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Segment Information - Additional Information (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]    
Number of reportable segments | Segment 2  
Assets $ 4,103,010 $ 3,750,135
Portfolio Purchasing and Recovery [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,700,000  
Tax Lien Transfer [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 411,200