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

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