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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of receivables as of December 31, 2017, 2016 |  | No customer accounted for more than 10% of the Company's consolidated receivables balance as of December 31, 2017 or 2016. |
Amount of off balance sheet settlement funds |  | $ 238,900,000 | $ 270,000,000
Goodwill measurement period |  | 1 year |
Goodwill |  | $ 909,691,000 | 909,691,000
Goodwill impairment |  | $ 0 |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life |  | 3 years |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life |  | 20 years |
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 |
Adjustments for New Accounting Pronouncement [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings, net of tax |  | $ 273,000,000 |
Scenario, Forecast [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings, net of tax | $ 291,000,000 |  |
Software Acquired or Developed for Internal Use [Member] | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life |  | 3 years |
Software Acquired or Developed for Internal Use [Member] | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life |  | 10 years |
Level 2 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value senior note |  | $ 305,700,000 | $ 309,800,000

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 + Details
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