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Revenue Recognition (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax | $ 537,656 | $ 462,021
CAG Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 470,833 | 403,227
CAG Segment [Member] | CAG Diagnostics Recurring Revenue [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 406,048 | 346,680
CAG Segment [Member] | IDEXX Vetlab Consumables [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 149,513 | 123,553
CAG Segment [Member] | Rapid Assay Products [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 52,017 | 47,895
CAG Segment [Member] | Reference Laboratory Diagnostic And Consulting Services [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 186,937 | 159,069
CAG Segment [Member] | CAG Diagnostics Service And Accessories [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 17,581 | 16,163
CAG Segment [Member] | CAG Diagnostic Capital - Instruments [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 30,895 | 26,183
CAG Segment [Member] | Veterinary Software, Services and Diagnostic Imaging Systems [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 33,890 | 30,364
Water Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 29,143 | 25,077
LPD Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 32,240 | 29,317
Other Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 5,440 | $ 4,400

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