Segment and Related Information - Schedule of Segment Revenues and Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Software licenses and royalties	$ 19,842	$ 19,930	$ 55,172	$ 54,331
Subscriptions	44,840	36,869	125,889	104,926
Software services	47,479	44,738	139,869	133,208
Maintenance	92,285	83,000	268,556	237,775
Appraisal services	6,290	6,541	19,268	20,083
Hardware and other	3,410	3,419	14,057	12,439
Total revenues	214,146	194,497	622,811	562,762
Segment operating income	43,447	36,945	116,671	95,901
Operating segments
Segment Reporting Information [Line Items]
Segment operating income	52,412	46,001	143,327	122,911
Corporate
Segment Reporting Information [Line Items]
Hardware and other	(2)	(9)	4,622	3,017
Total revenues	(2,662)	(1,980)	(2,687)	(1,726)
Segment operating income	(13,578)	(11,084)	(37,468)	(29,774)
Intercompany
Segment Reporting Information [Line Items]
Total revenues	(2,660)	(1,971)	(7,309)	(4,743)
Enterprise Software \| Operating segments
Segment Reporting Information [Line Items]
Software licenses and royalties	18,223	18,492	50,151	50,585
Subscriptions	42,826	35,169	120,191	99,470
Software services	42,295	40,608	125,658	121,372
Maintenance	86,576	78,292	253,048	223,802
Hardware and other	3,412	3,428	9,435	9,406
Total revenues	195,992	177,960	565,792	509,378
Segment operating income	60,511	52,372	166,692	139,151
Enterprise Software \| Intercompany
Segment Reporting Information [Line Items]
Total revenues	2,660	1,971	7,309	4,743
Appraisal and Tax \| Operating segments
Segment Reporting Information [Line Items]
Software licenses and royalties	1,619	1,438	5,021	3,746
Subscriptions	2,014	1,700	5,698	5,456
Software services	5,184	4,130	14,211	11,836
Maintenance	5,709	4,708	15,508	13,973
Appraisal services	6,290	6,541	19,268	20,083
Hardware and other	0	0	0	16
Total revenues	20,816	18,517	59,706	55,110
Segment operating income	$ 5,479	$ 4,713	$ 14,103	$ 13,534

Appraisal services revenue.

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- Definition

Revenue from resale of third party hardware and other revenues.

+ References

No definition available.

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- Definition

Subscription revenue comprised of fees from application service provider arrangements and other hosted service offerings, software subscriptions, electronic filing solutions, and disaster recovery services. These services also include professional services and maintenance support.

+ References

No definition available.

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Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

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- Definition

Revenue derived from maintenance services provided under contracts or arrangements with clients. For example, it may include the maintenance of software, plant and equipment, and facilities.

+ References

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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- Definition

Revenue from providing technology services. The services may include training, installation, engineering or consulting. Consulting services often include implementation support, software design or development, or the customization or modification of the licensed software.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 605
-Section 25
-Paragraph 76
-URI http://asc.fasb.org/extlink&oid=68047459&loc=d3e132428-111767

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