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Segment Reporting (Summary Of Segment Performance) (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
Income (loss) from operations	72,803us-gaap_OperatingIncomeLoss	70,046us-gaap_OperatingIncomeLoss
Interest expense, net	(5,879)us-gaap_InterestIncomeExpenseNonoperatingNet	(2,303)us-gaap_InterestIncomeExpenseNonoperatingNet
Income before provision for income taxes	66,924us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	67,743us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	20,346us-gaap_IncomeTaxExpenseBenefit	21,150us-gaap_IncomeTaxExpenseBenefit
Net income	46,578us-gaap_ProfitLoss	46,593us-gaap_ProfitLoss
Less: Net loss attributable to noncontrolling interest	(16)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to IDEXX Laboratories, Inc. stockholders	46,594us-gaap_NetIncomeLoss	46,585us-gaap_NetIncomeLoss
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
Income (loss) from operations	52,429us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_CagSegmentMember	54,004us-gaap_OperatingIncomeLoss / 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
Income (loss) from operations	9,459us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_WaterSegmentMember	8,116us-gaap_OperatingIncomeLoss / 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
Income (loss) from operations	5,951us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_LpdSegmentMember	8,320us-gaap_OperatingIncomeLoss / 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
Income (loss) from operations	(194)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_OtherSegmentMember	589us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_OtherSegmentMember
Unallocated Amounts [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 5,158us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_UnallocatedAmountsMember	$ (983)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = idxx_UnallocatedAmountsMember

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