Goodwill (Details) (USD $)	3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Data and analytics [Member]	Dec. 31, 2013 Data and analytics [Member]	Mar. 31, 2014 Mortgage origination services [Member]	Dec. 31, 2013 Mortgage origination services [Member]	Mar. 31, 2014 MSB/DQ Member [Domain]	Mar. 31, 2014 MSB/DQ Member [Domain] Data and analytics [Member]	Mar. 31, 2014 Terralink [Domain] Data and analytics [Member]	Mar. 31, 2014 Insignificant Acquisition [Domain] Data and analytics [Member]	Mar. 31, 2014 Swap [Member]	Sep. 30, 2012 Swap [Member]
Goodwill [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax											$ (100,000)	$ (300,000)
Goodwill [Roll Forward]
Goodwill		1,398,199,000		689,442,000		708,757,000
Accumulated impairment losses		(7,525,000)		(600,000)		(6,925,000)
Goodwill, net	1,765,932,000	1,390,674,000	1,034,200,000	688,842,000	731,732,000	701,832,000
Acquisitions	367,278,000		337,378,000		29,900,000		363,295,000	333,500,000	2,100,000	1,700,000
Translation adjustments	5,665,000		5,665,000		0
Goodwill, Other Changes	2,315,000		(2,315,000)		0
Goodwill, net	$ 1,765,932,000	$ 1,390,674,000	$ 1,034,200,000	$ 688,842,000	$ 731,732,000	$ 701,832,000