Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands						3 Months Ended									12 Months Ended
	Dec. 31, 2015 USD ($)	Nov. 04, 2015 USD ($)	Aug. 12, 2014 USD ($)	Nov. 05, 2013 USD ($) $ / shares	Mar. 11, 2013 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) Entity shares
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%					100.00%									100.00%
Additional borrowing															$ 298,000	$ 169,500	$ 40,000
Acquisition related transaction expenses																2,700
Operating income (loss)						$ 73,973	$ 23,886	$ 23,664	$ 6,425	$ 79,271	$ 31,869	$ 26,741	$ 291		127,948	138,172	123,048
Goodwill	$ 913,261					913,261				$ 781,163					$ 913,261	$ 781,163	$ 669,217
Restricted share awards (RSAs) [Member]
Business Acquisition [Line Items]
Issuance of ACI common stock | shares															125,026	106,275	25,989
Awards granted requisite service period															3 years	3 years	3 years
New Senior Secured Credit Facilities
Business Acquisition [Line Items]
Additional borrowings under credit facility															$ 300,000
General and Administrative
Business Acquisition [Line Items]
Acquisition related transaction expenses															$ 900
Maximum | Restricted share awards (RSAs) [Member]
Business Acquisition [Line Items]
Awards granted requisite service period															4 years
Revolving Credit Facility
Business Acquisition [Line Items]
Additional borrowing	181,000		$ 60,500
Term Credit Facility [Member]
Business Acquisition [Line Items]
Additional borrowing			150,000
PAY.ON
Business Acquisition [Line Items]
Total purchase price		$ 186,373													$ 186,373
Revenue															2,900
Operating income (loss)															2,100
Business acquisition cash paid															180,994
Goodwill	140,015					140,015									$ 140,015
PAY.ON | Restricted share awards (RSAs) [Member]
Business Acquisition [Line Items]
Issuance of ACI common stock | shares															476,750
Fair value of shares on grant date	11,300					11,300									$ 11,300
Awards granted requisite service period															2 years
Percentage of award vesting increment for every six month															25.00%
PAY.ON | Customer relationships
Business Acquisition [Line Items]
Amortizable intangible assets	22,418					22,418									$ 22,418
Retail Decisions [Member]
Business Acquisition [Line Items]
Revenue															42,700	$ 17,900
Operating income (loss)															6,800	1,900
Business acquisition cash paid			$ 205,100
Goodwill	137,915					137,915									137,915
Retail Decisions [Member] | Customer relationships
Business Acquisition [Line Items]
Amortizable intangible assets	50,480					50,480									50,480
Twenty Thirteen Acquisitions
Business Acquisition [Line Items]
Total purchase price																	$ 378,100
Number of businesses acquired | Entity																	3
Official Payments Holdings, Inc.
Business Acquisition [Line Items]
Additional borrowing				$ 40,000
Acquisition related transaction expenses																	$ 1,200
Revenue																135,700	23,300
Business acquisition cash paid				$ 139,800
Cash paid per common stock | $ / shares				$ 8.35
Goodwill	29,236					29,236									29,236		29,200
Official Payments Holdings, Inc. | Customer relationships
Business Acquisition [Line Items]
Amortizable intangible assets	47,400					47,400									47,400		47,400
Official Payments Holdings, Inc. | Maximum
Business Acquisition [Line Items]
Operating income (loss)																	100
Online Resources Corporation
Business Acquisition [Line Items]
Total purchase price					$ 260,100
Acquisition related transaction expenses																	5,400
Revenue																$ 151,300	120,800
Operating income (loss)																	$ 6,400
Cash paid per common stock | $ / shares					$ 3.85
Goodwill	122,247					122,247									122,247
Business acquisition common stock purchase price					$ 132,900
Online Resources Corporation | Customer relationships
Business Acquisition [Line Items]
Amortizable intangible assets	68,750					68,750									68,750
Online Resources Corporation | Series A-1 Convertible Preferred Stock
Business Acquisition [Line Items]
Business acquisition preferred stock purchase price					$ 127,200
Profesionales en Transacciones Electronicas S.A. - Venezuela ("PTESA-V")
Business Acquisition [Line Items]
Percentage of ownership interest acquired														100.00%
Profesionales en Transacciones Electronicas S.A. - Ecuador ("PTESA-E")
Business Acquisition [Line Items]
Percentage of ownership interest acquired														100.00%
Profesionales En Transacciones Electronicas Venezuela And Ecuador
Business Acquisition [Line Items]
Total purchase price														$ 2,800
Profesionales en Transacciones Electronicas S.A. - Colombia ("PTESA-C")
Business Acquisition [Line Items]
Total purchase price														11,400
Profesionales en Transacciones Electronicas S.A
Business Acquisition [Line Items]
Total purchase price														14,200
Goodwill	7,113					7,113									7,113
Purchase price, non tax deductible goodwill amount														$ 1,500
Profesionales en Transacciones Electronicas S.A | Customer relationships
Business Acquisition [Line Items]
Amortizable intangible assets	$ 7,732					$ 7,732									$ 7,732