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Business Segment Information - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Segment income | $ 412,100 | $ 356,990 | $ 299,730
Nestle Food Company | Metal Containers [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Percentage of net sales | 10.40% | 10.20% | 11.50%

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- Definition Percentage of Total Revenue + References No definition available. + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
Name: | srt_MajorCustomersAxis=slgn_NestleFoodCompanyMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |