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

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- Definition Total anticipated costs associated with remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal, or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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