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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]    
Beginning Balance $ 651,049us-gaap_Goodwill $ 510,836us-gaap_Goodwill
Acquisitions 2,615us-gaap_GoodwillAcquiredDuringPeriod 134,776us-gaap_GoodwillAcquiredDuringPeriod
Currency translation (23,402)us-gaap_GoodwillTranslationAdjustments 5,437us-gaap_GoodwillTranslationAdjustments
Ending Balance 630,262us-gaap_Goodwill 651,049us-gaap_Goodwill
Metal Containers [Member]    
Goodwill [Roll Forward]    
Beginning Balance 124,491us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
121,872us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Acquisitions 408us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Currency translation (7,571)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
2,619us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Ending Balance 117,328us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
124,491us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_MetalContainersMember
Closures [Member]    
Goodwill [Roll Forward]    
Beginning Balance 295,863us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
160,597us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Acquisitions 2,207us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
131,041us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Currency translation (14,189)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
4,225us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Ending Balance 283,881us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
295,863us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_ClosuresMember
Plastic Containers [Member]    
Goodwill [Roll Forward]    
Beginning Balance 230,695us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
228,367us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
3,735us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Currency translation (1,642)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
(1,407)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
Ending Balance $ 229,053us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember
$ 230,695us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= slgn_PlasticContainersMember