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Property And Equipment, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization expense of property and equipment | $ 48.8 us-gaap_OtherDepreciationAndAmortization | $ 42.8 us-gaap_OtherDepreciationAndAmortization | $ 39.8 us-gaap_OtherDepreciationAndAmortization
New Westbrook Administrative Facility [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Current year additions |  | 19.9 us-gaap_PropertyPlantAndEquipmentAdditions / idxx_AdditionsToPropertyAndEquipmentAxis = idxx_NewWestbrookAdministrativeFacilityMember | 13.9 us-gaap_PropertyPlantAndEquipmentAdditions / idxx_AdditionsToPropertyAndEquipmentAxis = idxx_NewWestbrookAdministrativeFacilityMember
Software Developed For Internal Use [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Current year additions | $ 11.9 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = idxx_SoftwareDevelopedForInternalUseMember | $ 10.9 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = idxx_SoftwareDevelopedForInternalUseMember | $ 12.4 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = idxx_SoftwareDevelopedForInternalUseMember

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- Definition The other noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of tangible and intangible assets over their remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=idxx_SoftwareDevelopedForInternalUseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |