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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Provision for income taxes	$ 20,346us-gaap_IncomeTaxExpenseBenefit	$ 21,150us-gaap_IncomeTaxExpenseBenefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,964us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	4,217us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember	196us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember
Provision for income taxes	1,253us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember	47us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,964us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember	149us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember
Foreign Currency Exchange Contracts [Member] | Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	4,479us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_OtherComprehensiveIncomeLocationAxis = idxx_ForeignCurrencyExchangeContractsMember	458us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_OtherComprehensiveIncomeLocationAxis = idxx_ForeignCurrencyExchangeContractsMember
Interest Rate Swaps [Member] | Reclassifications out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (262)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_OtherComprehensiveIncomeLocationAxis = idxx_InterestRateSwapsMember	$ (262)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_IncomeStatementLocationAxis = idxx_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_OtherComprehensiveIncomeLocationAxis = idxx_InterestRateSwapsMember

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

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- Definition

Amount before tax of reclassification adjustments of other comprehensive income (loss).

+ References

No definition available.

+ Details

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

No definition available.

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