Redemption Price of Notes Plus Accrued And Unpaid Interest Thereon to The Redemption Date (Detail) (7 1/4% Senior Notes)	Dec. 31, 2011
7 1/4% Senior Notes
Debt Instrument [Line Items]
2013	103.625%
2014	101.813%
2015 and thereafter	100.00%

Percentage Of Debt Instrument Redemption Price In Year Four and Thereafter After August 15 of the Year

No definition available.

Name:	slgn_PercentageOfDebtInstrumentRedemptionPriceInYearFourAndThereafter
Namespace Prefix:	slgn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant