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Deferred Revenue and Performance Obligations - Deferred Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
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