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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value Measurements Of Financial Instruments [Line Items]            
Carrying value of investment in receivable portfolios $ 2,351,767 $ 2,038,407 $ 2,143,560 $ 1,987,985 $ 1,904,030 $ 1,590,249
Convertible senior notes, carrying value 448,500   448,500      
Unamortized debt discount 46,615   51,202      
Fair value estimate of convertible senior notes incorporates quoted market prices 501,300   507,400      
Senior secured notes, carrying value 36,250   43,750      
Senior secured notes, debt premium 62,406   67,259      
Cabot and Marlin Acquisitions [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Senior secured notes, carrying value 1,100,000   1,100,000      
Senior secured notes, debt premium 62,400   $ 67,300      
United States [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Increase or decrease of the fair value (100 basis points) $ 40,000          
United States [Member] | Cost to collect [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Estimated market participant cost to collect (percent) 50.30%          
United States [Member] | Discount rate [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Discount rate (percent) 12.00%          
Europe [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Increase or decrease of the fair value (100 basis points) $ 59,500          
Europe [Member] | Cost to collect [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Estimated market participant cost to collect (percent) 30.00%          
Europe [Member] | Discount rate [Member]            
Fair Value Measurements Of Financial Instruments [Line Items]            
Discount rate (percent) 12.50%