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Goodwill and Intangible Assets (Additional Information) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Goodwill, Purchase Accounting Adjustments   $ 100,000us-gaap_GoodwillPurchaseAccountingAdjustments  
Contingent consideration as percentage of revenue for acquisition   4.00%ldl_BusinessAcquisitionContingentConsiderationPercentage  
Goodwill 21,943,000us-gaap_Goodwill 18,589,000us-gaap_Goodwill 18,282,000us-gaap_Goodwill
Finite-lived Intangible Assets Acquired 5,600,000us-gaap_FinitelivedIntangibleAssetsAcquired1    
Amortization of Intangible Assets 900,000us-gaap_AmortizationOfIntangibleAssets 400,000us-gaap_AmortizationOfIntangibleAssets 800,000us-gaap_AmortizationOfIntangibleAssets
Finite-Lived Intangible Asset, Useful Life 11 years    
Carrying Values Of Acquisition Related Intangibles 3,400,000ldl_CarryingValuesOfAcquisitionRelatedIntangibles    
Period One [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ ldl_PeriodAxis
= ldl_PeriodOneMember
   
Period Two [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ ldl_PeriodAxis
= ldl_PeriodTwoMember
   
Performance materials segment      
Goodwill [Line Items]      
Goodwill 13,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_PerformanceMaterialsSegmentMember
   
Industrial Filtration [Member]      
Goodwill [Line Items]      
Goodwill 3,943,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_IndustrialFiltrationMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_IndustrialFiltrationMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_IndustrialFiltrationMember
Other Products and Services Segment [Member]      
Goodwill [Line Items]      
Goodwill 4,660,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_OtherProductsAndServicesSegmentMember
4,660,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_OtherProductsAndServicesSegmentMember
 
Other Products and Services Segment [Member] | Life Sciences Vital Fluids [Member]      
Goodwill [Line Items]      
Goodwill 4,700,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ldl_OtherProductsAndServicesSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= ldl_LifeSciencesVitalFluidsMember
   
Solutech [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 9 years    
Other Intangible Assets [Member]      
Goodwill [Line Items]      
Finite-lived Intangible Assets Acquired 600,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
   
Customer Relationships [Member]      
Goodwill [Line Items]      
Finite-lived Intangible Assets Acquired $ 2,500,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Licensing Agreements [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 12 years