Subsequent Events - Additional Information (Detail) (International Business Machines, USD $) In Millions, unless otherwise specified	1 Months Ended
Apr. 01, 2012
International Business Machines
Subsequent Event [Line Items]
Services agreement, expected termination fee	$ 3.0
Services agreement, effective termination date	2013-01-31

Contractual termination fee to be paid by the Company to International Business Machines for the termination of the outsourcing agreement.

No definition available.

Name:	aciw_OutsourcingAgreementTerminationFee
Namespace Prefix:	aciw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration