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Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | $ 234,995 | $ 240,599 | $ 444,305 | $ 472,061 |
Long lived assets |  |  |  |  |
Long lived assets | 1,550,569 |  | 1,550,569 |  | $ 1,373,069
Bill Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 74,371 | 73,685 | 140,539 | 138,931 |
Digital Channels/Online [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 19,227 | 21,952 | 41,234 | 44,931 |
Merchant Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 19,250 | 19,439 | 36,631 | 37,110 |
Payments Risk Management [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 19,690 | 18,912 | 41,908 | 34,380 |
Real Time Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 16,225 | 11,605 | 30,316 | 25,348 |
Retail Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 86,232 | 95,006 | 153,677 | 191,361 |
ACI On Premise [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 121,395 | 127,194 | 226,425 | 259,102 |
ACI On Premise [Member] | Digital Channels/Online [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 8,917 | 10,227 | 20,280 | 22,715 |
ACI On Premise [Member] | Merchant Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 5,250 | 7,440 | 10,260 | 13,752 |
ACI On Premise [Member] | Payments Risk Management [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 8,032 | 6,808 | 18,452 | 11,968 |
ACI On Premise [Member] | Real Time Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 15,741 | 9,902 | 29,382 | 23,450 |
ACI On Premise [Member] | Retail Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 83,455 | 92,817 | 148,051 | 187,217 |
ACI On Demand [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 113,600 | 113,405 | 217,880 | 212,959 |
ACI On Demand [Member] | Bill Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 74,371 | 73,685 | 140,539 | 138,931 |
ACI On Demand [Member] | Digital Channels/Online [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 10,310 | 11,725 | 20,954 | 22,216 |
ACI On Demand [Member] | Merchant Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 14,000 | 11,999 | 26,371 | 23,358 |
ACI On Demand [Member] | Payments Risk Management [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 11,658 | 12,104 | 23,456 | 22,412 |
ACI On Demand [Member] | Real Time Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 484 | 1,703 | 934 | 1,898 |
ACI On Demand [Member] | Retail Payments [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 2,777 | 2,189 | 5,626 | 4,144 |
United States [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 123,219 | 130,576 | 243,028 | 265,578 |
Long lived assets |  |  |  |  |
Long lived assets | 840,614 |  | 840,614 |  | 759,513
United States [Member] | ACI On Premise [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 25,394 | 32,928 | 56,258 | 82,122 |
United States [Member] | ACI On Demand [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 97,825 | 97,648 | 186,770 | 183,456 |
Other [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 14,124 | 15,445 | 33,228 | 32,571 |
Long lived assets |  |  |  |  |
Long lived assets | 709,955 |  | 709,955 |  | $ 613,556
Other [Member] | ACI On Premise [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 11,776 | 12,844 | 28,560 | 27,717 |
Other [Member] | ACI On Demand [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 2,348 | 2,601 | 4,668 | 4,854 |
EMEA [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 74,914 | 78,927 | 125,609 | 141,910 |
EMEA [Member] | ACI On Premise [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 62,489 | 66,556 | 101,175 | 118,460 |
EMEA [Member] | ACI On Demand [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 12,425 | 12,371 | 24,434 | 23,450 |
Asia Pacific [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 22,738 | 15,651 | 42,440 | 32,002 |
Asia Pacific [Member] | ACI On Premise [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 21,736 | 14,866 | 40,432 | 30,803 |
Asia Pacific [Member] | ACI On Demand [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | $ 1,002 | $ 785 | $ 2,008 | $ 1,199 |

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