Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
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

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.

No definition available.

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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

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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