Investment in Affiliates, Net (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended			1 Months Ended		8 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Joint Venture Loan Originations Products and Services [Member]	Dec. 31, 2011 Joint Venture Loan Originations Products and Services [Member]	Dec. 31, 2010 Joint Venture Loan Originations Products and Services [Member]	Aug. 31, 2012 Lone Wolf Real Estate Technologies, Inc. [Member]	Dec. 31, 2012 Lone Wolf Real Estate Technologies, Inc. [Member]	Mar. 31, 2011 STARS [Member] Y	Dec. 31, 2012 STARS [Member]	Jul. 31, 2012 RELS Reporting Services, LLC [Member]	Dec. 31, 2012 RELS Reporting Services, LLC [Member]	Jun. 30, 2012 RELS Reporting Services, LLC [Member]	Dec. 31, 2010 Dorado Network Systems [Member]	May 31, 2011 RP Data [Member]	Mar. 31, 2011 Acquisition Notes [Member] STARS [Member] Installments	Dec. 31, 2012 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member]	Dec. 31, 2011 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member]	Jul. 31, 2012 Customer lists [Member] RELS Reporting Services, LLC [Member] Y	Jan. 31, 2011 Customer lists [Member] Dorado Network Systems [Member] Y	Dec. 31, 2011 Customer lists [Member] RP Data [Member] Y
Schedule of Investments [Line Items]
Income tax on equity earnings of affiliates	$ 22,100,000	$ 19,200,000	$ 27,700,000
Proceeds from dividends on equity method investments	70,666,000	42,929,000	64,603,000
Equity method investment, ownership percentage				50.10%				29.80%	50.10%				50.10%	39.00%	40.20%
Joint venture investment percentage of income in equity earnings of affiliates, net of tax				73.30%	86.50%	90.20%
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Proceeds from sale of equity method investments							8,000,000
Realized gain on disposal of equity method investment								2,200,000
Business acquisition, cost of acquired entity, purchase price											3,000,000
Dividends received from investments in affiliates											1,500,000
Loss on equity method investment												1,200,000
Aggregate cost of equity method investment									35,000,000
Payments to acquire interest in joint venture									20,000,000	20,000,000
Joint venture purchase price, note payable																15,000,000
Number of installment payments to acquire joint venture interest																3
Joint venture, deferred installment payments										5,000,000
Long-term debt	792,426,000	908,295,000															8,753,000	13,209,000
Equity method investment, difference between carrying amount and underlying equity									30,800,000
Acquired indefinite-lived intangible asset, amount									9,700,000
Acquired finite-lived intangible asset, amount									21,100,000										3,100,000
Acquired finite-lived intangible asset, weighted average useful life									9.3										3.0	12	8
Business acquisition, preexisting relationship, gain (loss) recognized														$ (14,500,000)	$ 58,900,000