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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 448,308	$ 406,387	$ 1,332,427	$ 1,202,207
Income (loss) from operations	88,459	71,895	266,414	233,001
Interest expense, net	(6,935)	(7,066)	(21,695)	(19,645)
Income before provision for income taxes	81,524	64,829	244,719	213,356
Provision for income taxes	25,072	20,600	75,036	65,611
Net income	56,452	44,229	169,683	147,745
Less: Net (loss) income attributable to noncontrolling interest	(3)	6	7	16
Net income attributable to IDEXX Laboratories, Inc. stockholders	56,455	44,223	169,676	147,729
Depreciation and amortization			57,977	51,227
Expenditures for long-lived assets			49,956	67,517
CAG Segment [Member]
Segment Reporting Information [Line Items]
Revenue	385,288	344,081	1,143,150	1,020,232
Income (loss) from operations	77,493	61,483	229,858	183,086
Water Segment [Member]
Segment Reporting Information [Line Items]
Revenue	27,862	25,957	79,243	72,706
Income (loss) from operations	12,442	12,642	34,864	33,954
LPD Segment [Member]
Segment Reporting Information [Line Items]
Revenue	29,799	30,448	93,511	93,777
Income (loss) from operations	3,026	6,061	12,665	19,596
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenue	5,359	5,901	16,523	15,492
Income (loss) from operations	1,008	569	(749)	(686)
Unallocated Amounts [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (5,510)	$ (8,860)	$ (10,224)	$ (2,949)

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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