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Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting 50.00%ssd_PercentageOfInterestHeldForEquityMethodInvestmentsHighEndOfRange  
Allowance for Doubtful Accounts    
Percentage reserved for accounts receivable due from customers in deteriorating financial condition 100.00%ssd_AccountsReceivableCustomersInBankruptcyOrDeterioratingFinancialConditionPercentageReservedAsUncollectible  
Fair Value of Financial Instruments    
United States Treasury securities and money market funds included in cash equivalents $ 99,024,000ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure $ 117,571,000ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure
Minimum | Software    
Depreciation and Amortization    
Estimated useful life 3 years  
Minimum | Machinery and equipment    
Depreciation and Amortization    
Estimated useful life 3 years  
Minimum | Buildings and site improvements    
Depreciation and Amortization    
Estimated useful life 15 years  
Maximum    
Revenue Recognition    
Service sales as a percentage of net sales 1.00%ssd_ServiceSalesPercentageOfNetSales
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum | Software    
Depreciation and Amortization    
Estimated useful life 5 years  
Maximum | Machinery and equipment    
Depreciation and Amortization    
Estimated useful life 10 years  
Maximum | Buildings and site improvements    
Depreciation and Amortization    
Estimated useful life 45 years  
Bierbach GmbH And Co. KG    
Revenue Recognition    
Contingent consideration from business acquisition $ 200,000us-gaap_BusinessCombinationContingentConsiderationAsset
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCo.KGMember
$ 800,000us-gaap_BusinessCombinationContingentConsiderationAsset
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCo.KGMember