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Note Related party transactions (Proportionate share of income (loss) from PRLP 2011 Holdings, LLC minority interest) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Income Loss From Equity Method Investments $ 38,000 $ 34,100  
PRLP 2011 Holding, LLC      
Related Party Transaction [Line Items]      
Income Loss From Equity Method Investments $ (356) $ (972) $ (502)