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Goodwill and Identifiable Intangible Assets - Schedule of Reportable Segments by Reporting Units (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]      
Beginning Balance $ 897,933    
Goodwill acquired 114,730    
Goodwill impairment (49,277) $ 0 $ 0
Effect of foreign currency translation (40,949)    
Ending Balance 924,847 897,933  
Additional tax related obligations assumed 2,410    
Portfolio Purchasing and Recovery [Member]      
Goodwill [Roll Forward]      
Beginning Balance 848,656    
Goodwill acquired 114,730    
Goodwill impairment 0    
Effect of foreign currency translation (40,949)    
Ending Balance 924,847 848,656  
Additional tax related obligations assumed 2,410    
Tax Lien Transfer [Member]      
Goodwill [Roll Forward]      
Beginning Balance 49,277    
Goodwill acquired 0    
Goodwill impairment (49,277)    
Effect of foreign currency translation 0    
Ending Balance 0 $ 49,277  
Additional tax related obligations assumed $ 0