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Note Related party transactions (Corporation's equity in PR Asset Portfolio 2013-1 International, LLC) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Investment in equity investees $ 210,411 $ 218,062
PR Asset Portfolio 2013-1 International, LLC    
Related Party Transaction [Line Items]    
Investment in equity investees $ 19,165 $ 22,378