Debt - Encore Revolving Credit Facility and Term Loan Facility (Detail) (USD $)	0 Months Ended			0 Months Ended			0 Months Ended		0 Months Ended
	Aug. 01, 2014 subtranche	Sep. 30, 2014	Dec. 31, 2013	Aug. 01, 2014 Restated Credit Agreement [Member]	Aug. 01, 2014 Revolving Credit Facility [Member]	Aug. 01, 2014 Foreign Portfolio Investment Basket [Member]	Aug. 01, 2014 Term Loan One [Member]	Aug. 01, 2014 Term Loan [Member]	Aug. 01, 2014 Term Loan Subtranche One [Member]	Aug. 01, 2014 Term loan Subtranche Two [Member]	Aug. 01, 2014 Base Rate [Member] Revolving Credit Facility [Member] Minimum [Member]	Aug. 01, 2014 Base Rate [Member] Revolving Credit Facility [Member] Maximum [Member]	Aug. 01, 2014 Base Rate [Member] Term Loan One [Member] Minimum [Member]	Aug. 01, 2014 Base Rate [Member] Term Loan One [Member] Maximum [Member]	Aug. 01, 2014 Base Rate [Member] Term Loan Subtranche One [Member] Minimum [Member]	Aug. 01, 2014 Base Rate [Member] Term Loan Subtranche One [Member] Maximum [Member]	Aug. 01, 2014 Base Rate [Member] Term loan Subtranche Two [Member] Minimum [Member]	Aug. 01, 2014 Base Rate [Member] Term loan Subtranche Two [Member] Maximum [Member]	Aug. 01, 2014 LIBOR [Member] Revolving Credit Facility [Member] Minimum [Member]	Aug. 01, 2014 LIBOR [Member] Revolving Credit Facility [Member] Maximum [Member]	Aug. 01, 2014 LIBOR [Member] Term Loan One [Member] Minimum [Member]	Aug. 01, 2014 LIBOR [Member] Term Loan One [Member] Maximum [Member]	Aug. 01, 2014 LIBOR [Member] Term Loan Subtranche One [Member] Minimum [Member]	Aug. 01, 2014 LIBOR [Member] Term Loan Subtranche One [Member] Maximum [Member]	Aug. 01, 2014 LIBOR [Member] Term loan Subtranche Two [Member] Minimum [Member]	Aug. 01, 2014 LIBOR [Member] Term loan Subtranche Two [Member] Maximum [Member]	Aug. 01, 2014 Propel [Member]	Sep. 30, 2014 Quarter To Date [Member]	Sep. 30, 2013 Quarter To Date [Member]	Sep. 30, 2014 Year To Date [Member]	Sep. 30, 2013 Year To Date [Member]
Debt Instrument [Line Items]
Revolving credit facility					$ 692,600,000.0
Term loan facility		147,984,000	140,625,000				87,500,000	153,800,000	60,000,000	6,300,000
Additional line of revolving credit facility					250,000,000
Maximum borrowing capacity including accordion agreement after amendment				1,100,000,000.0
Debt instrument, term				5 years			5 years
Line of credit facility expiry date				Feb. 28, 2019					Feb. 25, 2017	Nov. 03, 2017
Debt Instrument, Number of Subtranches	2
Basis spread on variable rate											1.50%	2.00%	1.50%	2.00%	1.00%	1.50%	1.50%	2.00%	2.50%	3.00%	2.50%	3.00%	2.00%	2.50%	2.50%	3.00%
Percentage to be added to base rate for alternate base rate	0.50%
Percentage to be added to adjusted base rate for alternate base rate	1.00%
Principal amount amortized, 2014							4,400,000		3,000,000	400,000
Principal amount amortized, 2015							4,400,000		3,000,000	500,000
Principal amount amortized, 2016							6,600,000		4,500,000	600,000
Principal amount amortized, 2017							8,800,000			500,000
Principal amount amortized, 2018							8,800,000
Borrowing base as percentage of eligible estimated collection range start	30.00%
Borrowing base as percentage of eligible estimated collection range end	35.00%
Percentage of eligible estimated remaining collections	33.00%
Eligible estimated remaining collections for consumer receivables	55.00%
Percentage of multiplying factor	95.00%
Allowance of additional unsecured indebtedness	750,000,000
Company's repurchases, common stock	50,000,000.0
Percentage of acquisitions excluded	50.00%
Acquisition limit	225,000,000
Investments in unrestricted subsidiaries	250,000,000																										200,000,000
Acquisition limit per acquisition						150,000,000
Amount outstanding		$ 577,000,000
Revolving credit facility, interest rate																												2.95%	3.07%	2.92%	3.13%