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Operations and Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Indefinite-Lived Intangible Assets |  |  |
Intangible assets | $ 2,134,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | $ 5,666,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Indefinite-Lived Intangibles |  |  |
Indefinite-Lived Intangibles, Balance at the beginning of the year | 5,666,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Reclassifications | (3,349,000)ssd_IndefiniteLivedIntangibleAssetsReclassifications | 5,358,000 ssd_IndefiniteLivedIntangibleAssetsReclassifications |
Foreign exchange | (183,000)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments | 308,000 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments |
Indefinite-Lived Intangibles, Balance at the end of the year | 2,134,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 5,666,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Increase in goodwill |  | 1,592,000 us-gaap_GoodwillAcquiredDuringPeriod |
Finite-Lived Intangible Assets, Gross | 58,874,000 us-gaap_FiniteLivedIntangibleAssetsGross | 67,737,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Finite-Lived Intangible Assets, Accumulated Amortization | (26,287,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (25,964,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible Assets, Net (Excluding Goodwill) | 32,587,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 41,773,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
North America |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in goodwill |  | 918,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember |
Finite-Lived Intangible Assets, Gross | 29,455,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember | 34,520,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember |
Finite-Lived Intangible Assets, Accumulated Amortization | (14,719,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember | (15,909,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember |
Intangible Assets, Net (Excluding Goodwill) | 14,736,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember | 18,611,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ssd_NorthAmericaSegmentMember |
Europe |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in goodwill |  | 674,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember |
Finite-Lived Intangible Assets, Gross | 29,419,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember | 33,217,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember |
Finite-Lived Intangible Assets, Accumulated Amortization | (11,568,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember | (10,055,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember |
Intangible Assets, Net (Excluding Goodwill) | 17,851,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember | 23,162,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = ssd_EuropeSegmentMember |
Unpatented Technology |  |  |
Indefinite-Lived Intangibles |  |  |
Reclassification of intangible assets | 3,300,000 us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember |  |
Finite-Lived Intangible Assets, Gross | 22,797,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 18,977,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 5,361,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Finite-Lived Intangible Assets, Accumulated Amortization | (7,665,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | (5,257,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | (2,017,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Intangible Assets, Net (Excluding Goodwill) | 15,132,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 13,720,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 3,344,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Customer Relationships |  |  |
Indefinite-Lived Intangibles |  |  |
Finite-Lived Intangible Assets, Gross | 21,346,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 22,849,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 20,697,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization | (11,671,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (11,164,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (8,699,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible Assets, Net (Excluding Goodwill) | 9,675,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 11,685,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 11,998,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Non-Compete Agreements, Trademarks and Other |  |  |
Indefinite-Lived Intangibles |  |  |
Finite-Lived Intangible Assets, Gross | 10,839,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | 13,555,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | 36,951,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember
Finite-Lived Intangible Assets, Accumulated Amortization | (5,374,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | (3,554,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | (3,002,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember
Intangible Assets, Net (Excluding Goodwill) | 5,465,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | 10,001,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember | 33,949,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember
ShearBrace | Unpatented Technology |  |  |
Indefinite-Lived Intangibles |  |  |
Reclassification of intangible assets | 2,000,000 us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ssd_TJShearBraceMember |  |
Keymark |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in goodwill |  | 5,900,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ssd_KeymarkEnterprisesLLCMember |
Bierbach GmbH And Co. KG | Customer Relationships |  |  |
Indefinite-Lived Intangibles |  |  |
Adjustment to intangible asset from business acquisition | 600,000 us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ssd_BierbachGmbHAndCo.KGMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Bierbach GmbH And Co. KG | Non-Compete Agreements, Trademarks and Other |  |  |
Indefinite-Lived Intangibles |  |  |
Adjustment to intangible asset from business acquisition |  | 500,000 us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ssd_BierbachGmbHAndCo.KGMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ssd_NoncompeteAgreementsTrademarksAndOtherMember |
Bierbach GmbH And Co. KG | Goodwill [Member] |  |  |
Indefinite-Lived Intangibles |  |  |
Adjustment to intangible asset from business acquisition |  | 100,000 us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ssd_BierbachGmbHAndCo.KGMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_GoodwillMember |
S&P Clever |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in intangible assets | 12,800,000 ssd_BusinessCombinationAdjustmentForIncreaseInIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = ssd_SAndPCleverMember |  |
S&P Clever | Customer Relationships |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in intangible assets |  | 1,900,000 ssd_BusinessCombinationAdjustmentForIncreaseInIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = ssd_SAndPCleverMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
CarbonWrap Solutions, L.L.C |  |  |
Indefinite-Lived Intangibles |  |  |
Increase in intangible assets | 1,500,000 ssd_BusinessCombinationAdjustmentForIncreaseInIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = ssd_CarbonWrapSolutionsLLCMember |  |
In Process Research and Development Two [Member] |  |  |
Indefinite-Lived Intangible Assets |  |  |
Intangible assets | 1,500,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ssd_InProcessResearchAndDevelopmentTwoMember |  |
Indefinite-Lived Intangibles |  |  |
Indefinite-Lived Intangibles, Balance at the end of the year | 1,500,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ssd_InProcessResearchAndDevelopmentTwoMember |  |
Trade Name |  |  |
Indefinite-Lived Intangible Assets |  |  |
Intangible assets | 616,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 616,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Indefinite-Lived Intangibles |  |  |
Indefinite-Lived Intangibles, Balance at the beginning of the year | 616,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Reclassifications | 0 ssd_IndefiniteLivedIntangibleAssetsReclassifications / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 616,000 ssd_IndefiniteLivedIntangibleAssetsReclassifications / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Foreign exchange | 0 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 0 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Indefinite-Lived Intangibles, Balance at the end of the year | 616,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 616,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
In-process research and development assets |  |  |
Indefinite-Lived Intangible Assets |  |  |
Intangible assets | 1,518,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 5,050,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Number of indefinite-lived assets | 1 ssd_NumberOfIndefiniteLivedIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |  |
Indefinite-Lived Intangibles |  |  |
Indefinite-Lived Intangibles, Balance at the beginning of the year | 5,050,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Reclassifications | (3,349,000)ssd_IndefiniteLivedIntangibleAssetsReclassifications / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 4,742,000 ssd_IndefiniteLivedIntangibleAssetsReclassifications / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Foreign exchange | (183,000)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 308,000 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Indefinite-Lived Intangibles, Balance at the end of the year | $ 1,518,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | $ 5,050,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |

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