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Property, Plant and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Property, Plant and Equipment      
Property, plant and equipment, gross $ 431,584us-gaap_PropertyPlantAndEquipmentGross $ 438,490us-gaap_PropertyPlantAndEquipmentGross $ 442,699us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (246,055)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (245,383)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (240,289)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment excluding capital projects in progress, net 185,529ssd_PropertyPlantAndEquipmentExcludingCapitalProjectsInProgress 193,107ssd_PropertyPlantAndEquipmentExcludingCapitalProjectsInProgress 202,410ssd_PropertyPlantAndEquipmentExcludingCapitalProjectsInProgress
Capital projects in progress 19,480us-gaap_ConstructionInProgressGross 13,920us-gaap_ConstructionInProgressGross 5,047us-gaap_ConstructionInProgressGross
Property, plant and equipment, net 205,009us-gaap_PropertyPlantAndEquipmentNet 207,027us-gaap_PropertyPlantAndEquipmentNet 207,457us-gaap_PropertyPlantAndEquipmentNet
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 28,795us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
29,390us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
29,960us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 171,541us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
175,058us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
178,135us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,428us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
5,602us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
5,492us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 225,820us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ssd_MachineryEquipmentAndSoftwareDevelopmentMember
$ 228,440us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ssd_MachineryEquipmentAndSoftwareDevelopmentMember
$ 229,112us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ssd_MachineryEquipmentAndSoftwareDevelopmentMember