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

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