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Segment and Related Information - Schedule of Segment Revenues and Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 241,981	$ 236,067	$ 236,060	$ 221,174	$ 217,701	$ 214,706	$ 208,763	$ 199,729	$ 935,282	$ 840,899	$ 759,880
Depreciation and amortization expense									61,759	53,395	49,773
Total segment operating income									152,492	162,758	137,656
Capital expenditures									25,132	45,618	36,723
Total assets	1,790,963				1,611,351				1,790,963	1,611,351	1,378,503
Operating segments | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									853,200	765,133	689,739
Depreciation and amortization expense									50,130	43,987	43,434
Total segment operating income									237,159	229,001	196,054
Capital expenditures									13,973	28,096	23,843
Total assets	556,100				365,736				556,100	365,736	321,886
Operating segments | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									90,356	81,579	73,868
Depreciation and amortization expense									914	760	984
Total segment operating income									23,094	20,788	18,871
Capital expenditures									782	1,181	1,432
Total assets	63,670				46,279				63,670	46,279	33,005
Corporate and Elimination
Segment Reporting Information [Line Items]
Revenue									(8,274)	(5,813)	(3,727)
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization expense									10,715	8,648	5,355
Total segment operating income									(68,572)	(51,964)	(41,832)
Capital expenditures									10,377	16,341	11,448
Total assets	$ 1,171,193				$ 1,199,336				1,171,193	1,199,336	1,023,612
Intercompany
Segment Reporting Information [Line Items]
Revenue									(13,155)	(10,425)	(6,742)
Intercompany | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									13,155	10,425	6,742
Intercompany | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments And Corporate Non Segment
Segment Reporting Information [Line Items]
Total segment operating income									191,681	197,825	173,093
Software licenses and royalties
Segment Reporting Information [Line Items]
Revenue									93,441	86,242	83,733
Software licenses and royalties | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									83,735	78,388	78,271
Software licenses and royalties | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									9,706	7,854	5,462
Software licenses and royalties | Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Subscriptions
Segment Reporting Information [Line Items]
Revenue									220,547	172,176	142,657
Subscriptions | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									210,740	164,317	135,469
Subscriptions | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									9,807	7,859	7,188
Subscriptions | Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Software services
Segment Reporting Information [Line Items]
Revenue									191,269	180,460	171,648
Software services | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									166,921	161,245	155,322
Software services | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									24,348	19,215	16,326
Software services | Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Maintenance
Segment Reporting Information [Line Items]
Revenue									384,521	359,319	320,998
Maintenance | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									359,904	337,701	302,409
Maintenance | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									24,617	21,618	18,589
Maintenance | Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Appraisal services
Segment Reporting Information [Line Items]
Revenue									21,846	25,023	26,287
Appraisal services | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									0	0	0
Appraisal services | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									21,846	25,023	26,287
Appraisal services | Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Hardware and other
Segment Reporting Information [Line Items]
Revenue									23,658	17,679	14,557
Hardware and other | Enterprise Software
Segment Reporting Information [Line Items]
Revenue									18,745	13,057	11,526
Hardware and other | Appraisal and Tax
Segment Reporting Information [Line Items]
Revenue									32	10	16
Hardware and other | Corporate
Segment Reporting Information [Line Items]
Revenue									$ 4,881	$ 4,612	$ 3,015

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