Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Operating revenues	$ 417,708,000	$ 444,900,000
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	118,670,000	123,672,000
Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	45,416,000	37,164,000
Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	16,976,000	16,974,000
Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	66,323,000	71,444,000
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	67,814,000	81,485,000
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	$ 86,582,000	89,881,000
Expected service period revenue is recognized	10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ 15,927,000	24,280,000
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	175,808,000	173,767,000
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	118,670,000	123,672,000
Operating Segments | PIRM | Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	45,416,000	37,164,000
Operating Segments | PIRM | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | PIRM | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | PIRM | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | PIRM | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | PIRM | Other
Disaggregation of Revenue [Line Items]
Operating revenues	11,722,000	12,931,000
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	244,518,000	273,419,000
Operating Segments | UWS | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | UWS | Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | UWS | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	16,976,000	16,974,000
Operating Segments | UWS | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	66,323,000	71,444,000
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	67,814,000	81,485,000
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	86,582,000	89,881,000
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	6,823,000	13,635,000
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(2,618,000)	(2,286,000)
Corporate and Eliminations | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ (2,618,000)	$ (2,286,000)