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