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Derivative Instruments And Hedging (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |
Estimated net amount of gains that are expected to be reclassified out of accumulated other comprehensive income and into earnings within the next 12 months | $ 11.9 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |
General duration of foreign currency exchange contracts | 24 months |
Notional Amount of Foreign Currency Exchange Contracts | 199.3 invest_DerivativeNotionalAmount | 186.7 invest_DerivativeNotionalAmount
Interest Rate Swap Effective On March 30, 2012 [Member] |  |
Derivative [Line Items] |  |
Credit Facility borrowings hedged | 40 us-gaap_DerivativeAmountOfHedgedItem / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTwelveMember |
Fixed portion of interest rate associated with interest rate swap | 1.36%us-gaap_DerivativeFixedInterestRate / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchThirtyTwoThousandTwelveMember |
Interest Rate Swap Effective On March 28, 2013 [Member] |  |
Derivative [Line Items] |  |
Credit Facility borrowings hedged | $ 40 us-gaap_DerivativeAmountOfHedgedItem / us-gaap_LineOfCreditFacilityAxis = idxx_InterestRateSwapEffectiveOnMarchTwentyEightTwoThousandThirteenMember |
Fixed portion of interest rate associated with interest rate swap | 1.64%us-gaap_DerivativeFixedInterestRate / 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
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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
Name: | us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |