Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill Beginning Balance	$ 753,718	$ 657,987
Goodwill Ending Balance	840,117	753,718
Socrata, Inc.
Goodwill [Roll Forward]
Goodwill acquired		75,657
Other acquisitions
Goodwill [Roll Forward]
Goodwill acquired	10,080	20,074
MicroPact
Goodwill [Roll Forward]
Goodwill acquired	76,319
Enterprise Software
Goodwill [Roll Forward]
Goodwill Beginning Balance	747,161	651,430
Goodwill Ending Balance	833,560	747,161
Enterprise Software \| Socrata, Inc.
Goodwill [Roll Forward]
Goodwill acquired		75,657
Enterprise Software \| Other acquisitions
Goodwill [Roll Forward]
Goodwill acquired	10,080	20,074
Enterprise Software \| MicroPact
Goodwill [Roll Forward]
Goodwill acquired	76,319
Appraisal and Tax
Goodwill [Roll Forward]
Goodwill Beginning Balance	6,557	6,557
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	$ 0
Appraisal and Tax \| MicroPact
Goodwill [Roll Forward]
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://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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- 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

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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