Investment in Receivable Portfolios, Net - Summary of Changes in Balance of Investment in Receivable Portfolios (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Balance, beginning of period	$ 3,283,984	$ 3,137,893	$ 2,890,613
Purchases of Receivable Portfolios	659,872	1,046,696	1,131,898
Deconsolidation of receivable portfolios	(2,822)	(51,935)	0
Put-backs and Recalls	(15,824)	(11,591)	(14,429)
Disposals and transfers to real estate owned	(9,459)	(11,495)	(12,456)
Sale of receivable portfolios	0	(98,636)	0
Cash collections	(2,111,848)	(2,026,928)	(1,967,620)
Revenue from receivable portfolios	1,374,717	1,269,288	1,167,132
Changes in expected current period recoveries	228,075	0	0
Changes in expected future period recoveries	(220,829)	0	0
Portfolio (allowance) reversals, net	0	(8,108)	41,473
Foreign currency adjustments	61,886	38,800	(98,718)
Balance, end of period	3,291,918	3,283,984	$ 3,137,893
Adjusted Balance
Loans and Leases Receivable Disclosure [Line Items]
Balance, beginning of period	$ 3,328,150
Balance, end of period		$ 3,328,150