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Quarterly Results of Operations (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 910,164,000 us-gaap_SalesRevenueNet | [1] | $ 1,228,444,000 us-gaap_SalesRevenueNet | [1] | $ 917,336,000 us-gaap_SalesRevenueNet | [1] | $ 855,846,000 us-gaap_SalesRevenueNet | [1] | $ 864,827,000 us-gaap_SalesRevenueNet | [2] | $ 1,167,921,000 us-gaap_SalesRevenueNet | [2] | $ 880,029,000 us-gaap_SalesRevenueNet | [2] | $ 795,741,000 us-gaap_SalesRevenueNet | [2] | $ 3,911,790,000 us-gaap_SalesRevenueNet |  | $ 3,708,518,000 us-gaap_SalesRevenueNet |  | $ 3,588,318,000 us-gaap_SalesRevenueNet |
Gross profit | 122,502,000 us-gaap_GrossProfit | [1] | 205,614,000 us-gaap_GrossProfit | [1] | 143,707,000 us-gaap_GrossProfit | [1] | 128,007,000 us-gaap_GrossProfit | [1] | 119,984,000 us-gaap_GrossProfit | [2] | 187,825,000 us-gaap_GrossProfit | [2] | 128,160,000 us-gaap_GrossProfit | [2] | 111,273,000 us-gaap_GrossProfit | [2] | 599,830,000 us-gaap_GrossProfit |  | 547,242,000 us-gaap_GrossProfit |  | 517,559,000 us-gaap_GrossProfit |
Net income | 23,636,000 us-gaap_ProfitLoss | [1] | 83,276,000 us-gaap_ProfitLoss | [1] | 44,003,000 us-gaap_ProfitLoss | [1] | 31,476,000 us-gaap_ProfitLoss | [1] | 23,276,000 us-gaap_ProfitLoss | [2] | 77,175,000 us-gaap_ProfitLoss | [2] | 59,529,000 us-gaap_ProfitLoss | [2] | 25,433,000 us-gaap_ProfitLoss | [2] | 182,391,000 us-gaap_ProfitLoss |  | 185,413,000 us-gaap_ProfitLoss |  | 151,346,000 us-gaap_ProfitLoss |
Basic net income per share (in dollars per share) | $ 0.37 us-gaap_EarningsPerShareBasic | [1],[3] | $ 1.31 us-gaap_EarningsPerShareBasic | [1],[3] | $ 0.69 us-gaap_EarningsPerShareBasic | [1],[3] | $ 0.50 us-gaap_EarningsPerShareBasic | [1],[3] | $ 0.37 us-gaap_EarningsPerShareBasic | [2],[3] | $ 1.22 us-gaap_EarningsPerShareBasic | [2],[3] | $ 0.93 us-gaap_EarningsPerShareBasic | [2],[3] | $ 0.38 us-gaap_EarningsPerShareBasic | [2],[3] | $ 2.88 us-gaap_EarningsPerShareBasic |  | $ 2.89 us-gaap_EarningsPerShareBasic |  | $ 2.18 us-gaap_EarningsPerShareBasic |
Diluted net income per share (in dollars per share) | $ 0.37 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 1.31 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 0.69 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 0.49 us-gaap_EarningsPerShareDiluted | [1],[3] | $ 0.36 us-gaap_EarningsPerShareDiluted | [2],[3] | $ 1.21 us-gaap_EarningsPerShareDiluted | [2],[3] | $ 0.93 us-gaap_EarningsPerShareDiluted | [2],[3] | $ 0.38 us-gaap_EarningsPerShareDiluted | [2],[3] | $ 2.86 us-gaap_EarningsPerShareDiluted |  | $ 2.87 us-gaap_EarningsPerShareDiluted |  | $ 2.17 us-gaap_EarningsPerShareDiluted |
Dividends per share (in dollars per share) | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid | [2] | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid | [2] | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid | [2] | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid | [2] | $ 0.6 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 0.56 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 0.48 us-gaap_CommonStockDividendsPerShareCashPaid |
Rationalization charges | 9,500,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 2,500,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 900,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 1,600,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 8,400,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 1,300,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 900,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 1,400,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 14,481,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 11,987,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 8,660,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 360,853,000 us-gaap_OperatingIncomeLoss |  | 324,180,000 us-gaap_OperatingIncomeLoss |  | 325,509,000 us-gaap_OperatingIncomeLoss |
Plant start-up costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 slgn_StartUpCosts |  |  |  |  |  |  |
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 |
Business Combination, Acquisition Related Costs |  |  | 300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  | 200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 1,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  | 200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |  |  |  |
Charge included for the remeasurement of net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 slgn_ChargeForRemeasurementOfNetAssets |  |  |  |  |  |  |
Venezuela [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) | (500,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | 800,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | (2,900,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | (500,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | 2,300,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | 100,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | (1,100,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  | (4,200,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = slgn_VenezuelaMember |  |  |  |  |  |  |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Rationalization charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,938,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [4] | (13,756,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [5] | (9,943,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [6]
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ 1,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ 1,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
[1] | The first, second, third and fourth quarters of 2014 include rationalization charges of $1.6 million, $0.9 million, $2.5 million and $9.5 million, respectively, and (loss) income from operations in Venezuela of $(0.5) million, $(2.9) million, $0.8 million and $(0.5) million, respectively. The first quarter of 2014 includes a loss on early extinguishment of debt of $1.5 million. The first and third quarters of 2014 include costs attributable to announced acquisitions of $0.2 million and $0.3 million, respectively.
[2] | The first, second, third and fourth quarters of 2013 include rationalization charges of $1.4 million, $0.9 million, $1.3 million and $8.4 million, respectively, and (loss) income from operations in Venezuela of $(4.2) million, $(1.1) million, $0.1 million and $2.3 million, respectively. The loss from operations in Venezuela for the first quarter of 2013 includes a charge of $3.0 million for the remeasurement of net assets due to a currency devaluation. The first, third and fourth quarters of 2013 include costs attributable to announced acquisitions of $0.2 million, $1.0 million and $0.3 million, respectively. The first quarter of 2013 includes new plant start-up costs of $0.8 million.
[3] | Net income per share data is computed independently for each of the periods presented. Accordingly, the sum of the quarterly earnings per share amounts may not equal the total for the year.
[4] | Closures includes a loss from operations in Venezuela of $3.1 million. Corporate includes costs attributable to announced acquisitions of $0.5 million.
[5] | Metal containers includes new plant start-up costs of $0.8 million. Closures includes a loss from operations in Venezuela of $2.9 million, which includes a charge of $3.0 million for the remeasurement of net assets due to a currency devaluation. Corporate includes costs attributable to announced acquisitions of $1.5 million.
[6] | Metal containers includes new plant start-up costs of $6.4 million. Closures includes income from operations in Venezuela of $5.1 million. Corporate includes costs attributable to announced acquisitions of $1.5 million.

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