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Note Related party transactions (Corporation's equity in PRLP 2011 Holdings, LLC) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Equity Method Investments $ 228,072 $ 215,349
PRLP 2011 Holding, LLC    
Related Party Transaction [Line Items]    
Equity Method Investments $ 6,469 $ 7,199