Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Operating revenues	$ 458,957	$ 451,768	$ 1,336,203	$ 1,385,069
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	121,843	125,319	363,250	376,284
Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,739	41,666	142,576	119,691
Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	22,983	18,213	61,572	54,098
Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	77,426	73,468	230,891	226,368
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	71,687	75,283	211,187	235,651
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	$ 103,671	94,637	$ 282,724	301,998
Expected service period revenue is recognized	10 years		10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ 12,608	23,182	$ 44,003	70,979
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	181,649	180,607	541,174	537,029
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	121,843	125,319	363,250	376,284
Operating Segments | PIRM | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,739	41,666	142,576	119,691
Operating Segments | PIRM | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | PIRM | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | PIRM | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | PIRM | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | PIRM | Other
Disaggregation of Revenue [Line Items]
Operating revenues	11,067	13,622	35,348	41,054
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	280,828	273,625	804,363	855,270
Operating Segments | UWS | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | UWS | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Operating Segments | UWS | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	22,983	18,213	61,572	54,098
Operating Segments | UWS | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	77,426	73,468	230,891	226,368
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	71,687	75,283	211,187	235,651
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	103,671	94,637	282,724	301,998
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	5,061	12,024	17,989	37,155
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(3,520)	(2,464)	(9,334)	(7,230)
Corporate and Eliminations | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0	0	0
Corporate and Eliminations | Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ (3,520)	$ (2,464)	$ (9,334)	$ (7,230)