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Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 245,525	$ 225,735	$ 689,830	$ 697,796
Long lived assets
Long lived assets	1,542,810		1,542,810		$ 1,373,069
Bill Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	64,134	62,328	204,673	201,259
Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,826	24,958	58,060	69,889
Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24,268	18,881	60,899	55,991
Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,327	22,079	60,235	56,459
Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24,244	12,265	54,560	37,613
Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	97,726	85,224	251,403	276,585
ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	141,006	126,006	367,431	385,108
ACI On Premise [Member] | Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	7,499	13,403	27,779	36,118
ACI On Premise [Member] | Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	6,216	6,423	16,476	20,175
ACI On Premise [Member] | Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	7,259	10,887	25,711	22,855
ACI On Premise [Member] | Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	23,704	11,745	53,086	35,195
ACI On Premise [Member] | Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	96,328	83,548	244,379	270,765
ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	104,519	99,729	322,399	312,688
ACI On Demand [Member] | Bill Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	64,134	62,328	204,673	201,259
ACI On Demand [Member] | Digital Channels/Online [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	9,327	11,555	30,281	33,771
ACI On Demand [Member] | Merchant Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,052	12,458	44,423	35,816
ACI On Demand [Member] | Payments Risk Management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	11,068	11,192	34,524	33,604
ACI On Demand [Member] | Real Time Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	540	520	1,474	2,418
ACI On Demand [Member] | Retail Payments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,398	1,676	7,024	5,820
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	114,423	120,858	357,451	386,436
Long lived assets
Long lived assets	834,386		834,386		759,513
United States [Member] | ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,022	36,189	82,280	118,311
United States [Member] | ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	88,401	84,669	275,171	268,125
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	19,118	19,188	52,346	51,759
Long lived assets
Long lived assets	708,424		708,424		$ 613,556
Other [Member] | ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,709	16,874	45,269	44,591
Other [Member] | ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,409	2,314	7,077	7,168
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	93,123	60,023	218,732	201,933
EMEA [Member] | ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	80,738	47,919	181,913	166,379
EMEA [Member] | ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,385	12,104	36,819	35,554
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,861	25,666	61,301	57,668
Asia Pacific [Member] | ACI On Premise [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17,537	25,024	57,969	55,827
Asia Pacific [Member] | ACI On Demand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,324	$ 642	$ 3,332	$ 1,841

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