Acquisitions (Details)	12 Months Ended		1 Months Ended		1 Months Ended			3 Months Ended			8 Months Ended		8 Months Ended					1 Months Ended		3 Months Ended						12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Tarasoft [Member] USD ($)	Sep. 30, 2011 Tarasoft [Member] CAD	Sep. 30, 2011 Tarasoft [Member] Customer lists [Member] USD ($) Y	Sep. 30, 2011 Tarasoft [Member] Trade names and licenses [Member] USD ($) Y	Sep. 30, 2011 Tarasoft [Member] Noncompete agreements [Member] USD ($) Y	Jun. 30, 2011 RP Data [Member] USD ($)	May 31, 2011 RP Data [Member] USD ($)	May 31, 2011 RP Data [Member] AUD	Dec. 31, 2011 RP Data [Member] Customer lists [Member] Y	May 31, 2011 RP Data [Member] Customer lists [Member] USD ($)	Dec. 31, 2011 RP Data [Member] Trade names and licenses [Member] Y	May 31, 2011 RP Data [Member] Trade names and licenses [Member] USD ($)	Dec. 31, 2011 Dorado Network Systems [Member] USD ($)	Mar. 31, 2011 Dorado Network Systems [Member] USD ($)	Dec. 31, 2010 Dorado Network Systems [Member] USD ($)	Jan. 31, 2011 Dorado Network Systems [Member] Customer lists [Member] Y	Mar. 31, 2011 Dorado Network Systems [Member] Customer lists [Member] USD ($)	Mar. 31, 2011 Dorado Network Systems [Member] Trade names and licenses [Member] USD ($) Y	Mar. 31, 2010 Corelogic Information Solutions Holdings [Member]	Mar. 29, 2010 Corelogic Information Solutions Holdings [Member] USD ($)	Dec. 31, 2009 Prior Year Acquisitions [Member] USD ($)	Dec. 31, 2009 Noncontrolling Interest [Member] USD ($)	Dec. 31, 2009 FADV [Member] USD ($)	Dec. 31, 2011 Data and Analytics [Member] USD ($)	Dec. 31, 2010 Data and Analytics [Member] USD ($)	Dec. 31, 2009 Data and Analytics [Member] USD ($)	May 31, 2011 Data and Analytics [Member] RP Data [Member] USD ($)	Dec. 31, 2011 Business and Information Services [Member] USD ($)	Dec. 31, 2010 Business and Information Services [Member] USD ($)	Dec. 31, 2011 Default Services [Member] USD ($)	Dec. 31, 2010 Default Services [Member] USD ($)
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid			$ 30,300,000	30,000,000					$ 157,200,000	147,200,000						$ 31,600,000						$ 72,000,000	$ 5,200,000	$ 62,000,000				$ 4,800,000			$ 11,400,000
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Current	0	72,000,000
Goodwill, Acquired During Period	192,083,000	13,622,000	17,900,000																							172,419,000	0		154,500,000	19,664,000	1,500,000	0	12,122,000
Business Acquisition Purchase Price Allocation Developed Software					2,700,000	400,000	200,000					46,700,000		11,700,000					20,400,000	3,200,000								3,000,000			3,700,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life					10	10	5				8		10					12		5
Equity Method Investment, Ownership Percentage									40.20%	40.20%							39.00%
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized									58,900,000								(14,500,000)														3,400,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount															19,700,000													2,300,000
Business Acquisition Percentage Of Voting Interests To Be Acquired																					18.00%
Business Acquisition, Percentage of Voting Interests Acquired																						9.00%
Notional Amount of Foreign Currency Derivatives										180,300,000
Business Acquisition Recognized Marked To Market Gain								1,800,000
Business Acquisition Purchase Price Allocation Fair Value Of Noncontrolling Interests Acquired																															2,300,000
Business Acquisition, Cost of Acquired Entity, Other Noncash Consideration																									311,300,000
Business Acquisition, Cost of Acquired Entity, Transaction Costs																									$ 9,100,000