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IDEXX Retirement And Incentive Savings Plan (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
401(k) Plan [Member]      
Retirement And Incentive Savings Plan [Line Items]      
Employer contributions $ 8.8us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember		 $ 7.8us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember		 $ 7.1us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember
Discretionary contributions 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember		 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember		 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_FourZeroOneKPlanMember
European And Canadian Based Defined Contribution Plan [Member]      
Retirement And Incentive Savings Plan [Line Items]      
Employer contributions $ 3.7us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_EuropeanAndCanadianBasedDefinedContributionPlanMember		 $ 3.1us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_EuropeanAndCanadianBasedDefinedContributionPlanMember		 $ 2.8us-gaap_DefinedContributionPlanCostRecognized
/ idxx_RetirementAndIncentiveSavingsPlanAxis
= idxx_EuropeanAndCanadianBasedDefinedContributionPlanMember