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Acquisitions (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
employee
Jan. 31, 2012
Mar. 31, 2012
Feb. 28, 2013
Dec. 31, 2013
Dec. 31, 2014
Nov. 30, 2013
Acquisitions                
Goodwill $ 129,218,000us-gaap_Goodwill $ 121,981,000us-gaap_Goodwill       129,218,000us-gaap_Goodwill $ 123,881,000us-gaap_Goodwill  
CarbonWrap product line                
Acquisitions                
Sale proceeds 3,800,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssd_CarbonWrapSolutionsLLCMember
             
Gain from discontinued operations, before income taxes 1,400,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ssd_CarbonWrapSolutionsLLCMember
             
Keymark | Software development                
Acquisitions                
Intangible assets             3,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ssd_KeymarkEnterprisesLLCMember
 
Weighted-average amortization period   4 years 10 months 24 days            
Amount paid   9,100,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ssd_KeymarkEnterprisesLLCMember
           
Number of employees hired to perform development work   39ssd_SignificantAcquisitionsAndDisposalsNumberOfEmployeesHiredToPerformDevelopmentWork
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ssd_KeymarkEnterprisesLLCMember
           
Europe                
Acquisitions                
Goodwill 42,690,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
41,263,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
      42,690,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
37,788,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
 
North America                
Acquisitions                
Goodwill 84,822,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
78,739,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
      84,822,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
84,526,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
 
North America | Keymark | Software development                
Acquisitions                
Goodwill 5,900,000us-gaap_Goodwill
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ssd_KeymarkEnterprisesLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
        5,900,000us-gaap_Goodwill
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ssd_KeymarkEnterprisesLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
   
S&P Clever                
Acquisitions                
Purchase price     58,100,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Intangible assets     20,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Weighted-average amortization period     9 years 9 months 18 days          
Cash paid for acquisition     57,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Contingent consideration payable     600,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Maximum period for payment of contingent consideration     3 years          
Cash and cash equivalent     6,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Other current assets     10,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Non-current assets     53,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Current liabilities     12,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Non-current liabilities     200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
Long-lived intangibles related to in-progress product development     4,800,000ssd_BusinessAcquisitionPurchasePriceAllocationAmortizableLongLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
         
S&P Clever | Europe                
Acquisitions                
Goodwill     19,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ssd_SAndPCleverMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
         
CarbonWrap Solutions, L.L.C                
Acquisitions                
Purchase price       5,500,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ssd_CarbonWrapSolutionsLLCMember
       
Intangible assets       1,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ssd_CarbonWrapSolutionsLLCMember
       
Cash paid for acquisition       5,300,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ssd_CarbonWrapSolutionsLLCMember
       
Contingent consideration payable       200,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ssd_CarbonWrapSolutionsLLCMember
       
CarbonWrap Solutions, L.L.C | North America                
Acquisitions                
Goodwill       3,500,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ssd_CarbonWrapSolutionsLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
       
ShearBrace                
Acquisitions                
Intangible assets         1,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ssd_TJShearBraceMember
     
Weighted-average amortization period           13 years 4 months 24 days    
Cash paid for acquisition         5,300,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ssd_TJShearBraceMember
     
ShearBrace | North America                
Acquisitions                
Goodwill         2,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ssd_TJShearBraceMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_NorthAmericaSegmentMember
     
Bierbach GmbH and Co KG                
Acquisitions                
Intangible assets               600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
Weighted-average amortization period           9 years 8 months 12 days    
Cash paid for acquisition             1,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
 
Contingent consideration payable             200,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
800,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
Bierbach GmbH and Co KG | Europe                
Acquisitions                
Goodwill               500,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
/ us-gaap_StatementBusinessSegmentsAxis
= ssd_EuropeSegmentMember
General and Administrative Expense [Member] | Bierbach GmbH and Co KG                
Acquisitions                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             $ (500,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= ssd_BierbachGmbHAndCoKGMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember