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Derivative Instruments And Hedging (Narrative) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Estimated net amount of gains expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months | $ 7,400,000 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |
General duration of foreign currency exchange contracts | 2 years |
Credit Facility borrowings hedged | 80,000,000 us-gaap_DerivativeAmountOfHedgedItem |
Notional Amount of Foreign Currency Exchange Contracts | 186,700,000 invest_DerivativeNotionalAmount | 168,300,000 invest_DerivativeNotionalAmount
Interest Rate Swap Effective On March 30, 2012 [Member] |  |
Derivative [Line Items] |  |
Fixed portion of interest rate associated with interest rate swap | 1.36%us-gaap_DerivativeFixedInterestRate / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTwelveMember |
Credit Facility borrowings hedged | 40,000,000 us-gaap_DerivativeAmountOfHedgedItem / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTwelveMember |
Interest Rate Swap Effective On March 30, 2010 [Member] |  |
Derivative [Line Items] |  |
Fixed portion of interest rate associated with interest rate swap | 2.00%us-gaap_DerivativeFixedInterestRate / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTenMember |
Credit Facility borrowings hedged | 80,000,000 us-gaap_DerivativeAmountOfHedgedItem / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTenMember |
Interest Rate Swap Effective On March 28, 2013 [Member] |  |
Derivative [Line Items] |  |
Fixed portion of interest rate associated with interest rate swap | 1.64%us-gaap_DerivativeFixedInterestRate / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchTwentyEightTwoThousandThirteenMember |
Credit Facility borrowings hedged | $ 40,000,000 us-gaap_DerivativeAmountOfHedgedItem / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchTwentyEightTwoThousandThirteenMember |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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