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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds	$ 256,500,000		$ 238,900,000
Goodwill measurement period	1 year
Cumulative effect on retained earnings	$ 243,981,000	$ (99,000)
Undiscounted minimum commitments under noncancelable operating leases	77,578,000
Goodwill	909,691,000		$ 909,691,000
ACI On Premise [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	725,900,000
ACI On Demand [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	$ 183,800,000
Minimum [Member] | Internal-Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Maximum [Member] | Internal-Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	10 years
Accounting Standards Update 2014-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect on retained earnings	$ 244,000,000
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Undiscounted minimum commitments under noncancelable operating leases	$ 77,600,000
Expected operating lease liability and ROU asset ranges, description	Based on currently available information, the Company expects to recognize operating lease liabilities and ROU assets of $65 million – $75 million and $60 million – $70 million, respectively
Accounting Standards Update 2016-02 [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected operating lease liability	$ 65,000,000
Expected right-of-use asset (ROU)	60,000,000
Accounting Standards Update 2016-02 [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected operating lease liability	75,000,000
Expected right-of-use asset (ROU)	$ 70,000,000
Other Intangible Assets [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Other Intangible Assets [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	20 years
Level 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Stated interest rate of Senior Notes	5.75%		6.375%
Level 2 [Member] | Senior Notes [Member] | 5.750% Senior Notes due 2026 [Member]
Summary Of Significant Accounting Policies [Line Items]
Fair value of long-term debt	$ 395,000,000
Level 2 [Member] | Senior Notes [Member] | 6.375% Senior Note due 2020 [Member]
Summary Of Significant Accounting Policies [Line Items]
Fair value of long-term debt			$ 305,700,000

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