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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds	$ 199,600		$ 256,500
Goodwill	909,691		909,691
Operating Lease Liability	64,970
Right-of-use Asset (ROU)	60,978
ACI On Premise [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	725,900
ACI On Demand [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	183,800
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating Lease Liability		$ 63,300
Right-of-use Asset (ROU)		$ 68,600
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	$ 409,500		$ 395,000
State interest rate	5.75%

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The balance of the settlement funds at period end. Settlement funds are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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