Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Operating revenues	$ 443,885	$ 417,708
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	116,977	118,670
Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	46,840	45,416
Flood data solutions
Disaggregation of Revenue [Line Items]
Operating revenues	27,603	16,976
Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	61,247	66,323
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	81,127	67,814
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	$ 101,991	86,582
Expected service period revenue is recognized	10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ 8,100	15,927
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	173,055	175,808
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	116,977	118,670
Operating Segments | PIRM | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	46,840	45,416
Operating Segments | PIRM | Flood data solutions
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	9,238	11,722
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	275,621	244,518
Operating Segments | UWS | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | UWS | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Operating Segments | UWS | Flood data solutions
Disaggregation of Revenue [Line Items]
Operating revenues	27,603	16,976
Operating Segments | UWS | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	61,247	66,323
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	81,127	67,814
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	101,991	86,582
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	3,653	6,823
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(4,791)	(2,618)
Corporate and Eliminations | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	0	0
Corporate and Eliminations | Flood data solutions
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	$ (4,791)	$ (2,618)