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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Derivative [Line Items] |  |  |
Amount of losses, net of income taxes, reclassified to earnings from change in fair value of derivatives component of accumulated other comprehensive loss | $ 500,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |
Estimated reclassification of losses, net of income taxes, from the change in fair value of derivatives component of accumulated other comprehensive loss to earnings during the next twelve months | 1,000,000 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Aggregate notional principal amount of outstanding interest rate swap agreements | 150,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Net payments under derivative swap agreements | 400,000 us-gaap_DerivativeCostOfHedgeNetOfCashReceived / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Net payments under derivative swap agreements | 300,000 us-gaap_DerivativeCostOfHedgeNetOfCashReceived / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember |  |
Principal amount of natural gas swap agreements (mmbtu) | 1,233,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember |  |
Hedged portion of estimated twelve month exposure to natural gas price fluctuations (percent) | 29.00%us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember |  |
Foreign Currency Exchange Rate Risk [Member] |  |  |
Derivative [Line Items] |  |  |
Foreign currency (losses) gains of net investment hedges included in accumulated other comprehensive (loss) income | 29,900,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Cash and cash equivalents | 129,078,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 1,503,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 710,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = slgn_CommodityContractNaturalGasMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Cash and cash equivalents | 129,078,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 1,503,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 710,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = slgn_CommodityContractNaturalGasMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Bank debt [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | 1,110,807,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember |  |
Bank debt [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | 1,110,807,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember |  |
5 1/2% Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | 300,000,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_SeniorNotesFiveandOneHalfPercentMember |  |
5 1/2% Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | 315,750,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_SeniorNotesFiveandOneHalfPercentMember |  |
5% Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | 500,000,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_SeniorNotesFivePercentMember |  |
5% Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Long-Term Debt | $ 515,410,000 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_SeniorNotesFivePercentMember |  |
Five Percent Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |
Derivative [Line Items] |  |  |
Senior note interest rate (percent) | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Five and One Half Percent Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |
Derivative [Line Items] |  |  |
Senior note interest rate (percent) | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Natural Gas [Member] | Minimum [Member] | Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Natural gas fixed price (per mmbtu) | 2.59 us-gaap_DerivativeSwapTypeFixedPrice / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TradingActivityByTypeAxis = us-gaap_NaturalGasReservesMember |  |
Natural Gas [Member] | Maximum [Member] | Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Natural gas fixed price (per mmbtu) | 3.19 us-gaap_DerivativeSwapTypeFixedPrice / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TradingActivityByTypeAxis = us-gaap_NaturalGasReservesMember |  |

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The premium (cost) of a hedge, net of any cash received on settlement during the period. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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- Definition Fixed price related to the price risk swap derivative. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 + Details
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