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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Software licenses and royalties                 $ 75,694 $ 74,306 $ 59,008
Subscriptions                 173,510 142,704 111,933
Software services                 187,149 174,804 139,852
Maintenance                 361,569 322,969 245,537
Appraisal services                 25,023 26,287 25,065
Hardware and other                 17,717 14,973 9,627
Intercompany                     0
Total revenues $ 217,851 $ 214,146 $ 209,123 $ 199,542 $ 193,281 $ 194,497 $ 188,972 $ 179,293 840,662 756,043 591,022
Depreciation and amortization expense                 53,925 50,301 19,574
Segment operating income                 196,528 167,271 118,388
Capital expenditures                 45,618 36,723 13,504
Segment assets 1,589,592       1,357,945       1,589,592 1,357,945 1,356,570
Operating segments | Enterprise Software Solutions                      
Segment Reporting Information [Line Items]                      
Software licenses and royalties                 67,840 68,844 54,376
Subscriptions                 165,651 135,516 107,090
Software services                 167,934 158,478 129,068
Maintenance                 339,951 304,380 227,586
Appraisal services                     0
Hardware and other                 13,094 11,942 6,935
Intercompany                 10,425 6,742 4,025
Total revenues                 764,895 685,902 529,080
Depreciation and amortization expense                 44,517 43,962 15,413
Segment operating income                 228,254 190,817 141,401
Capital expenditures                 28,096 23,843 6,112
Segment assets 338,965       295,260       338,965 295,260 265,877
Operating segments | Appraisal and Tax Software Solutions and Services                      
Segment Reporting Information [Line Items]                      
Software licenses and royalties                 7,854 5,462 4,632
Subscriptions                 7,859 7,188 4,843
Software services                 19,215 16,326 10,784
Maintenance                 21,618 18,589 17,951
Appraisal services                 25,023 26,287 25,065
Hardware and other                 10 16 12
Intercompany                     0
Total revenues                 81,579 73,868 63,287
Depreciation and amortization expense                 760 984 867
Segment operating income                 20,238 18,286 15,477
Capital expenditures                 1,181 1,432 646
Segment assets 44,464       31,769       44,464 31,769 22,283
Corporate                      
Segment Reporting Information [Line Items]                      
Software licenses and royalties                     0
Subscriptions                     0
Software services                     0
Maintenance                     0
Appraisal services                     0
Hardware and other                 4,613 3,015 2,680
Intercompany                 (10,425) (6,742) (4,025)
Total revenues                 (5,812) (3,727) (1,345)
Depreciation and amortization expense                 8,648 5,355 3,294
Segment operating income                 (51,964) (41,832) (38,490)
Capital expenditures                 16,341 11,448 6,746
Segment assets $ 1,206,163       $ 1,030,916       $ 1,206,163 $ 1,030,916 $ 1,068,410