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Segment Reporting (Summary of Segment Performance) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]            
Revenue $ 826,142   $ 637,592   $ 1,603,849 $ 1,263,928
Income from operations 259,253   193,248   506,875 337,573
Interest expense, net (7,522)   (9,426)   (15,054) (16,978)
Income before provision for income taxes 251,731   183,822   491,821 320,595
Provision for income taxes 49,125   34,826   84,926 59,743
Net income 202,606 $ 204,289 148,996 $ 111,856 406,895 260,852
Less: Net income attributable to noncontrolling interest 24   56   56 85
Net income attributable to IDEXX Laboratories, Inc. stockholders 202,582   148,940   406,839 260,767
CAG            
Segment Reporting Information [Line Items]            
Revenue 745,595   566,100   1,438,362 1,118,096
Income from operations 234,735   167,969   447,945 286,628
Water            
Segment Reporting Information [Line Items]            
Revenue 37,191   28,116   71,231 62,265
Income from operations 17,228   12,258   32,000 28,140
LPD            
Segment Reporting Information [Line Items]            
Revenue 33,524   32,244   72,794 66,398
Income from operations 6,868   8,249   20,676 17,912
Other            
Segment Reporting Information [Line Items]            
Revenue 9,832   11,132   21,462 17,169
Income from operations $ 422   $ 4,772   $ 6,254 $ 4,893