Investment in Receivable Portfolios, Net - Summary of Accretable Yield and an Estimate of Zero Basis Future Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net [Line Items]
Beginning Balance	$ 1,002,310	$ 854,203
Revenue recognized, net	(744,852)	(545,412)
Net additions on existing portfolios	375,407	240,173
Additions for current purchases	1,767,071	453,346
Ending Balance	2,399,936	1,002,310
Accretable Yield [Member]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net [Line Items]
Beginning Balance	984,944	821,527
Revenue recognized, net	(717,733)	(519,136)
Net additions on existing portfolios	357,189	229,207
Additions for current purchases	1,767,071	453,346
Ending Balance	2,391,471	984,944
Estimate of Zero Basis Cash Flows [Member]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net [Line Items]
Beginning Balance	17,366	32,676
Revenue recognized, net	(27,119)	(26,276)
Net additions on existing portfolios	18,218	10,966
Additions for current purchases
Ending Balance	$ 8,465	$ 17,366