Investment in Receivable Portfolios, Net - Establishment of Negative Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Receivables [Abstract]
Purchase price	$ 142,728	$ 147,939	$ 312,906	$ 362,052
Allowance for credit losses	350,537	371,424	725,112	892,618
Amortized cost	493,265	519,363	1,038,018	1,254,670
Noncredit discount	658,358	786,512	1,442,470	1,754,227
Face value	1,151,623	1,305,875	2,480,488	3,008,897
Write-off of amortized cost	(493,265)	(519,363)	(1,038,018)	(1,254,670)
Write-off of noncredit discount	(658,358)	(786,512)	(1,442,470)	(1,754,227)
Negative allowance	142,728	147,939	312,906	362,052
Negative allowance for expected recoveries - current period purchases	$ 142,728	$ 147,939	$ 312,906	$ 362,052