Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill Beginning Balance	$ 653,666	$ 124,142
Goodwill Ending Balance	650,237	653,666
New World Systems Corporation
Goodwill [Line Items]
Goodwill acquired		527,618
Goodwill, purchase price adjustments	(7,372)
Brazos Technology Corporation
Goodwill [Line Items]
Goodwill acquired		1,906
Small Acquisition
Goodwill [Line Items]
Goodwill acquired	3,943
Enterprise Software Solutions
Goodwill [Line Items]
Goodwill Beginning Balance	647,109	117,585
Goodwill Ending Balance	643,680	647,109
Enterprise Software Solutions \| New World Systems Corporation
Goodwill [Line Items]
Goodwill acquired		527,618
Goodwill, purchase price adjustments	(7,372)
Enterprise Software Solutions \| Brazos Technology Corporation
Goodwill [Line Items]
Goodwill acquired		1,906
Enterprise Software Solutions \| Small Acquisition
Goodwill [Line Items]
Goodwill acquired	3,943
Appraisal and Tax Software Solutions and Services
Goodwill [Line Items]
Goodwill Beginning Balance	6,557	6,557
Goodwill Ending Balance	6,557	6,557
Appraisal and Tax Software Solutions and Services \| New World Systems Corporation
Goodwill [Line Items]
Goodwill acquired		0
Goodwill, purchase price adjustments	0
Appraisal and Tax Software Solutions and Services \| Brazos Technology Corporation
Goodwill [Line Items]
Goodwill acquired		$ 0
Appraisal and Tax Software Solutions and Services \| Small Acquisition
Goodwill [Line Items]
Goodwill acquired	$ 0

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-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

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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 (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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