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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill Beginning Balance	$ 657,987	$ 650,237
Goodwill acquired		7,750
Goodwill Ending Balance	753,718	657,987
Socrata, Inc.
Goodwill [Roll Forward]
Goodwill acquired	75,657
Other acquisitions
Goodwill [Roll Forward]
Goodwill acquired	20,074
Enterprise Software
Goodwill [Roll Forward]
Goodwill Beginning Balance	651,430	643,680
Goodwill acquired		7,750
Goodwill Ending Balance	747,161	651,430
Enterprise Software | Socrata, Inc.
Goodwill [Roll Forward]
Goodwill acquired	75,657
Enterprise Software | Other acquisitions
Goodwill [Roll Forward]
Goodwill acquired	20,074
Appraisal and Tax
Goodwill [Roll Forward]
Goodwill Beginning Balance	6,557	6,557
Goodwill acquired		0
Goodwill Ending Balance	6,557	$ 6,557
Appraisal and Tax | Socrata, Inc.
Goodwill [Roll Forward]
Goodwill acquired	0
Appraisal and Tax | Other acquisitions
Goodwill [Roll Forward]
Goodwill acquired	$ 0

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

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+ References

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