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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)

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