Investment in Affiliates, Net (Details)	12 Months Ended				3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		3 Months Ended		9 Months Ended	12 Months Ended		1 Months Ended		1 Months Ended					1 Months Ended		8 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2013	Dec. 31, 2012 Joint Venture Loan Originations Products and Services [Member]	Dec. 31, 2013 Joint Venture Loan Originations Products and Services [Member] USD ($)	Dec. 31, 2012 Joint Venture Loan Originations Products and Services [Member] USD ($)	Dec. 31, 2011 Joint Venture Loan Originations Products and Services [Member] USD ($)	Aug. 31, 2012 Lone Wolf Real Estate Technologies, Inc. [Member] USD ($)	Dec. 31, 2013 Lone Wolf Real Estate Technologies, Inc. [Member] USD ($)	Mar. 31, 2011 STARS [Member] USD ($)	Dec. 31, 2013 STARS [Member] USD ($)	Dec. 31, 2011 STARS [Member] USD ($)	Sep. 30, 2013 PIQ Acquisition [Member] USD ($)	Sep. 30, 2013 PIQ Acquisition [Member] NZD	Sep. 30, 2013 PIQ Acquisition [Member] USD ($)	Dec. 31, 2013 PIQ Acquisition [Member]	Sep. 01, 2013 PIQ Acquisition [Member]	Mar. 31, 2011 Dorado Network Systems [Member] USD ($)	Dec. 31, 2010 Dorado Network Systems [Member] USD ($)	May 31, 2011 RP Data [Member] USD ($)	May 31, 2011 RP Data [Member] AUD	Mar. 31, 2011 Acquisition Notes [Member] STARS [Member] USD ($) Installments	Dec. 31, 2013 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member] USD ($)	Dec. 31, 2012 Non Interest Bearing Acquisition Note [Member] Acquisition Notes [Member] USD ($)	Jan. 31, 2011 Customer Lists [Member] Dorado Network Systems [Member]	Mar. 31, 2011 Customer Lists [Member] Dorado Network Systems [Member] USD ($)	Dec. 31, 2011 Customer Lists [Member] RP Data [Member]	May 31, 2011 Customer Lists [Member] RP Data [Member] USD ($)
Schedule of Investments [Line Items]
Income from continuing operations attributable to RELS LLC						$ 64,384,000	$ 81,343,000	$ 75,443,000
Income tax on equity earnings of affiliates	16,500,000	(22,100,000)	(19,200,000)
Proceeds from dividends on equity method investments	36,680,000	70,666,000	42,929,000
Equity method investment, ownership percentage						50.10%				29.80%	50.10%									39.00%	40.20%	40.20%
Joint venture investment percentage of income in equity earnings of affiliates, net of tax					76.00%	72.80%		88.30%
Noncontrolling Interest, Ownership Percentage by Parent	100.00%			60.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain																6,600,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage																		10.00%
Proceeds from sale of equity method investments									8,000,000
Realized gain on disposal of equity method investment										2,200,000
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	839,930,000	792,426,000																						9,276,000	8,753,000
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
Acquired finite-lived intangible asset, weighted average useful life											9 years 3 months 18 days						15 years									12 years		8 years
Business acquisition, preexisting relationship, gain (loss) recognized																				(14,500,000)	58,900,000
Income from discontinued operations						0	7,050,000	11,613,000
Payments to Acquire Businesses, Gross														2,600,000	3,300,000				31,600,000		157,200,000	147,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles														$ 3,500,000		$ 3,500,000											$ 20,400,000		$ 46,700,000