Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended										12 Months Ended					12 Months Ended											0 Months Ended	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010		Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Geospatial Data [Member]	Dec. 31, 2010 Geospatial Data [Member]	Dec. 31, 2011 Buildings [Member] Y	Dec. 31, 2011 Furniture and equipment [Member] Y	Dec. 31, 2011 Capitalized software [Member] Y	Dec. 31, 2011 Database Development Costs [Member] Y	Dec. 31, 2011 Overstatement of Noncurrent Deferred Tax Assets Accumulated Prior to 2007 [Member]	Dec. 31, 2010 Restatement Adjustment [Member] Overstatement of Noncurrent Deferred Tax Assets Accumulated Prior to 2007 [Member]	Dec. 31, 2009 Restatement Adjustment [Member] Overstatement of Noncurrent Deferred Tax Assets Accumulated Prior to 2007 [Member]	Dec. 31, 2011 Restatement Adjustment [Member] Overstatement of Noncurrent Deferred Tax Assets Accumulated Prior to 2007 [Member]	Dec. 31, 2011 Restatement Adjustment [Member] Overstatement Relating to 2010 and 2009 Discontinued Operations [Member]	Dec. 31, 2011 Reclassification [Member]	Dec. 31, 2010 Reclassification [Member]	Dec. 22, 2010 Employer And Litigation Services [Member]	Dec. 31, 2010 Employer And Litigation Services [Member] Restatement Adjustment [Member]	Dec. 31, 2009 Employer And Litigation Services [Member] Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Error Corrections, Amount of Error Identified																				$ 20,600,000
Balance sheet items:
Assets of Discontinued Operations																					8,018,000	(3,014,000)
Current assets	655,979,000					1,052,301,000					655,979,000	1,052,301,000									8,018,000	(3,014,000)
Total Assets	3,110,071,000					3,234,825,000					3,110,071,000	3,234,825,000									8,018,000	(3,014,000)
Retained Earnings (Accumulated Deficit)	209,389,000					297,036,000					209,389,000	297,036,000									8,018,000	(3,014,000)	9,600,000	11,000,000
Total CoreLogic stockholders' equity	1,242,521,000					1,542,786,000					1,242,521,000	1,542,786,000									8,018,000	(3,014,000)
Statement of operations:
(Loss) income from discontinued operations, net of tax											(127,124,000)	(83,536,000)	150,658,000								11,032,000	(3,014,000)					(19,000,000)	6,900,000	2,800,000
Net (loss)/income											(73,629,000)	(18,630,000)	254,277,000								11,032,000	(3,014,000)
Per share basic and diluted impact:
Basic	$ (0.21)	$ (1.01)	$ 0.29		$ 0.20	$ (0.14)	$ (0.80)	$ 0.23		$ 0.28	$ (0.68)	$ (0.51)	$ 2.08								$ 0.10	$ (0.03)
Diluted	$ (0.21)	$ (1.01)	$ 0.29	[1]	$ 0.20	$ (0.14)	$ (0.79)	$ 0.23	[2]	$ 0.28	$ (0.68)	$ (0.50)	$ 2.06								$ 0.10	$ (0.03)
Reclassifications [Abstract]
Restricted Cash and Cash Equivalents, Noncurrent	22,044,000					21,095,000					22,044,000	21,095,000
Liability for Uncertain Tax Positions, Noncurrent																									26,600,000	23,200,000
Payments of Debt Issuance Costs											22,810,000	14,776,000	0
Property, Plant and Equipment [Abstract]
Property and equipment, estimated useful lives, minimum (in years)																25	3	3	7
Property and equipment, estimated useful lives, maximum (in years)																40	10	10	20
Cash and Cash Equivalents [Abstract]
Maximum Number of Days Of Initial Maturity For Cash Equivalents To Be Considered Short Term Investments											90 days
Escrow Deposit	593,900,000					225,500,000					593,900,000	225,500,000
Reserves Incorrect Disposition Of Assets	16,000,000					16,700,000					16,000,000	16,700,000
Capitalized Data and Database Development Costs, Net [Abstract]
Capitalized data and database costs carrying value	$ 444,516,000					$ 332,897,000					$ 444,516,000	$ 332,897,000		$ 52,916,000	$ 52,916,000
Revenue Recognition [Abstract]
Subscription-based Revenues Contractual Term In Years											10 years
Share-based Compensation [Abstract]
Employee Stock Purchase Plan Percent of Stock Price At Closing Date	85.00%										85.00%

[1] Amounts for the quarter ended June 30, 2011, have been revised to reflect financial statement revisions net of tax of $1.8 million of income, which impacted earnings per share by $0.02 per share on both a basic and diluted basis in the second quarter of 2011.

[2] ) Amounts for the quarter ended June 30, 2010, have been revised to reflect financial statement revisions net of tax of $2.8 million of income, which impacted earnings per share by $0.02 per share on both a basic and diluted basis in the second quarter of 2010.