Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 06, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	ACIW
Entity Registrant Name	ACI WORLDWIDE, INC.
Entity Central Index Key	0000935036
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		39,543,919