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Goodwill and Identifiable Intangible Assets - Narrative (Detail)
$ in Thousands
12 Months Ended
Feb. 19, 2016
Dec. 31, 2015
USD ($)
reporting_unit
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Number of reporting units | reporting_unit   6      
Amortization expense   $ 5,000 $ 3,600 $ 800  
Goodwill impairment   $ 49,277 $ 0 $ 0  
Portfolio Purchasing and Recovery [Member]          
Finite-Lived Intangible Assets [Line Items]          
Number of reporting units | reporting_unit   5      
Goodwill impairment   $ 0      
Tax Lien Transfer [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment   49,277      
Propel [Member] | Tax Lien Transfer [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment   $ 49,300      
Propel [Member] | Subsequent Event [Member]          
Finite-Lived Intangible Assets [Line Items]          
Percentage of membership interest 100.00%        
Scenario, Forecast [Member] | Propel [Member]          
Finite-Lived Intangible Assets [Line Items]          
Enterprise value         $ 344,300
Consideration payable to Company         $ 142,800