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Commitments and Contingencies Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments And Contingencies Disclosure [Line Items]      
Total rental expense $ 1,800,000us-gaap_LeaseAndRentalExpense $ 2,200,000us-gaap_LeaseAndRentalExpense $ 2,500,000us-gaap_LeaseAndRentalExpense
Total future minimum operating lease payments 15,803,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Future Minimum Payments Receivable 800,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable    
Property, plant and equipment, gross 82,532,000us-gaap_PropertyPlantAndEquipmentGross 98,691,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation and amortization 40,944,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 39,717,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
EnvironmentalMonitoringPeriod 10 years    
Total future minimum lease payments of McCook facility 9,984,000us-gaap_MinimumLeasePaymentsSaleLeasebackTransactions    
Applicability and Impact of Environmental Laws 300,000us-gaap_AccrualForEnvironmentalLossContingencies    
Proposed income tax adjustment 1,300,000laws_Proposedincometaxadjustment    
Headquarters      
Commitments And Contingencies Disclosure [Line Items]      
Total future minimum operating lease payments 9,600,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= laws_HeadquartersMember		    
McCook facility      
Commitments And Contingencies Disclosure [Line Items]      
Property, plant and equipment, gross 12,961,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= laws_MccookFacilityMember		 12,961,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= laws_MccookFacilityMember		  
Accumulated depreciation and amortization   3,300,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= laws_MccookFacilityMember		  
Non Cash Increases in Assets and Liabilities     8,000,000laws_NonCashIncreasesInAssetsAndLiabilities
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= laws_MccookFacilityMember
Capital leases      
Commitments And Contingencies Disclosure [Line Items]      
Property, plant and equipment, gross 302,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		 1,007,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		  
Accumulated depreciation and amortization   200,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		  
Capitalizable [Domain]      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost 300,000us-gaap_EnvironmentalExitCostsAnticipatedCost
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= laws_CapitalizableDomain		    
Minimum      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost 300,000us-gaap_EnvironmentalExitCostsAnticipatedCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost $ 1,400,000us-gaap_EnvironmentalExitCostsAnticipatedCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember