Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 23, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	IEX
Entity Registrant Name	IDEX CORP /DE/
Entity Central Index Key	0000832101
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		77,392,051