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Fair Value Measurements - Additional Information (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
subsidiary
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fluctuation in cost to collect rate 1.00%   1.00%      
Fluctuation in discount rate 1.00%   1.00%      
Carrying value of investment in receivable portfolios $ 2,323,224 $ 2,351,767 $ 2,143,560 $ 2,073,232 $ 1,987,985 $ 1,590,249
Convertible senior notes, carrying value 448,500   448,500      
Unamortized debt discount 44,255   51,202      
Fair value estimate of convertible senior notes incorporates quoted market prices 451,900   507,400      
Senior secured notes, carrying value 32,500   43,750      
Senior secured notes, debt premium $ 57,387   67,259      
Number of subsidiaries | subsidiary 2          
Cabot and Marlin Acquisitions [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior secured notes, carrying value $ 1,100,000   1,100,000      
Senior secured notes, debt premium $ 57,400   $ 67,300      
United States [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market participant cost to collect 50.30%          
Discount rate 12.00%          
Increase or decrease of the fair value (100 basis points) $ 41,200          
Europe [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market participant cost to collect 30.00%          
Discount rate 13.40%          
Increase or decrease of the fair value (100 basis points) $ 57,500