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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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