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Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]                  
Assets $ 216,586us-gaap_Assets $ 220,224us-gaap_Assets $ 268,557us-gaap_Assets $ 272,177us-gaap_Assets $ 274,706us-gaap_Assets $ 268,746us-gaap_Assets $ 296,316us-gaap_Assets $ 298,580us-gaap_Assets $ 300,271us-gaap_Assets
Eliminations [Member]                  
Segment Reporting, Asset Reconciling Item [Line Items]                  
Assets (18,580)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		       (17,551)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		        
Radiation Measurement [Member]                  
Segment Reporting, Asset Reconciling Item [Line Items]                  
Assets 148,151us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		       168,592us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_RadiationMeasurementMember		        
Medical Physics [Member]                  
Segment Reporting, Asset Reconciling Item [Line Items]                  
Assets 38,851us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		       41,740us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalPhysicsMember		        
Medical Products [Member]                  
Segment Reporting, Asset Reconciling Item [Line Items]                  
Assets $ 48,164us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember		       $ 81,925us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ldr_MedicalProductsMember