Segment and Related Information - Schedule of Segment Revenues and Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Software licenses and royalties	$ 17,551	$ 14,586	$ 34,401	$ 28,886
Subscriptions	33,968	26,949	68,057	52,237
Software services	46,040	34,563	88,470	65,367
Maintenance	78,743	59,463	154,775	116,811
Appraisal services	6,984	6,691	13,542	12,780
Hardware and other	5,686	4,043	9,020	5,180
Total revenues	188,972	146,295	368,265	281,261
Segment operating income	40,048	31,203	76,910	59,989
Operating segments [Member] | Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties	16,439	13,556	32,093	25,883
Subscriptions	32,316	25,733	64,301	50,042
Software services	42,159	31,826	80,763	60,994
Maintenance	74,110	54,992	145,510	108,007
Hardware and other	2,942	1,330	5,977	2,468
Intercompany	1,612	979	2,772	1,905
Total revenues	169,578	128,416	331,416	249,299
Segment operating income	46,109	34,408	86,778	66,660
Operating segments [Member] | Appraisal and Tax Software Solutions and Services [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties	1,112	1,030	2,308	3,003
Subscriptions	1,652	1,216	3,756	2,195
Software services	3,881	2,737	7,707	4,373
Maintenance	4,633	4,471	9,265	8,804
Appraisal services	6,984	6,691	13,542	12,780
Hardware and other		11	16	11
Total revenues	18,262	16,156	36,594	31,166
Segment operating income	3,990	3,903	8,821	6,971
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other	2,744	2,702	3,027	2,701
Intercompany	(1,612)	(979)	(2,772)	(1,905)
Total revenues	1,132	1,723	255	796
Segment operating income	$ (10,051)	$ (7,108)	$ (18,689)	$ (13,642)