Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Operating revenues	$ 459,538	$ 488,401	$ 877,246	$ 933,301
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	122,737	127,293	241,407	250,965
Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,421	40,861	93,837	78,025
Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	21,613	18,911	38,589	35,885
Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	87,142	81,456	153,465	152,900
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	71,686	78,883	139,500	160,368
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	$ 92,471	117,480	$ 179,053	207,361
Expected service period revenue is recognized	10 years		10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	$ 15,468	23,517	$ 31,395	47,797
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	183,717	182,655	359,525	356,422
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	122,737	127,293	241,407	250,965
Operating Segments | PIRM | Insurance and spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	48,421	40,861	93,837	78,025
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	12,559	14,501	24,281	27,432
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	279,017	308,226	523,535	581,645
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	21,613	18,911	38,589	35,885
Operating Segments | UWS | Valuation solutions
Disaggregation of Revenue [Line Items]
Operating revenues	87,142	81,456	153,465	152,900
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	71,686	78,883	139,500	160,368
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	92,471	117,480	179,053	207,361
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	6,105	11,496	12,928	25,131
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(3,196)	(2,480)	(5,814)	(4,766)
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	$ (3,196)	$ (2,480)	$ (5,814)	$ (4,766)