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Segment Reporting (Summary Of Segment Performance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 406,387	$ 383,523	$ 1,202,207	$ 1,133,848
Income (loss) from operations	71,895	72,189	233,001	225,454
Interest expense, net	(7,066)	(3,981)	(19,645)	(8,761)
Income before provision for income taxes	64,829	68,208	213,356	216,693
Provision for income taxes	20,600	16,045	65,611	60,693
Net income	44,229	52,163	147,745	156,000
Less: Net loss attributable to noncontrolling interest	6	21	16	55
Net income attributable to IDEXX Laboratories, Inc. stockholders	44,223	52,142	147,729	155,945
CAG Segment [Member]
Segment Reporting Information [Line Items]
Revenue	344,081	317,309	1,020,232	938,166
Income (loss) from operations	61,541	60,176	181,845	181,104
Water Segment [Member]
Segment Reporting Information [Line Items]
Revenue	25,957	25,747	72,706	71,655
Income (loss) from operations	12,408	11,367	33,821	29,547
LPD Segment [Member]
Segment Reporting Information [Line Items]
Revenue	30,448	33,063	93,777	104,581
Income (loss) from operations	5,562	6,319	17,408	25,385
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenue	5,901	7,404	15,492	19,446
Income (loss) from operations	635	794	204	1,134
Unallocated Amounts [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (8,251)	$ (6,467)	$ (277)	$ (11,716)

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