Segment and Related Information - Schedule of Segment Revenues and Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Software licenses and royalties									$ 59,008	$ 49,065	$ 40,841
Subscriptions									111,933	87,848	61,864
Software services									139,852	113,821	93,267
Maintenance									245,537	212,696	191,720
Appraisal services									25,065	21,802	20,825
Hardware and other									9,627	7,869	8,126
Total revenues	$ 158,916	$ 150,845	$ 146,295	$ 134,966	$ 127,440	$ 128,664	$ 124,371	$ 112,626	591,022	493,101	416,643
Depreciation and amortization expense									19,574	14,605	13,786
Segment operating income									118,388	101,226	73,723
Capital expenditures									13,504	9,449	26,145
Segment assets	1,356,570				569,812				1,356,570	569,812	444,488
Operating segments [Member] | Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties									54,376	46,047	38,774
Subscriptions									107,090	84,322	59,070
Software services									129,068	104,146	85,459
Maintenance									227,586	195,881	175,180
Hardware and other									6,935	5,398	6,342
Intercompany									4,025	2,812	2,899
Total revenues									529,080	438,606	367,724
Depreciation and amortization expense									15,413	11,140	10,569
Segment operating income									141,401	114,993	85,045
Capital expenditures									6,112	3,644	22,457
Segment assets	265,877				170,369				265,877	170,369	161,923
Operating segments [Member] | Appraisal and Tax Software Solutions and Services [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties									4,632	3,018	2,067
Subscriptions									4,843	3,526	2,794
Software services									10,784	9,675	7,808
Maintenance									17,951	16,815	16,540
Appraisal services									25,065	21,802	20,825
Hardware and other									12	11
Total revenues									63,287	54,847	50,034
Depreciation and amortization expense									867	866	1,028
Segment operating income									15,477	11,603	9,428
Capital expenditures									646	359	250
Segment assets	22,283				16,463				22,283	16,463	16,244
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other									2,680	2,460	1,784
Intercompany									(4,025)	(2,812)	(2,899)
Total revenues									(1,345)	(352)	(1,115)
Depreciation and amortization expense									3,294	2,599	2,189
Segment operating income									(38,490)	(25,370)	(20,750)
Capital expenditures									6,746	5,446	3,438
Segment assets	$ 1,068,410				$ 382,980				$ 1,068,410	$ 382,980	$ 266,321