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v2.4.0.8

Commitments and Contingencies - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2013
Schedule of Operating Leases [Line Items] |
Operating leases expiration date | Jul. 31, 2017
Newly Leased Office Space |
Schedule of Operating Leases [Line Items] |
Operating leases expiration date | Apr. 30, 2018

X
- Details
Name: | aciw_ScheduleOfOperatingLeasesLineItems
Namespace Prefix: | aciw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration