservesChargedOrCreditedToOtherAccounts | [1] | (1,018)slgn_ValuationAllowancesAndReservesChargedOrCreditedToOtherAccounts | [1]
Balance at end of period | 5,497 us-gaap_ValuationAllowancesAndReservesBalance |  | 5,717 us-gaap_ValuationAllowancesAndReservesBalance |  | 5,869 us-gaap_ValuationAllowancesAndReservesBalance |
Foreign Currency Translation [Member] |  |  |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Cumulative translation adjustment | $ (389)us-gaap_ValuationAllowancesAndReservesAdjustments / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ (81)us-gaap_ValuationAllowancesAndReservesAdjustments / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ 179 us-gaap_ValuationAllowancesAndReservesAdjustments / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
[1] | Uncollectible accounts written off, net of recoveries.

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- Definition Valuation Allowances and Reserves Charged or Credited to Other Accounts + References No definition available. + Details
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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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