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Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended |  |  |
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Sep. 08, 2014 | Oct. 22, 2013 | Aug. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 630,262,000 us-gaap_Goodwill | $ 651,049,000 us-gaap_Goodwill | $ 510,836,000 us-gaap_Goodwill
Van Can Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for business acquired | 17,300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = slgn_VanCanCompanyMember |  |  |  |  |
Portola Packaging, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for business acquired |  | 262,800,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = slgn_PortolaPackagingIncMember |  |  |  |
Goodwill |  | 125,800,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = slgn_PortolaPackagingIncMember |  |  |  |
Portola Packaging, Inc [Member] | Customer relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, Intangible assets acquired |  | 62,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = slgn_PortolaPackagingIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |
Acquired finite lived intangible assets weighted average useful life |  | 17 years |  |  |  |
Portola Packaging, Inc [Member] | North America and Europe [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Plants Acquired |  | 8 slgn_NumberofPlantsAcquired / us-gaap_BusinessAcquisitionAxis = slgn_PortolaPackagingIncMember / us-gaap_StatementGeographicalAxis = slgn_NorthAmericaandEuropeMember |  |  |  |
Plastic Food Container Operations of Rexam PLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for business acquired |  |  | 250,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = slgn_PlasticFoodContainerOperationsofRexamPLCMember |  |  |
Goodwill |  |  | 113,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = slgn_PlasticFoodContainerOperationsofRexamPLCMember |  |  |
Plastic Food Container Operations of Rexam PLC | Customer Relationships and Technology |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, Intangible assets acquired |  |  | 78,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = slgn_PlasticFoodContainerOperationsofRexamPLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slgn_CustomerRelationshipsAndTechnologyMember |  |  |
Plastic Food Container Operations of Rexam PLC | Customer relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, Intangible assets acquired |  |  | 67,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = slgn_PlasticFoodContainerOperationsofRexamPLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Acquired finite lived intangible assets weighted average useful life |  |  | 18 years |  |  |
Plastic Food Container Operations of Rexam PLC | Technology Know-how |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, Intangible assets acquired |  |  | $ 11,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = slgn_PlasticFoodContainerOperationsofRexamPLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slgn_TechnologyAndKnowHowMember |  |  |
Acquired finite lived intangible assets weighted average useful life |  |  | 8 years |  |  |

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- Definition Number of Plants Acquired + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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