Discontinued Operations (Details) (USD $)	3 Months Ended										12 Months Ended			0 Months Ended	12 Months Ended																					1 Months Ended	12 Months Ended		1 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. 22, 2010 Employer And Litigation Services [Member]	Dec. 31, 2011 Discontinued Operations FAFC [Member]	Dec. 31, 2010 Discontinued Operations FAFC [Member]	Dec. 31, 2009 Discontinued Operations FAFC [Member]	Dec. 31, 2011 Discontinued Operations Employer And Litigation Services Businesses [Member]	Dec. 31, 2010 Discontinued Operations Employer And Litigation Services Businesses [Member]	Dec. 31, 2009 Discontinued Operations Employer And Litigation Services Businesses [Member]	Dec. 31, 2011 Discontinued Operations Marketing [Member] Data and Analytics [Member]	Dec. 31, 2010 Discontinued Operations Marketing [Member] Data and Analytics [Member]	Dec. 31, 2009 Discontinued Operations Marketing [Member] Data and Analytics [Member]	Dec. 31, 2011 Discsontinued Operations Consumer [Member] Data and Analytics [Member]	Dec. 31, 2010 Discsontinued Operations Consumer [Member] Data and Analytics [Member]	Dec. 31, 2009 Discsontinued Operations Consumer [Member] Data and Analytics [Member]	Dec. 31, 2011 Discontinued Operations Appraisal [Member] Mortgage Origination Services [Member]	Dec. 31, 2010 Discontinued Operations Appraisal [Member] Mortgage Origination Services [Member]	Dec. 31, 2009 Discontinued Operations Appraisal [Member] Mortgage Origination Services [Member]	Dec. 31, 2011 Discontinued Operations Transportation [Member] Default Services [Member]	Dec. 31, 2010 Discontinued Operations Transportation [Member] Default Services [Member]	Dec. 31, 2009 Discontinued Operations Transportation [Member] Default Services [Member]	Dec. 31, 2011 Components Total [Member]	Dec. 31, 2010 Components Total [Member]	Dec. 31, 2009 Components Total [Member]	Sep. 30, 2011 Total Impairment Charges [Member]	Dec. 31, 2010 Impairment of Goodwill [Member] Employer And Litigation Services [Member]	Dec. 31, 2011 Non Cash Impairment [Member] Marketing Services Unit [Member]	Sep. 30, 2011 Impairment of Intangible Assets [Member] Marketing Services Unit [Member]	Sep. 30, 2011 Impairment of Intangible Assets [Member] 8741 Services, Management Services [Member]	Sep. 30, 2011 Impairment of Intangible Assets [Member] 4700 Transportation Services [Member]	Sep. 30, 2011 Impairment of Intangible Assets [Member] Consumer Services [Member]	Sep. 30, 2011 Allowance for Doubtful Accounts [Member] Marketing Services Unit [Member]	Sep. 30, 2011 Gain (Loss) on Disposition of Other Assets [Member] Marketing Services Unit [Member]	Dec. 31, 2011 Impairment of Intangible Assets [Member] Non Cash Impairment [Member] Marketing Services Unit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Total Current Assets															$ 0	$ 0		$ 0	$ 0		$ 3,380,000	$ 31,411,000		$ 14,833,000	$ 17,674,000		$ 1,038,000	$ 8,911,000		$ 13,252,000	$ 19,594,000		$ 32,503,000	$ 77,590,000
Discontinued operations, non-cash impairment charge																																				137,700,000	174,000,000	10,600,000	123,300,000	8,300,000	3,600,000	2,600,000	8,900,000	1,800,000	17,100,000
Proceeds from Divestiture of Businesses														265,000,000
Loss on sale of discontinued operations, net of tax	0	0	0		0	(18,985,000)	0	0		0	0	(18,985,000)	0	(34,500,000)
Income Statement [Abstract]
Operating revenue															0	1,490,501,000	3,938,616,000	0	242,895,000	209,280,000	29,399,000	44,221,000	97,842,000	94,755,000	89,573,000	58,399,000	69,890,000	141,856,000	149,693,000	66,115,000	67,346,000	64,596,000	260,159,000	2,076,392,000	4,518,426,000
(Loss)/income from discontinued operations before income taxes															0	76,323,000	229,989,000	0	(166,064,000)	9,193,000	(164,094,000)	(11,777,000)	(7,859,000)	(10,453,000)	11,950,000	12,713,000	(20,178,000)	8,304,000	17,391,000	(2,472,000)	1,432,000	6,051,000	(197,197,000)	(79,832,000)	267,478,000
Discontinued Operation, Tax Effect of Discontinued Operation															0	33,222,000	86,459,000	0	(27,433,000)	7,104,000	(61,947,000)	(10,340,000)	(3,144,000)	(2,205,000)	4,780,000	5,085,000	(6,172,000)	3,321,000	7,008,000	251,000	573,000	2,420,000	(70,073,000)	4,123,000	104,932,000
(Loss)/income, net of tax											(127,124,000)	(83,536,000)	150,658,000	(19,000,000)	0	43,101,000	143,530,000	0	(138,631,000)	2,089,000	(102,147,000)	(1,437,000)	(4,715,000)	(8,248,000)	7,170,000	7,628,000	(14,006,000)	4,983,000	10,383,000	(2,723,000)	859,000	3,631,000	(127,124,000)	(83,955,000)	162,546,000
Less: Net Income Attributable to Noncontrolling Interests															0	(419,000)	11,888,000	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	(419,000)	11,888,000
(Loss)/income from discontinued operations, net of tax	(15,999,000)	(104,220,000)	(8,556,000)	[1]	1,651,000	10,152,000	(142,479,000)	27,004,000	[2]	21,787,000	(127,124,000)	(83,536,000)	150,658,000		0	43,520,000	131,642,000	0	(138,631,000)	2,089,000	(102,147,000)	(1,437,000)	(4,715,000)	(8,248,000)	7,170,000	7,628,000	(14,006,000)	4,983,000	10,383,000	(2,723,000)	859,000	3,631,000	(127,124,000)	(83,536,000)	150,658,000
Statement of Financial Position [Abstract]
Current assets															0	0		0	0		3,380,000	31,411,000		14,833,000	17,674,000		1,038,000	8,911,000		13,252,000	19,594,000		32,503,000	77,590,000
Property and equipment, net	3,000,000					14,000,000					3,000,000	14,000,000			0	0		0	0		0	980,000		114,000	9,275,000		911,000	1,683,000		1,967,000	2,085,000		2,992,000	14,023,000
Goodwill and other identifiable intangible assets, net															0	0		0	0		0	142,792,000		2,109,000	4,996,000		13,959,000	22,330,000		3,845,000	7,825,000		19,913,000	177,943,000
Other assets															0	0		0	0		0	0		0	331,000		0	193,000		108,000	213,000		108,000	737,000
Total assets															0	0		0	0		3,380,000	175,183,000		17,056,000	32,276,000		15,908,000	33,117,000		19,172,000	29,717,000		55,516,000	270,293,000
Total liabilities															$ 0	$ 0		$ 0	$ 0		$ (2,210,000)	$ 11,440,000		$ 11,849,000	$ 9,386,000		$ 10,907,000	$ 12,005,000		$ 6,853,000	$ 7,331,000		$ 27,399,000	$ 40,162,000

[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.