Segment Information - Narrative (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]
Number of reportable segments | Segment	2
Assets	$ 4,219,852	$ 3,750,135
Portfolio Purchasing and Recovery [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,800,000
Tax Lien Transfer [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 400,000