Ownership, Description of Business, and Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage of payment made for portfolios purchase	50.00%
AACC Merger [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Business acquisition, date of acquisition	Jun. 13, 2013
Cabot Acquisition [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Business acquisition, date of acquisition	Jul. 01, 2013
Marlin [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Business acquisition, date of acquisition	Feb. 07, 2014
Atlantic Credit and Finance, Inc. [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Business acquisition, date of acquisition	Aug. 06, 2014