Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended			3 Months Ended			9 Months Ended				3 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Total [Member]	Sep. 30, 2011 Total [Member]	Sep. 30, 2012 Total [Member]	Sep. 30, 2011 Total [Member]	Dec. 31, 2011 Total [Member]	Sep. 30, 2012 Data and analytics [Member] Marketing [Member]	Sep. 30, 2011 Data and analytics [Member] Marketing [Member]	Sep. 30, 2012 Data and analytics [Member] Marketing [Member]	Sep. 30, 2011 Data and analytics [Member] Marketing [Member]	Dec. 31, 2011 Data and analytics [Member] Marketing [Member]	Sep. 30, 2012 Data and analytics [Member] Consumer [Member]	Sep. 30, 2011 Data and analytics [Member] Consumer [Member]	Sep. 30, 2012 Data and analytics [Member] Consumer [Member]	Sep. 30, 2011 Data and analytics [Member] Consumer [Member]	Dec. 31, 2011 Data and analytics [Member] Consumer [Member]	Sep. 30, 2012 Mortgage origination services [Member] Discontinued Operations Appraisal [Member]	Sep. 30, 2011 Mortgage origination services [Member] Discontinued Operations Appraisal [Member]	Dec. 31, 2011 Mortgage origination services [Member] Discontinued Operations Appraisal [Member]	Sep. 30, 2012 Default services [Member] Transportation [Member]	Sep. 30, 2011 Default services [Member] Transportation [Member]	Dec. 31, 2011 Default services [Member] Transportation [Member]	Sep. 30, 2012 Business and Information Services [Member] Discontinued Operations Appraisal [Member]	Sep. 30, 2011 Business and Information Services [Member] Discontinued Operations Appraisal [Member]	Sep. 30, 2012 Business and Information Services [Member] Transportation [Member]	Sep. 30, 2011 Business and Information Services [Member] Transportation [Member]	Sep. 30, 2012 Disposition of Transportation Services Business [Member]	Sep. 30, 2012 Disposition of Transportation Services Business [Member]	Aug. 31, 2012 Disposition of Transportation Services Business [Member]	Sep. 30, 2011 Impairment of Intangible Assets [Member] Discontinued Operations Appraisal [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of discontinued operations																																	$ 11,000,000
Gain on sale of discontinued operations, net of tax	12,264,000	0	9,277,000	0																											4,300,000	3,900,000
Disposal group, not discontinued operation, loss on write-down of goodwill																																		13,900,000
Prior period adjustment, increase to provision for income taxes, discontinued operations	4,100,000		4,100,000
Statement of Financial Position [Abstract]
Current assets						7,306,000		7,306,000		32,503,000	(269,000)		(269,000)		3,380,000	7,200,000		7,200,000		14,833,000	359,000		1,038,000	16,000		13,252,000
Property and equipment, net	400,000		400,000		3,000,000	389,000		389,000		2,992,000	0		0		0	83,000		83,000		114,000	306,000		911,000	0		1,967,000
Goodwill and other identifiable intangible assets, net										19,913,000					0					2,109,000			13,959,000			3,845,000
Other assets						2,121,000		2,121,000		108,000	40,000		40,000		0	2,081,000		2,081,000		0	0		0	0		108,000
Total assets						9,816,000		9,816,000		55,516,000	(229,000)		(229,000)		3,380,000	9,364,000		9,364,000		17,056,000	665,000		15,908,000	16,000		19,172,000
Total liabilities						19,812,000		19,812,000		27,399,000	1,411,000		1,411,000		(2,210,000)	5,572,000		5,572,000		11,849,000	12,146,000		10,907,000	683,000		6,853,000
Income Statement [Abstract]
Operating revenue						26,991,000	58,609,000	127,345,000	214,302,000		0	6,431,000	0	29,399,000		8,410,000	22,877,000	55,773,000	73,443,000		6,938,000	12,463,000		11,643,000	16,838,000		25,137,000	60,012,000	46,435,000	51,448,000
(Loss)/income from discontinued operation before income taxes						(7,511,000)	(168,968,000)	(20,094,000)	(180,476,000)		(66,000)	(152,675,000)	111,000	(166,342,000)		(348,000)	(13,384,000)	5,177,000	(7,603,000)		(7,121,000)	(3,066,000)		24,000	157,000		(23,675,000)	(7,741,000)	(1,707,000)	1,210,000
Income tax expense/(benefit)						2,646,000	(64,748,000)	(1,952,000)	(69,351,000)		3,972,000	(58,300,000)	4,041,000	(63,768,000)		(122,000)	(5,318,000)	2,030,000	(3,004,000)		(1,199,000)	(1,188,000)		(5,000)	58,000		(6,243,000)	(3,058,000)	(1,780,000)	479,000
(Loss)/income from discontinued operations, net of tax	$ (10,157,000)	$ (104,220,000)	$ (18,142,000)	$ (111,125,000)		$ (10,157,000)	$ (104,220,000)	$ (18,142,000)	$ (111,125,000)		$ (4,038,000)	$ (94,375,000)	$ (3,930,000)	$ (102,574,000)		$ (226,000)	$ (8,066,000)	$ 3,147,000	$ (4,599,000)		$ (5,922,000)	$ (1,878,000)		$ 29,000	$ 99,000		$ (17,432,000)	$ (4,683,000)	$ 73,000	$ 731,000