Fair Value Measurements - Schedule of Financial Instruments Not Required to Be Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in receivable portfolios, net	$ 3,468,432	$ 3,088,261
Carrying Amount | Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	24,904	23,512
Carrying Amount | Global senior secured revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	816,880	661,738
Carrying Amount | Encore private placement notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	29,310	68,390
Carrying Amount | Senior secured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	1,649,621	1,480,258
Carrying Amount | Exchangeable senior notes due September 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	0	172,500
Carrying Amount | Convertible senior notes due October 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	100,000	100,000
Carrying Amount | Convertible senior notes due March 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	230,000	0
Carrying Amount | Cabot securitisation senior facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	324,646	423,522
Carrying Amount | U.S. facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	175,000	0
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in receivable portfolios, net	3,515,651	3,242,506
Estimated Fair Value | Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	24,904	23,512
Estimated Fair Value | Global senior secured revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	816,880	661,738
Estimated Fair Value | Encore private placement notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	28,922	66,947
Estimated Fair Value | Senior secured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	1,598,636	1,334,686
Estimated Fair Value | Exchangeable senior notes due September 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	0	205,227
Estimated Fair Value | Convertible senior notes due October 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	136,403	130,556
Estimated Fair Value | Convertible senior notes due March 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	226,794	0
Estimated Fair Value | Cabot securitisation senior facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	324,646	423,522
Estimated Fair Value | U.S. facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	$ 175,000	$ 0