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Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 09, 2013 | Mar. 23, 2012
--- | --- | --- | --- | ---
Carrying Amount |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | $ 222,591 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 160,463 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Carrying Amount | Interest rate swap agreements |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 1,196 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 6,895 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Carrying Amount | Natural gas swap agreements |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 746 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 22 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Fair Value |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 222,591 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 160,463 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Fair Value | Interest rate swap agreements |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 1,196 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 6,895 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Fair Value | Natural gas swap agreements |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 746 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 22 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Senior Notes [Member] | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Stated interest rate |  |  | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes [Member] | 5% Senior Notes due 2020 [Member] |  |  |  |
Liabilities: |  |  |  |
Stated interest rate |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes [Member] | Carrying Amount | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 300,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 300,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Senior Notes [Member] | Carrying Amount | 5% Senior Notes due 2020 [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 500,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 500,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Senior Notes [Member] | Fair Value | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 307,500 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 298,125 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FiveandOneHalfPercentSeniorNotesdue2022Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Senior Notes [Member] | Fair Value | 5% Senior Notes due 2020 [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 500,715 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 495,625 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = slgn_FivePercentSeniorNotesdue2020Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Bank Borrowings [Member] | Carrying Amount |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 798,963 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember | 903,836 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember |  |
Bank Borrowings [Member] | Fair Value |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | $ 798,963 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember | $ 903,836 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = slgn_BankBorrowingsMember |  |

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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
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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=35706170&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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Balance Type: | na
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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