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Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) (Maximum)	12 Months Ended
	Dec. 31, 2014
Maximum
Goodwill [Line Items]
Preliminary purchase price allocation period	1 year

X

- Definition

Maximum purchase price allocation period.

+ References

No definition available.

+ Details

Name:	aciw_PreliminaryPurchasePriceAllocationPeriod
Namespace Prefix:	aciw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration