Debt - Additional Information 4 (Detail)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended				0 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended							0 Months Ended		6 Months Ended		0 Months Ended						0 Months Ended							0 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2014 After Amendment [Member] USD ($)	Jun. 30, 2014 Warrants [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member]	Jul. 02, 2013 Janus Holdings [Member]	Nov. 27, 2012 2017 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2014 2017 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2013 2017 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2014 2017 Convertible Senior Notes [Member] USD ($)	Dec. 31, 2013 2017 Convertible Senior Notes [Member] D	Feb. 06, 2014 2017 Convertible Senior Notes [Member]	Dec. 31, 2012 2017 Convertible Senior Notes [Member]	Dec. 06, 2012 2017 Convertible Senior Notes [Member] USD ($)	Dec. 16, 2013 2017 Convertible Senior Notes [Member] Before Amendment [Member]	Dec. 31, 2012 2017 Convertible Senior Notes [Member] Before Amendment [Member]	Dec. 16, 2013 2017 Convertible Senior Notes [Member] After Amendment [Member]	Jun. 25, 2013 2020 Convertible Senior Notes [Member] USD ($)	Jun. 25, 2013 2020 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2014 2020 Convertible Senior Notes [Member] USD ($)	Jul. 18, 2013 2020 Convertible Senior Notes [Member] USD ($)	Mar. 05, 2014 2021 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2014 2021 Convertible Senior Notes [Member] USD ($)	Mar. 06, 2014 2021 Convertible Senior Notes [Member] USD ($)	Jun. 30, 2014 Preferred Equity Certificate [Member]	Jun. 30, 2014 Propel Facility II [Member] USD ($)	Jul. 02, 2013 Cabot Credit Management [Member] Janus Holdings [Member]	Jul. 02, 2013 Cabot Holdings [Member] Common Class A [Member] J C Flowers And Company Limited Liability Company [Member]	Jul. 02, 2013 Cabot Holdings [Member] Janus Holdings [Member] Common Class J [Member] J C Flowers And Company Limited Liability Company [Member]	Jul. 02, 2013 Cabot Holdings [Member] Janus Holdings [Member] J Bridge PECs [Member] J C Flowers And Company Limited Liability Company [Member] USD ($)	Jul. 02, 2013 Cabot Holdings [Member] Janus Holdings [Member] J Bridge PECs [Member] J C Flowers And Company Limited Liability Company [Member] GBP (£)	Jul. 02, 2013 Cabot Holdings [Member] Janus Holdings [Member] J Preferred Equity Certificates [Member] J C Flowers And Company Limited Liability Company [Member] USD ($)	Jul. 02, 2013 Cabot Holdings [Member] Janus Holdings [Member] J Preferred Equity Certificates [Member] J C Flowers And Company Limited Liability Company [Member] GBP (£)	Dec. 31, 2013 Cabot Acquisition [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member] Common Class A [Member]	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] GBP (£)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] Common Class E [Member]	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Bridge Preferred Equity Certificates [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Bridge Preferred Equity Certificates [Member] GBP (£)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Preferred Equity Certificates [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Preferred Equity Certificates [Member] GBP (£)
Debt Instrument [Line Items]
Encore revolving credit facility	$ 274,000,000		$ 274,000,000		$ 356,000,000																								$ 49,300,000
Encore senior secured notes	51,250,000		51,250,000		58,750,000																																646,900,000
Basis spread over the current Treasury Rate			0.50%
Convertible senior notes sold										100,000,000							15,000,000				150,000,000	150,000,000		22,500,000.0	140,000,000.0		21,000,000.0
Debt instrument, stated interest rate										3.00%											3.00%	3.00%			2.875%			12.00%
Convertible senior notes, Maturity date										Nov. 27, 2017												Jul. 01, 2020
Convertible senior notes outstanding	448,500,000		448,500,000		287,500,000					115,000,000														172,500,000.0			161,000,000.0
Debt instrument interest payment date													Interest on the 2017 Convertible Notes is payable semi-annually, in arrears, on May 27 and November 27 of each year										Interest on the 2020 Convertible Notes is payable semi-annually, in arrears, on January 1 and July 1 of each year
Initial conversion rate										31.6832												21.8718			16.8386
Convertible senior notes, principal amount										1,000											1,000	1,000			1,000
Initial conversion price per share										$ 31.56	$ 31.56		$ 31.56								$ 45.72	$ 45.72	$ 45.72		$ 59.39	$ 59.39
Fair value of notes										100,300,000	185,000,000		185,000,000								140,200,000	140,200,000			143,600,000
Residual value	53,821,000		53,821,000		46,954,000					14,700,000											32,300,000	32,300,000			17,400,000
Debt issuance cost										3,300,000											4,900,000				4,700,000
Initial debt issuance costs										3,800,000											6,000,000				5,300,000
Equity issuance cost										500,000											1,100,000				600,000
Event of early conversion, percentage of conversion price														130.00%
Event of early conversion, period stock price exceeds conversion price, trading days														20
Event of early conversion, term prior to period end stock price exceeds conversion price, consecutive trading days														30 days
Redeemable equity component of convertible senior notes			10,488,000
Dilutive effect of convertible senior notes (in shares)	1,043,000	40,000	1,195,000	0							1,000,000	100,000	1,200,000										100,000
Average price of common stock (in dollars per share)											$ 31.56	$ 31.56	$ 31.56
Effective conversion price of Notes per share											$ 44.19		$ 44.19
Warrants strike price (in dollars per share)																		44.19	44.19	60.00
Number of warrants modified											358,000		358,000		3,300,000	3,600,000
Amount paid to modify warrants, per warrant (in dollars per share)							$ 7.66
Amount paid to modify warrants						27,900,000
Warrant restrike costs			25,200,000		2,700,000
Capped Call Transactions cost																							18,100,000		19,500,000
Cap price of capped call transactions per share																							$ 61.5475		$ 83.1425
Proceeds from sale of notes			161,000,000	150,000,000																			167,400,000		155,700,000
Net proceeds used for payment of convertible note hedge transaction cost																							18,100,000		19,500,000
Effective interest rate on the liability component											6.00%		6.00%										6.35%			4.70%
Percentage of equity interest acquired								50.10%																						50.10%
Minority interest percentage									49.90%
Preferred equity certificates	217,858,000		217,858,000		199,821,000
Capital lease obligations	13,551,000		13,551,000		12,219,000
Capital lease obligations, minimum percentage			0.00%
Capital lease obligations, maximum percentage			8.97%
Face value of preferred equity certificates																																	15,500,000	10,177,781								15,500,000	10,218,574	147,100,000	96,729,661
Preferred equity certificates acquired, shares																															100										3,498,563
Aggregate purchase price																																							175,000,000	115,100,000
Face value of preferred equity certificates, still held by minority interest																																			$ 146,500,000	£ 96,343,515
Preferred equity certificates, still held by minority interest (in shares)																																3,484,597						100