Fair Value Measurements - Financial Instruments Not Required to be Carried at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Carrying Amount
Financial Assets
Investment in receivable portfolios, net	$ 3,330,986	$ 3,088,261
Carrying Amount | Global senior secured revolving credit facility
Financial Liabilities
Debt instrument, fair value disclosure	850,689	661,738
Carrying Amount | Cabot securitisation senior facility
Financial Liabilities
Debt instrument, fair value disclosure	443,828	423,522
Carrying Amount | Encore private placement notes
Financial Liabilities
Debt instrument, fair value disclosure	48,850	68,390
Carrying Amount | Senior secured notes
Financial Liabilities
Debt instrument, fair value disclosure	1,527,085	1,480,258
Carrying Amount | 2023 Exchangeable Notes
Financial Liabilities
Debt instrument, fair value disclosure	17,655	172,500
Carrying Amount | 2025 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	100,000	100,000
Carrying Amount | 2029 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	230,000	0
Estimated Fair Value
Financial Assets
Investment in receivable portfolios, net	3,426,757	3,242,506
Estimated Fair Value | Global senior secured revolving credit facility
Financial Liabilities
Debt instrument, fair value disclosure	850,689	661,738
Estimated Fair Value | Cabot securitisation senior facility
Financial Liabilities
Debt instrument, fair value disclosure	443,828	423,522
Estimated Fair Value | Encore private placement notes
Financial Liabilities
Debt instrument, fair value disclosure	48,000	66,947
Estimated Fair Value | Senior secured notes
Financial Liabilities
Debt instrument, fair value disclosure	1,375,574	1,334,686
Estimated Fair Value | 2023 Exchangeable Notes
Financial Liabilities
Debt instrument, fair value disclosure	19,690	205,227
Estimated Fair Value | 2025 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	131,878	130,556
Estimated Fair Value | 2029 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	$ 225,188	$ 0