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Reportable Business Segment Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2010 | Dec. 31, 2011 Metal Containers | Dec. 31, 2011 Corporate | Dec. 31, 2010 Closures
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge related to resolution of past product liability dispute | $ 3.3 |  |  |  |  |  | $ 3.3 |  |
Income as result of proceeds received from termination of the Graham Packaging merger agreement net of costs | 27.0 |  |  |  |  |  |  | 25.2 |
Charge included for the remeasurement of net assets |  |  |  |  | 3.2 |  |  |  | 3.2
Costs attributable to announced acquisitions |  | $ 1.8 | $ 2.2 | $ 0.5 |  | $ 2.7 |  |  |

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- Definition Acquisition Related Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Charge for the remeasurement of net assets. + References No definition available. + Details
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Balance Type: | debit
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- Definition Charge Related to Resolution of Past Product Liability Dispute + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating Income Adjustment on Contract Termination + References No definition available. + Details
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Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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