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Deferred Revenue and Performance Obligations - Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Jan. 01, 2017
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | $ 299,887 | $ 290,100
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted) | 299,887 |
Deferral of revenue | 871,498 |
Recognition of deferred revenue | (820,449) |
Balance, end of period | 350,936 |
Operating segments | Enterprise Software |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 277,198 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted) | 277,198 |
Balance, end of period | 327,521 |
Operating segments | Appraisal and Tax |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 20,387 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted) | 20,387 |
Balance, end of period | 20,018 |
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 2,302 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted) | 2,302 |
Balance, end of period | $ 3,397 |

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