Acquisitions (Details)	12 Months Ended		1 Months Ended					12 Months Ended		1 Months Ended			1 Months Ended			3 Months Ended			8 Months Ended		8 Months Ended		12 Months Ended			1 Months Ended		3 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 CDS [Member] USD ($)	Sep. 30, 2011 CDS [Member] Customer lists [Member] USD ($) Y	Sep. 30, 2011 CDS [Member] Trade names and licenses [Member] USD ($) Y	Sep. 30, 2011 CDS [Member] Noncompete agreements [Member] USD ($) Y	Jul. 31, 2012 RELS Reporting Services, LLC [Member] USD ($)	Dec. 31, 2012 RELS Reporting Services, LLC [Member] USD ($)	Jun. 30, 2012 RELS Reporting Services, LLC [Member]	Jul. 31, 2012 RELS Reporting Services, LLC [Member] Customer lists [Member] USD ($) Y	Sep. 30, 2011 Tarasoft [Member] USD ($)	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	Dec. 31, 2010 Corelogic Information Solutions Holdings [Member] USD ($)	Mar. 31, 2010 Corelogic Information Solutions Holdings [Member]	Mar. 29, 2010 Corelogic Information Solutions Holdings [Member] USD ($)	Dec. 31, 2012 Data and Analytics [Member] USD ($)	Dec. 31, 2011 Data and Analytics [Member] USD ($)	May 31, 2011 Data and Analytics [Member] RP Data [Member] USD ($)	Dec. 31, 2012 Business and Information Services [Member] USD ($)	Dec. 31, 2012 Asset Management and Processing Solutions [Member] USD ($)	Dec. 31, 2011 Asset Management and Processing Solutions [Member] USD ($)	Dec. 31, 2010 Asset Management and Processing Solutions [Member] USD ($)	Dec. 31, 2010 Deductible for Tax Purposes [Member] Asset Management and Processing Solutions [Member] USD ($)	Apr. 30, 2010 Experian Information Solutions [Member]	Dec. 31, 2010 Experian Information Solutions [Member] Corelogic Information Solutions Holdings [Member] USD ($)
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, purchase price							$ 3,000,000
Dividends received from investments in affiliates							1,500,000
Equity method investment, ownership percentage									50.10%								40.20%	40.20%							39.00%
Loss on equity method investment								1,200,000
Acquired finite-lived intangible asset, amount										3,100,000
Acquired finite-lived intangible asset, weighted average useful life				13	14	5				3.0			10	10	5				8		10					12		5
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																																								20.00%
Business Acquisition, Cost of Acquired Noncontrolling Interest																																									313,800,000
Cost of acquired entity, cash paid			78,800,000								30,300,000	30,000,000					157,200,000	147,200,000						31,600,000							72,000,000							11,400,000
Mandatorily redeemable noncontrolling interests																													72,000,000
Goodwill, acquired during period	33,875,000	192,083,000	33,900,000								17,900,000												19,664,000									33,875,000	172,419,000	154,500,000	0	0	0	12,100,000	8,900,000
Purchase price allocation, developed software				24,500,000	4,200,000	2,900,000							2,700,000	400,000	200,000					46,700,000		11,700,000					20,400,000	3,200,000										3,700,000
Business acquisition, preexisting relationship, gain (loss) recognized																	58,900,000								(14,500,000)													3,400,000
Notional amount of foreign currency derivatives																		180,300,000
Business acquisition, recognized marked to market gain																1,800,000
Purchase price allocation, goodwill																							19,700,000
Business acquisition, percentage of voting interests to be acquired																														18.00%
Business acquisition, percentage of voting interests acquired																															9.00%
Purchase price allocation, fair value of noncontrolling interests acquired																																						$ 2,300,000