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Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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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 |  |

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