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Note Related party transactions (Proportionate share of income (loss) from PR Asset Portfolio 2013-1 International, LLC minority interest) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
PR Asset Portfolio 2013-1 International, LLC        
Related Party Transaction [Line Items]        
Income Loss From Equity Method Investments $ 112 $ (1,299) $ (5,297) $ (1,150)