Investment in Receivable Portfolios, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Face value of receivable portfolios	$ 3,500,000	$ 1,000,000
Purchase price of receivable portfolios	$ 256,753	$ 125,154
Purchase cost as a percentage of face value	7.20%	12.00%
Estimated future collections at acquisition for receivable portfolios	$ 458,600	$ 197,500
Revenue recognized, net	270,094	264,110
Estimate of Zero Basis Cash Flows [Member]
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Revenue recognized, net	$ 31,547	$ 15,571