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Quarterly Financial Information (Unaudited) (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Business Acquisition [Line Items]              
Increase Decrease In Operating Income Nonrecurring     $ 1.8ldl_IncreaseDecreaseInOperatingIncomeNonrecurring        
Increase Decrease In Operating Income By Discrete Tax Benefits   0.3ldl_IncreaseDecreaseInOperatingIncomeByDiscreteTaxBenefits 0.5ldl_IncreaseDecreaseInOperatingIncomeByDiscreteTaxBenefits        
Impact On Net Income Due To Reversal Of Valuation Allowances 0.9ldl_ImpactOnNetIncomeDueToReversalOfValuationAllowances            
Industrial Filtration [Member]              
Business Acquisition [Line Items]              
Purchase accounting adjustment to gross profit       (0.2)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGrossProfit
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
(0.5)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGrossProfit
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
(1.3)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGrossProfit
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
 
Purchase accounting adjustment to net income       (0.2)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
(0.4)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
(0.9)ldl_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
 
Transaction related costs 0.7us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
        2.2us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= ldl_IndustrialFiltrationMember
 
United States Pension Plan of US Entity, Defined Benefit [Member]              
Business Acquisition [Line Items]              
Defined Benefit Plan, Non-Cash Plan Settlement Charge       3.0ldl_DefinedBenefitPlanNonCashPlanSettlementCharge
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
     
Thermalacoustical Metals Segment [Member]              
Business Acquisition [Line Items]              
Commission Settlement Charge         $ 2.0ldl_CommissionSettlementCharge
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_ThermalacousticalMetalsSegmentMember
  $ 2.9ldl_CommissionSettlementCharge
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_ThermalacousticalMetalsSegmentMember