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Long-Term Debt Credit Facility Agreements (Detail) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended
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Jan. 14, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 U S Term Loans [Member] | Jan. 14, 2014 U S Term Loans [Member] USD ($) | Dec. 31, 2014 Canadian Term Loans [Member] CAD | Jan. 14, 2014 Canadian Term Loans [Member] CAD | Dec. 31, 2014 Term Loan [Member] USD ($) | Dec. 31, 2014 Euro Term Loans [Member] | Jan. 14, 2014 Euro Term Loans [Member] EUR (€) | Dec. 31, 2014 Term Loan Facility [Member] | Dec. 31, 2013 Term Loan Facility [Member] | Dec. 31, 2012 Term Loan Facility [Member] | Dec. 31, 2014 Revolving Loan [Member] USD ($) | Dec. 31, 2013 Revolving Loan [Member] | Dec. 31, 2012 Revolving Loan [Member] | Jan. 14, 2014 U S Revolving Loans [Member] USD ($) | Jan. 14, 2014 Canadian Revolving Loans [Member] CAD | Jan. 14, 2014 Revolving And Term Loans [Member] | Dec. 31, 2014 Revolving And Term Loans [Member] USD ($) | Jan. 14, 2014 Revolving And Term Loans [Member] Base Rate [Member] | Dec. 31, 2014 Maximum [Member] USD ($) | Jan. 14, 2014 Maximum [Member] Revolving Loan [Member] | Jan. 14, 2014 Minimum [Member] Revolving Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, due in the next twelve months |  |  | $ 125,130,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  |  |  |  | $ 34,600,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding under the credit agreement |  |  |  |  |  |  | 365,000,000 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = slgn_USTermLoansMember |  | 70,000,000 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = slgn_CanadianTermLoansMember |  |  | 220,000,000 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = slgn_EuroTermLoansMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings available under the revolving loan facilities |  |  |  |  |  |  |  | 15,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = slgn_CanadianTermLoansMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 962,600,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingAndTermLoansMember |  |  |  |
Repayments of long-term debt |  |  | 754,834,000 us-gaap_RepaymentsOfLongTermDebt | 308,257,000 us-gaap_RepaymentsOfLongTermDebt | 285,932,000 us-gaap_RepaymentsOfLongTermDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember | 2.00%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember | 2.20%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember | 1.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember | 1.90%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember | 1.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember |  |  |  |  |  |  |  |
Weighted average interest rate after interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%slgn_DebtWeightedAverageInterestRateAfterConsiderationOfInterestRateSwap / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember | 2.70%slgn_DebtWeightedAverageInterestRateAfterConsiderationOfInterestRateSwap / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember | 2.60%slgn_DebtWeightedAverageInterestRateAfterConsiderationOfInterestRateSwap / us-gaap_LongtermDebtTypeAxis = slgn_TermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 985,600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = slgn_USRevolvingLoansMember | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = slgn_CanadianRevolvingLoansMember |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity |  |  | 1,250,000,000 slgn_LineOfCreditFacilityUncommittedAdditionalBorrowingCapacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 625,000,000 slgn_LineOfCreditFacilityUncommittedAdditionalBorrowingCapacity / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Line of credit facility, margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingAndTermLoansMember |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingAndTermLoansMember |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  | 1.76%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = slgn_USTermLoansMember |  | 2.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = slgn_CanadianTermLoansMember |  |  | 1.56%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = slgn_EuroTermLoansMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember |  |  |  |  |  |  |  |  | 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Letter Of Credit Maximum Borrowing Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 slgn_LetterOfCreditMaximumBorrowingAmount / us-gaap_LongtermDebtTypeAxis = slgn_RevolvingLoanMember |  |  |  |  |  |  |  |  |  |
Letters Of Credit Facing Fee | 500 slgn_LettersOfCreditFrontingFee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters Of Credit Facing Fee Percentage | 0.25%slgn_LettersOfCreditFrontingFeePercentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  | $ 1,500,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 1,474,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 2,068,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 38,704,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt, Weighted Average Interest Rate after Consideration of Interest Rate Swap + References No definition available. + Details
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- Definition Letter of Credit Maximum Borrowing Amount + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Letters Of Credit Fronting Fee + References No definition available. + Details
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Balance Type: | debit
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- Definition Letters Of Credit Fronting Fee Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Uncommitted Additional Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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