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Components of Calculation of Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified | 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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 23,636 us-gaap_ProfitLoss | [1] | $ 83,276 us-gaap_ProfitLoss | [1] | $ 44,003 us-gaap_ProfitLoss | [1] | $ 31,476 us-gaap_ProfitLoss | [1] | $ 23,276 us-gaap_ProfitLoss | [2] | $ 77,175 us-gaap_ProfitLoss | [2] | $ 59,529 us-gaap_ProfitLoss | [2] | $ 25,433 us-gaap_ProfitLoss | [2] | $ 182,391 us-gaap_ProfitLoss | $ 185,413 us-gaap_ProfitLoss | $ 151,346 us-gaap_ProfitLoss
Weighted average number of shares used in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,426 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 64,254 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 69,571 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive common stock equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 319 slgn_IncrementalCommonSharesAttributableToStockOptionsAndRestrictedStockUnits | 404 slgn_IncrementalCommonSharesAttributableToStockOptionsAndRestrictedStockUnits | 318 slgn_IncrementalCommonSharesAttributableToStockOptionsAndRestrictedStockUnits
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,745 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 64,658 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 69,889 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[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.

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