CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 685,947	$ 561,249	$ 1,337,983	$ 1,155,711
Cost of sales	379,875	326,449	739,288	648,955
Gross profit	306,072	234,800	598,695	506,756
Selling, general and administrative expenses	144,680	120,365	279,528	252,380
Restructuring expenses and asset impairments	3,136	3,841	5,364	3,841
Operating income	158,256	110,594	313,803	250,535
Other (income) expense - net	17,175	6,460	16,327	8,025
Interest expense	11,205	12,439	21,981	23,316
Income before income taxes	129,876	91,695	275,495	219,194
Provision for income taxes	27,697	20,831	60,644	46,332
Net income	102,179	70,864	214,851	172,862
Net (income) loss attributable to noncontrolling interest	16	0	52	0
Net income attributable to IDEX	$ 102,195	$ 70,864	$ 214,903	$ 172,862
Earnings per common share:
Basic earnings per common share attributable to IDEX (in dollars per share)	$ 1.34	$ 0.94	$ 2.83	$ 2.29
Diluted earnings per common share attributable to IDEX (in dollars per share)	$ 1.34	$ 0.93	$ 2.81	$ 2.27
Share data:
Basic weighted average common shares outstanding (in shares)	75,968	75,171	75,930	75,459
Diluted weighted average common shares outstanding (in shares)	76,429	75,937	76,385	76,198