Operating Revenues - Operating Revenues by Solution Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 444,900
Property Insights
Disaggregation of Revenue [Line Items]
Operating Revenue	123,672
Insurance & Spatial Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	37,164
Flood Data Services
Disaggregation of Revenue [Line Items]
Operating Revenue	16,974
Valuations Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	71,444
Credit Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	81,485
Property Tax Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 89,881
Expected service period revenue is recognized	10 years
Other
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 24,280
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating Revenue	173,767
Operating Segments | PIRM | Property Insights
Disaggregation of Revenue [Line Items]
Operating Revenue	123,672
Operating Segments | PIRM | Insurance & Spatial Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	37,164
Operating Segments | PIRM | Flood Data Services
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | PIRM | Valuations Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | PIRM | Credit Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | PIRM | Property Tax Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | PIRM | Other
Disaggregation of Revenue [Line Items]
Operating Revenue	12,931
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating Revenue	273,419
Operating Segments | UWS | Property Insights
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | UWS | Insurance & Spatial Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Operating Segments | UWS | Flood Data Services
Disaggregation of Revenue [Line Items]
Operating Revenue	16,974
Operating Segments | UWS | Valuations Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	71,444
Operating Segments | UWS | Credit Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	81,485
Operating Segments | UWS | Property Tax Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	89,881
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating Revenue	13,635
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating Revenue	(2,286)
Corporate and Eliminations | Property Insights
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Insurance & Spatial Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Flood Data Services
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Valuations Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Credit Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Property Tax Solutions
Disaggregation of Revenue [Line Items]
Operating Revenue	0
Corporate and Eliminations | Other
Disaggregation of Revenue [Line Items]
Operating Revenue	$ (2,286)