Debt - Preferred Equity Certificates and Capital Lease Obligations (Details)	9 Months Ended						0 Months Ended						0 Months Ended						0 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 Preferred Equity Certificate [Member]	Jul. 02, 2013 Cabot Acquisition [Member]	Jul. 02, 2013 Janus Holdings [Member]	Jul. 02, 2013 Cabot Credit Management [Member] Janus Holdings [Member]	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] USD ($)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] GBP (£)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Bridge Preferred Equity Certificates [Member] USD ($)	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 ($)	Jul. 02, 2013 Cabot Acquisition [Member] Janus Holdings [Member] E Preferred Equity Certificates [Member] GBP (£)	Jul. 02, 2013 Common Class E [Member] Cabot Acquisition [Member] Janus Holdings [Member]	Jul. 02, 2013 Common Class A [Member] Cabot Acquisition [Member]	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Cabot Holdings [Member] Janus Holdings [Member] J Bridge PECs [Member] USD ($)	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Cabot Holdings [Member] Janus Holdings [Member] J Bridge PECs [Member] GBP (£)	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Cabot Holdings [Member] Janus Holdings [Member] J Preferred Equity Certificates [Member] USD ($)	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Cabot Holdings [Member] Janus Holdings [Member] J Preferred Equity Certificates [Member] GBP (£)	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Common Class A [Member] Cabot Holdings [Member]	Jul. 02, 2013 J C Flowers And Company Limited Liability Company [Member] Common Class J [Member] Cabot Holdings [Member] Janus Holdings [Member]
Debt Instrument [Line Items]
Business acquisition, percentage of equity interest				50.10%		50.10%
Business acquisition, face value									$ 15,500,000	£ 10,218,574	$ 147,100,000	£ 96,729,661			$ 15,500,000	£ 10,177,781
Business acquisition, number of shares acquired													3,498,563						100
Business Combination, Consideration Transferred							175,000,000	115,100,000
Noncontrolling interest, ownership percentage					49.90%
Equity certificates with a face value																	146,500,000	96,343,515
Business combination number of shares still held by minority interest														100						3,484,597
Debt instrument, stated interest rate			12.00%
Preferred equity certificates	210,891,000	199,821,000
Capital lease obligations	$ 15,274,000	$ 12,219,000
Debt instrument, interest rate, stated percentage rate range, minimum	0.00%
Debt instrument, interest rate, stated percentage rate range, maximum	12.50%