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Debt (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
item
Dec. 31, 2014
Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Note Agreements, aggregate principal amount $ 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior notes payable, consolidated leverage ratio, maximum 3.5idxx_ConsolidatedLeverageRatioUnderSeniorNoteAgreements
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Series A Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior notes payable   75,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= idxx_SeriesSeniorNoteMember
Senior notes payable, stated interest rate   3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= idxx_SeriesSeniorNoteMember
Senior notes payable, term   7 years
Series B Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior notes payable   $ 75,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= idxx_SeriesBSeniorNoteMember
Senior notes payable, stated interest rate   3.72%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= idxx_SeriesBSeniorNoteMember
Senior notes payable, term   12 years