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Segment Reporting (Summary Of Segment Performance) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 390,122 $ 352,583 $ 750,325 $ 684,688
Income (loss) from operations 83,219 78,763 153,265 139,949
Interest expense, net (2,477) (735) (4,780) (1,125)
Income before provision for income taxes 80,742 78,028 148,485 138,824
Provision for income taxes 23,498 24,029 44,648 39,959
Net income 57,244 53,999 103,837 98,865
Less: Net income attributable to noncontrolling interest 26 4 34 11
Net income attributable to IDEXX Laboratories, Inc. stockholders 57,218 53,995 103,803 98,854
Depreciation and amortization     28,089 27,357
Expenditures for long-lived assets     25,410 46,181
CAG Segment [Member]
        
Segment Reporting Information [Line Items]        
Revenue 326,697 295,834 628,285 572,774
Income (loss) from operations 70,348 63,358 126,212 114,666
Water Segment [Member]
        
Segment Reporting Information [Line Items]        
Revenue 24,487 22,384 45,908 43,050
Income (loss) from operations 10,064 9,913 18,180 18,268
LPD Segment [Member]
        
Segment Reporting Information [Line Items]        
Revenue 32,739 28,278 64,090 56,317
Income (loss) from operations 7,323 3,215 13,783 8,051
Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Revenue 6,199 6,087 12,042 12,547
Income (loss) from operations (249) 841 340 1,276
Unallocated Amounts [Member]
        
Segment Reporting Information [Line Items]        
Income (loss) from operations $ (4,267) $ 1,436 $ (5,250) $ (2,312)