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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, 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 |

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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://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 + 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://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 + Details
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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. + Details
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