Operating Revenues - Operating Revenues by Solution Type (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Operating revenues	$ 451,768,000	$ 483,131,000	$ 1,385,069,000	$ 1,396,960,000
Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	125,319,000		376,284,000
Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	41,666,000		119,691,000
Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	18,213,000		54,098,000
Valuations solutions
Disaggregation of Revenue [Line Items]
Operating revenues	73,468,000		226,368,000
Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	75,283,000		235,651,000
Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	94,637,000		$ 301,998,000
Expected service period revenue is recognized			10 years
Other
Disaggregation of Revenue [Line Items]
Operating revenues	23,182,000		$ 70,979,000
Operating Segments | PIRM
Disaggregation of Revenue [Line Items]
Operating revenues	180,607,000	180,796,000	537,029,000	522,863,000
Operating Segments | PIRM | Property insights
Disaggregation of Revenue [Line Items]
Operating revenues	125,319,000		376,284,000
Operating Segments | PIRM | Insurance & spatial solutions
Disaggregation of Revenue [Line Items]
Operating revenues	41,666,000		119,691,000
Operating Segments | PIRM | Flood data services
Disaggregation of Revenue [Line Items]
Operating revenues	0		0
Operating Segments | PIRM | Valuations 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	13,622,000		41,054,000
Operating Segments | UWS
Disaggregation of Revenue [Line Items]
Operating revenues	273,625,000	$ 304,977,000	855,270,000	$ 881,199,000
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	18,213,000		54,098,000
Operating Segments | UWS | Valuations solutions
Disaggregation of Revenue [Line Items]
Operating revenues	73,468,000		226,368,000
Operating Segments | UWS | Credit solutions
Disaggregation of Revenue [Line Items]
Operating revenues	75,283,000		235,651,000
Operating Segments | UWS | Property tax solutions
Disaggregation of Revenue [Line Items]
Operating revenues	94,637,000		301,998,000
Operating Segments | UWS | Other
Disaggregation of Revenue [Line Items]
Operating revenues	12,024,000		37,155,000
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(2,464,000)		(7,230,000)
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 | Valuations 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	$ (2,464,000)		$ (7,230,000)