Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Operating revenues	$ 477,464	$ 459,538	$ 921,349	$ 877,246
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	118,836	122,737	235,813	241,407
Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,440	48,421	95,280	93,837
Flood data solutions
Disaggregation of Revenue [Line Items]
Operating revenues	29,977	21,613	57,580	38,589
Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	62,956	87,142	124,203	153,465
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	82,523	71,686	163,650	139,500
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	125,950	92,471	$ 227,941	179,053
Expected service period revenue is recognized			10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	8,782	15,468	$ 16,882	31,395
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	176,586	183,717	349,641	359,525
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	118,836	122,737	235,813	241,407
Operating Segments | PIRM | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,440	48,421	95,280	93,837
Operating Segments | PIRM | Flood data solutions
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	9,310	12,559	18,548	24,281
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	305,140	279,017	580,761	523,535
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 solutions
Disaggregation of Revenue [Line Items]
Operating revenues	29,977	21,613	57,580	38,589
Operating Segments | UWS | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	62,956	87,142	124,203	153,465
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	82,523	71,686	163,650	139,500
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	125,950	92,471	227,941	179,053
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	3,734	6,105	7,387	12,928
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(4,262)	(3,196)	(9,053)	(5,814)
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 solutions
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	$ (4,262)	$ (3,196)	$ (9,053)	$ (5,814)