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Summary of Significant Accounting Policies - New Accounting Standard (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
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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 | Jan. 01, 2019
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 241,981 | $ 236,067 | $ 236,060 | $ 221,174 | $ 217,701 | $ 214,706 | $ 208,763 | $ 199,729 | $ 935,282 | $ 840,899 | $ 759,880 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 207,605 | 175,914 | 165,176 |
Amortization of customer and trade name intangibles |  |  |  |  |  |  |  |  | 16,217 | 13,381 | 13,202 |
Operating income |  |  |  |  |  |  |  |  | 152,492 | 162,758 | 137,656 |
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 8,408 | (6,115) | 21,957 |
Net income | $ 31,552 | $ 38,924 | $ 39,161 | $ 37,825 | $ 66,196 | $ 38,836 | $ 31,770 | $ 32,769 | $ 147,462 | $ 169,571 | $ 113,701 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (USD per share) |  |  |  |  |  |  |  |  | $ 3.84 | $ 4.55 | $ 3.12 |
Diluted (USD per share) | $ 0.79 | $ 0.96 | $ 0.97 | $ 0.95 | $ 1.68 | $ 0.99 | $ 0.81 | $ 0.84 | $ 3.68 | $ 4.32 | $ 2.92 |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 298,912 |  |  |  | $ 246,188 |  |  |  | $ 298,912 | $ 246,188 |  |
Prepaid expenses | 33,258 |  |  |  | 32,206 |  |  |  | 33,258 | 32,206 |  |
Accounts receivable, long-term | 16,020 |  |  |  | 12,107 |  |  |  | 16,020 | 12,107 |  |
Other intangibles, net | 276,852 |  |  |  | 229,617 |  |  |  | 276,852 | 229,617 |  |
Total assets | 1,790,963 |  |  |  | 1,611,351 |  |  |  | 1,790,963 | 1,611,351 | $ 1,378,503 |
Deferred revenue | 350,512 |  |  |  | 298,613 |  |  |  | 350,512 | 298,613 |  |
Deferred income taxes |  |  |  |  | 46,879 |  |  |  |  | 46,879 |  |
Retained earnings | 771,925 |  |  |  | 624,463 |  |  |  | 771,925 | 624,463 |  |
Liabilities and Equity | $ 1,790,963 |  |  |  | 1,611,351 |  |  |  | 1,790,963 | 1,611,351 |  |
Software licenses and royalties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 93,441 | 86,242 | 83,733 |
Subscriptions |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 220,547 | 172,176 | 142,657 |
Software services |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 191,269 | 180,460 | 171,648 |
Maintenance |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 384,521 | 359,319 | 320,998 |
Appraisal services |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 21,846 | 25,023 | 26,287 |
Hardware and other |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 23,658 | 17,679 | 14,557 |
As Reported |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 840,662 | 756,043 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 176,974 | 167,161 |
Amortization of customer and trade name intangibles |  |  |  |  |  |  |  |  |  | 13,912 | 13,731 |
Operating income |  |  |  |  |  |  |  |  |  | 160,930 | 131,305 |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (2,317) | 19,450 |
Net income |  |  |  |  |  |  |  |  |  | $ 163,945 | $ 109,857 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (USD per share) |  |  |  |  |  |  |  |  |  | $ 4.40 | $ 3.01 |
Diluted (USD per share) |  |  |  |  |  |  |  |  |  | $ 4.18 | $ 2.87 |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 227,127 |  |  |  |  | $ 227,127 |  |
Prepaid expenses |  |  |  |  | 27,252 |  |  |  |  | 27,252 |  |
Accounts receivable, long-term |  |  |  |  | 7,536 |  |  |  |  | 7,536 |  |
Other intangibles, net |  |  |  |  | 236,444 |  |  |  |  | 236,444 |  |
Total assets |  |  |  |  | 1,589,592 |  |  |  |  | 1,589,592 |  |
Deferred revenue |  |  |  |  | 309,461 |  |  |  |  | 309,461 |  |
Deferred income taxes |  |  |  |  | 38,914 |  |  |  |  | 38,914 |  |
Retained earnings |  |  |  |  | 599,821 |  |  |  |  | 599,821 |  |
Liabilities and Equity |  |  |  |  | 1,589,592 |  |  |  |  | 1,589,592 |  |
As Reported | Software licenses and royalties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 75,694 | $ 74,306 |
As Reported | Subscriptions |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 173,510 | 142,704 |
As Reported | Software services |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 187,149 | 174,804 |
As Reported | Maintenance |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 361,569 | 322,969 |
As Reported | Appraisal services |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 25,023 | 26,287 |
As Reported | Hardware and other |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 17,717 | 14,973 |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 237 | 3,837 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (1,060) | (1,985) |
Amortization of customer and trade name intangibles |  |  |  |  |  |  |  |  |  | (531) | (529) |
Operating income |  |  |  |  |  |  |  |  |  | 1,828 | 6,351 |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (3,798) | 2,507 |
Net income |  |  |  |  |  |  |  |  |  | 5,626 | 3,844 |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 19,061 |  |  |  |  | 19,061 |  |
Prepaid expenses |  |  |  |  | 4,954 |  |  |  |  | 4,954 |  |
Accounts receivable, long-term |  |  |  |  | 4,571 |  |  |  |  | 4,571 |  |
Other intangibles, net |  |  |  |  | (6,827) |  |  |  |  | (6,827) |  |
Total assets |  |  |  |  | 21,759 |  |  |  |  | 21,759 |  |
Deferred revenue |  |  |  |  | (10,848) |  |  |  |  | (10,848) |  |
Deferred income taxes |  |  |  |  | 7,965 |  |  |  |  | 7,965 |  |
Retained earnings |  |  |  |  | 24,642 |  |  |  |  | 24,642 |  |
Liabilities and Equity |  |  |  |  | $ 21,759 |  |  |  |  | 21,759 |  |
Adjustments | Software licenses and royalties | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 10,548 | 9,427 |
Adjustments | Subscriptions | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (1,334) | (47) |
Adjustments | Software services | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (6,689) | (3,156) |
Adjustments | Maintenance | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (2,250) | (1,971) |
Adjustments | Appraisal services | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 0 |
Adjustments | Hardware and other | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ (38) | $ (416) |
Minimum | Forecast | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Lease right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 15,500
Lease liability |  |  |  |  |  |  |  |  |  |  |  | 15,500
Maximum | Forecast | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Lease right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | 17,800
Lease liability |  |  |  |  |  |  |  |  |  |  |  | $ 17,800

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