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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Goodwill Beginning Balance | $ 650,237 | $ 653,666
Goodwill acquired | 7,750 | 3,943
Purchase price adjustments related to purchase of NWS |  | (7,372)
Goodwill Ending Balance | 657,987 | 650,237
Enterprise Software Solutions |  |
Goodwill [Roll Forward] |  |
Goodwill Beginning Balance | 643,680 | 647,109
Goodwill acquired | 7,750 | 3,943
Purchase price adjustments related to purchase of NWS |  | (7,372)
Goodwill Ending Balance | 651,430 | 643,680
Appraisal and Tax Software Solutions and Services |  |
Goodwill [Roll Forward] |  |
Goodwill Beginning Balance | 6,557 | 6,557
Goodwill acquired | 0 | 0
Purchase price adjustments related to purchase of NWS |  | 0
Goodwill Ending Balance | $ 6,557 | $ 6,557

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- Definition The net effect on income before taxes of the amortization and accretion of premiums, discounts and intangible assets in the year of acquisition, when the assets of the acquired institution exceed 10 percent of the consolidated assets at the end of the most recent period. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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