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Segment Reporting (Summary Of Revenue By Product And Service Category) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Revenue $ 382,477us-gaap_SalesRevenueNet $ 360,203us-gaap_SalesRevenueNet
CAG Diagnostics Recurring Revenue [Member]    
Segment Reporting Information [Line Items]    
Revenue 278,766us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CagDiagnosticsRecurringRevenueMember
255,865us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CagDiagnosticsRecurringRevenueMember
IDEXX VetLab Consumables [Member]    
Segment Reporting Information [Line Items]    
Revenue 98,392us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_VetlabConsumablesMember
84,321us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_VetlabConsumablesMember
VetLab Service and Accessories [Member]    
Segment Reporting Information [Line Items]    
Revenue 13,530us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_VetlabServiceAndAccessoriesMember
13,055us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_VetlabServiceAndAccessoriesMember
Rapid Assay Products [Member]    
Segment Reporting Information [Line Items]    
Revenue 43,637us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_RapidAssayProductsMember
43,059us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_RapidAssayProductsMember
Reference Laboratory Diagnostic And Consulting Services [Member]    
Segment Reporting Information [Line Items]    
Revenue 123,207us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_ReferenceLaboratoryDiagnosticAndConsultingServicesMember
115,430us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_ReferenceLaboratoryDiagnosticAndConsultingServicesMember
CAG Diagnostics Capital - Instruments [Member]    
Segment Reporting Information [Line Items]    
Revenue 20,113us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CagDiagnosticCaptailVetlabInstrumentsMember
18,603us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CagDiagnosticCaptailVetlabInstrumentsMember
Customer Information Managment and Digital Imaging Systems [Member]    
Segment Reporting Information [Line Items]    
Revenue 25,652us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CustomerInformationManagmentAndDigitalImagingSystemsMember
24,260us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= idxx_CustomerInformationManagmentAndDigitalImagingSystemsMember
CAG Segment [Member]    
Segment Reporting Information [Line Items]    
Revenue 324,531us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_CagSegmentMember
298,728us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_CagSegmentMember
Water Segment [Member]    
Segment Reporting Information [Line Items]    
Revenue 21,698us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_WaterSegmentMember
21,421us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_WaterSegmentMember
LPD Segment [Member]    
Segment Reporting Information [Line Items]    
Revenue 31,270us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_LpdSegmentMember
34,211us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_LpdSegmentMember
Other Segment [Member]    
Segment Reporting Information [Line Items]    
Revenue $ 4,978us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_OtherSegmentMember
$ 5,843us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idxx_OtherSegmentMember