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Treasury Stock - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 17, 2015 | Feb. 09, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Remaining authorized repurchase amount | $ 113,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Modified Dutch Auction Authorized Amount |  |  |  | 200,000,000 slgn_ModifiedDutchAuctionAuthorizedAmount
Fees and Expenses Modified Dutch Auction |  |  | 800,000 slgn_FeesandExpensesIncurredRelatedtoModifiedDutchAuctionTenderOffer |
Repurchase of common stock under share repurchase authorization | (162,630,000)us-gaap_PaymentsForRepurchaseOfCommonStock | (113,000)us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Treasury shares issued (shares) | 121,766 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |  |
Issuance of treasury shares, average cost per share (usd per share) | $ 6.30 slgn_Treasurystockissuedduringperiodaveragecostpershare |  |  |
Treasury stock (shares) | 27,041,597 us-gaap_TreasuryStockShares |  |  |
Common Stock Purchased Through Modified Dutch Auction Tender Offer Shares |  |  | 2,766,354 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferShares |
Common Stock Purchased Through Modified Dutch Auction Tender Offer Price Per Share |  |  | $ 58.50 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferPricePerShare |
Common Stock Purchased Through Modified Dutch Auction Tender Offer Value |  |  | $ 161,800,000 slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferValue |
2014 Stock Incentive Plan [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Average cost per share of treasury stock acquired | $ 57.53 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_PlanNameAxis = slgn_TwoZeroOneFourStockIncentivePlanMember |  |  |
Shares repurchased to satisfy minimum employee withholding tax requirements resulting from the vesting of such restricted stock units (shares) | 44,122 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = slgn_TwoZeroOneFourStockIncentivePlanMember |  |  |

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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Price Per Share + References No definition available. + Details
Name: | slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferPricePerShare
Namespace Prefix: | slgn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Shares + References No definition available. + Details
Name: | slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferShares
Namespace Prefix: | slgn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Value + References No definition available. + Details
Name: | slgn_CommonStockPurchasedThroughModifiedDutchAuctionTenderOfferValue
Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fees and Expenses Incurred Related to Modified Dutch Auction Tender Offer + References No definition available. + Details
Name: | slgn_FeesandExpensesIncurredRelatedtoModifiedDutchAuctionTenderOffer
Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Modified Dutch Auction Authorized Amount + References No definition available. + Details
Name: | slgn_ModifiedDutchAuctionAuthorizedAmount
Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Treasury stock issued during period, average cost per share, restricted stock units + References No definition available. + Details
Name: | slgn_Treasurystockissuedduringperiodaveragecostpershare
Namespace Prefix: | slgn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=56944662&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + 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 210.5-02.28,29) -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 29, 30 -Article 5 + Details
Name: | us-gaap_TreasuryStockShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PlanNameAxis=slgn_TwoZeroOneFourStockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |