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Goodwill and Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Carrying amount of goodwill by reportable segment      
Goodwill $ 122,923us-gaap_Goodwill $ 123,881us-gaap_Goodwill $ 129,433us-gaap_Goodwill
North America      
Carrying amount of goodwill by reportable segment      
Goodwill 84,216us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember		 84,526us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember		 84,690us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
Europe      
Carrying amount of goodwill by reportable segment      
Goodwill 37,256us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember		 37,788us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember		 42,982us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
Asia/Pacific      
Carrying amount of goodwill by reportable segment      
Goodwill $ 1,451us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_AsiaPacificSegmentMember		 $ 1,567us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_AsiaPacificSegmentMember		 $ 1,761us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_AsiaPacificSegmentMember