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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales and long-lived assets by geographical area
Net Sales	$ 166,630us-gaap_SalesRevenueNet	$ 209,320us-gaap_SalesRevenueNet	$ 207,893us-gaap_SalesRevenueNet	$ 168,305us-gaap_SalesRevenueNet	$ 160,074us-gaap_SalesRevenueNet	$ 195,619us-gaap_SalesRevenueNet	$ 195,348us-gaap_SalesRevenueNet	$ 154,281us-gaap_SalesRevenueNet	$ 752,148us-gaap_SalesRevenueNet	$ 705,322us-gaap_SalesRevenueNet	$ 656,231us-gaap_SalesRevenueNet
Long-Lived Assets	210,775us-gaap_NoncurrentAssets				212,122us-gaap_NoncurrentAssets				210,775us-gaap_NoncurrentAssets	212,122us-gaap_NoncurrentAssets	216,662us-gaap_NoncurrentAssets
Largest customer | Net sales
Net sales and long-lived assets by geographical area
Percentage of net sales attributable to largest customer										10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Wood Construction
Net sales and long-lived assets by geographical area
Net Sales									636,003us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_WoodConstructionMember	596,837us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_WoodConstructionMember	558,103us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_WoodConstructionMember
Concrete Construction
Net sales and long-lived assets by geographical area
Net Sales									115,921us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_ConcreteConstructionMember	108,295us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_ConcreteConstructionMember	97,921us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_ConcreteConstructionMember
Other
Net sales and long-lived assets by geographical area
Net Sales									224us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_OtherProductsMember	190us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_OtherProductsMember	207us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = ssd_OtherProductsMember
United States
Net sales and long-lived assets by geographical area
Net Sales									572,112us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	531,019us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	478,441us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Long-Lived Assets	158,161us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				152,644us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				158,161us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	152,644us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	152,456us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Canada
Net sales and long-lived assets by geographical area
Net Sales									40,996us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	41,626us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	44,359us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Long-Lived Assets	5,195us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA				5,763us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA				5,195us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	5,763us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	6,182us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA
Denmark
Net sales and long-lived assets by geographical area
Net Sales									15,121us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DK	14,993us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DK	15,096us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DK
Long-Lived Assets	1,518us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DK				1,907us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DK				1,518us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DK	1,907us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DK	2,252us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DK
United Kingdom
Net sales and long-lived assets by geographical area
Net Sales									24,893us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	21,852us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	23,504us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Long-Lived Assets	1,377us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB				1,249us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB				1,377us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	1,249us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	1,232us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB
France
Net sales and long-lived assets by geographical area
Net Sales									37,312us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR	36,708us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR	37,826us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR
Long-Lived Assets	8,145us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR				9,302us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR				8,145us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR	9,302us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR	10,036us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR
Germany
Net sales and long-lived assets by geographical area
Net Sales									27,202us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE	26,058us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE	27,919us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE
Long-Lived Assets	15,379us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE				17,446us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE				15,379us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE	17,446us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE	17,651us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE
Switzerland
Net sales and long-lived assets by geographical area
Net Sales									4,960us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH	5,977us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH	6,607us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH
Long-Lived Assets	9,506us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CH				11,649us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CH				9,506us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CH	11,649us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CH	11,628us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CH
Poland
Net sales and long-lived assets by geographical area
Net Sales									7,491us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PL	5,982us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PL	4,847us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PL
Long-Lived Assets	1,071us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL				692us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL				1,071us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL	692us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL	795us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL
The Netherlands
Net sales and long-lived assets by geographical area
Net Sales									4,539us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL	4,306us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL	3,336us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL
Long-Lived Assets	30us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NL				63us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NL				30us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NL	63us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NL	92us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NL
Portugal
Net sales and long-lived assets by geographical area
Net Sales									806us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PT	804us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PT	1,437us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_PT
Long-Lived Assets	472us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PT				688us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PT				472us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PT	688us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PT	734us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PT
Ireland
Net sales and long-lived assets by geographical area
Net Sales									0us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IE	31us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IE	791us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IE
Long-Lived Assets	0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE				0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE				0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE	0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE	2,757us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE
China/Hong Kong
Net sales and long-lived assets by geographical area
Net Sales									9,646us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember	9,802us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember	6,054us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember
Long-Lived Assets	8,966us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember				9,499us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember				8,966us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember	9,499us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember	9,675us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_CNAndHKMember
Australia
Net sales and long-lived assets by geographical area
Net Sales									3,245us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU	3,289us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU	3,386us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU
Long-Lived Assets	267us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU				356us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU				267us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU	356us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU	441us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU
New Zealand
Net sales and long-lived assets by geographical area
Net Sales									2,237us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NZ	1,701us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NZ	1,404us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NZ
Long-Lived Assets	82us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NZ				125us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NZ				82us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NZ	125us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NZ	154us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_NZ
Other countries
Net sales and long-lived assets by geographical area
Net Sales									1,588us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember	1,174us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember	1,224us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember
Long-Lived Assets	$ 606us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember				$ 739us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember				$ 606us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember	$ 739us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember	$ 577us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ssd_OtherCountriesMember

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