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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value inputs, fluctuation in cost to collect and discount rate 1.00%          
Carrying value of investment in receivable portfolios $ 2,469,593 $ 2,486,978 $ 2,440,669 $ 2,351,767 $ 2,038,407 $ 2,143,560
Convertible senior notes, carrying value 448,500   448,500      
Senior secured notes, carrying value $ 17,494   28,750      
United States [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market participant cost to collect 50.30%          
Discount rate 10.50%          
Increase or decrease of the fair value (100 basis points) $ 42,600          
Europe [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market participant cost to collect 30.00%          
Discount rate 12.10%          
Increase or decrease of the fair value (100 basis points) $ 53,300          
Other Geographies [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market participant cost to collect 32.30%          
Discount rate 11.00%          
Senior Notes [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Convertible senior notes, carrying value $ 411,500   406,600      
Senior Notes [Member] | Level 2 [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value estimate of convertible senior notes incorporates quoted market prices 354,400   372,200      
Secured Debt [Member] | Cabot Senior Secured Notes [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior secured notes, carrying value 1,300,000   1,400,000      
Secured Debt [Member] | Level 2 [Member] | Cabot Senior Secured Notes [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of senior notes $ 1,300,000   $ 1,400,000