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Capital Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 08, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2014 | Feb. 09, 2015
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 200,000,000 us-gaap_CommonStockSharesAuthorized | 200,000,000 us-gaap_CommonStockSharesAuthorized |  |  |
Common Stock, par value |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |
Preferred stock, shares authorized |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |
Preferred stock, par value |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |
Common stock authorized for repurchase |  |  |  |  | $ 300,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Repurchases of common stock |  | 508,667 us-gaap_TreasuryStockSharesAcquired | 354,154 us-gaap_TreasuryStockSharesAcquired | 805,346 us-gaap_TreasuryStockSharesAcquired |  |
Common stock repurchased, total purchase price |  | 24,666,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 267,607,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 34,109,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Common stock purchased through modified dutch auction tender offer - in shares | 5,524,861 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferShares |  |  |  |  |
Common stock purchased through modified dutch auction tender offer - price per share | $ 45.25 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferPricePerShare |  |  |  |  |
Common stock purchased through modified dutch auction tender offer - total purchase price in dollars | 250,000,000 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferValue |  |  |  |  |
Fees And Expenses Incurred Related To Modified Dutch Auction Tender Offer | 1,000,000 slgn_FeesAndExpensesIncurredRelatedToModifiedDutchAuctionTenderOffer |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 48.47 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 46.90 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 42.33 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Treasury Stock, Value, Acquired, Cost Method |  | 24,666,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 267,607,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 34,109,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |
Common stock repurchase, remaining authorized amount |  | 275,500,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |
Treasury shares issued |  | 531,024 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 149,304 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 132,846 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |
Average cost for restricted stock units |  | $ 6.30 slgn_StockIssuedEmployeeStockPurchasePlanAveragePricePerShare | $ 6.63 slgn_StockIssuedEmployeeStockPurchasePlanAveragePricePerShare | $ 6.63 slgn_StockIssuedEmployeeStockPurchasePlanAveragePricePerShare |  |
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested |  | 234,440 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 58,812 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 43,874 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation |  |
Common stock repurchased, average cost |  | $ 48.87 slgn_StockRepurchasedDuringPeriodAveragePrice | $ 43.55 slgn_StockRepurchasedDuringPeriodAveragePrice | $ 42.64 slgn_StockRepurchasedDuringPeriodAveragePrice |  |
Treasury stock, shares |  | 24,352,887 us-gaap_TreasuryStockShares | 24,140,804 us-gaap_TreasuryStockShares |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Modified Dutch Auction, Authorized Share Amount |  |  |  |  |  | 3,652,968 slgn_ModifiedDutchAuctionAuthorizedShareAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Authorized Amount |  |  |  |  |  | 200,000,000 slgn_ModifiedDutchAuctionAuthorizedAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Minimum Share Price |  |  |  |  |  | $ 54.75 slgn_ModifiedDutchAuctionMinimumSharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Maximum Share Price |  |  |  |  |  | $ 58.50 slgn_ModifiedDutchAuctionMaximumSharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Stock Repurchase Progam for 2013 [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock repurchased, total purchase price |  | 24,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = slgn_StockRepurchaseProgamfor2013Member | 16,600,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = slgn_StockRepurchaseProgamfor2013Member |  |  |
Board of Directors Co-Chairman [Member] | Stock Repurchase Program for 2012 [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Repurchases of common stock | 515,806 us-gaap_TreasuryStockSharesAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = slgn_BoardofDirectorsCoChairmanMember / us-gaap_ShareRepurchaseProgramAxis = slgn_StockRepurchaseProgramfor2012Member |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 45.25 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = slgn_BoardofDirectorsCoChairmanMember / us-gaap_ShareRepurchaseProgramAxis = slgn_StockRepurchaseProgramfor2012Member |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 23,300,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = slgn_BoardofDirectorsCoChairmanMember / us-gaap_ShareRepurchaseProgramAxis = slgn_StockRepurchaseProgramfor2012Member |  |  |  |  |

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- Definition Fees and Expenses Incurred Related to Modified Dutch Auction Tender Offer + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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