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IDEXX Retirement and Incentive Savings Plan (Details) - 401(k) Plan - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement And Incentive Savings Plan [Line Items] |  |  |
Contribution match, maximum percent of participants' eligible compensation | 5.00% | 4.00% |
Employer contributions | $ 19,000,000 | $ 13,800,000 | $ 12,500,000
Discretionary contributions | $ 0 | $ 0 | $ 0

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- Definition Retirement And Incentive Savings Plan [Line Items] + References No definition available. + Details
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Namespace Prefix: | idxx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
Name: | idxx_RetirementAndIncentiveSavingsPlanAxis=idxx_FourZeroOneKPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |