CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 712,019	$ 581,113	$ 2,050,002	$ 1,736,824
Cost of sales	400,450	329,613	1,139,738	978,568
Gross profit	311,569	251,500	910,264	758,256
Selling, general and administrative expenses	147,180	117,370	426,708	369,750
Restructuring expenses and asset impairments	3,204	2,917	8,568	6,758
Operating income	161,185	131,213	474,988	381,748
Other expense (income) - net	630	(704)	16,957	7,321
Interest expense	9,498	10,642	31,479	33,958
Income before income taxes	151,057	121,275	426,552	340,469
Provision for income taxes	35,343	17,427	95,987	63,759
Net income	115,714	103,848	330,565	276,710
Net loss attributable to noncontrolling interest	28	0	80	0
Net income attributable to IDEX	$ 115,742	$ 103,848	$ 330,645	$ 276,710
Earnings per common share:
Basic earnings per common share attributable to IDEX (in dollars per share)	$ 1.52	$ 1.38	$ 4.35	$ 3.66
Diluted earnings per common share attributable to IDEX (in dollars per share)	$ 1.51	$ 1.37	$ 4.33	$ 3.64
Share data:
Basic weighted average common shares outstanding (in shares)	76,010	75,352	75,957	75,423
Diluted weighted average common shares outstanding (in shares)	76,452	75,960	76,408	76,119