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Multiemployer Pension Plans (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions | $ 6,282,000 us-gaap_MultiemployerPlanPeriodContributions |  | $ 6,162,000 us-gaap_MultiemployerPlanPeriodContributions |  | $ 6,398,000 us-gaap_MultiemployerPlanPeriodContributions |
Defined contribution plans contributions charged to expense | 9,000,000 us-gaap_DefinedContributionPlanCostRecognized |  | 7,800,000 us-gaap_DefinedContributionPlanCostRecognized |  | 7,600,000 us-gaap_DefinedContributionPlanCostRecognized |
Central States, Southeast and Southwest Areas Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
EIN/Pension Plan Number | 36-6044243/001 | [1] |  |  |  |
Pension Protection Act Zone Status | Red | [1] | Red | [1] |  |
FIP / RP Status Pending / Implemented | Implemented | [1] |  |  |  |
Contributions | 1,806,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_CentralStatesSoutheastAndSouthwestAreasPensionFundMember | [1] | 1,752,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_CentralStatesSoutheastAndSouthwestAreasPensionFundMember | [1] | 1,834,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_CentralStatesSoutheastAndSouthwestAreasPensionFundMember | [1]
Surcharge Imposed | No | [1] |  |  |  |
Expiration Dates of Collective Bargaining Agreements, First | Jan. 31, 2015 |  |  |  |  |
Expiration Dates of Collective Bargaining Agreements, Last | Dec. 31, 2016 |  |  |  |  |
United Food and Commercial Workers Local One Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
EIN/Pension Plan Number | 16-6144007/001 | [2] |  |  |  |
Pension Protection Act Zone Status | Red | [2] | Red | [2] |  |
FIP / RP Status Pending / Implemented | Implemented | [2] |  |  |  |
Contributions | 136,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_UnitedFoodAndCommercialWorkersLocalOnePensionFundMember | [2] | 123,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_UnitedFoodAndCommercialWorkersLocalOnePensionFundMember | [2] | 120,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_UnitedFoodAndCommercialWorkersLocalOnePensionFundMember | [2]
Surcharge Imposed | No | [2] |  |  |  |
Expiration Dates of Collective Bargaining Agreements, First | Feb. 15, 2015 |  |  |  |  |
Pension Fund All Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions | $ 4,340,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_PensionFundAllOtherMember |  | $ 4,287,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_PensionFundAllOtherMember |  | $ 4,444,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = slgn_PensionFundAllOtherMember |
Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multi Employer Plans Status Funded Percentage | 65.00%slgn_MultiEmployerPlansStatusFundedPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
[1] | The applicable collective bargaining agreements related to this pension fund expire between January 31, 2015 and December 31, 2016.
[2] | The collective bargaining agreement related to this pension fund expires on February 15, 2015.

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- Definition Multi employer Plans Status Funded Percentage + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire last in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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