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Note Related party transactions (Proportionate share of income (loss) from PRLP 2011 Holdings, LLC minority interest) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]        
Income Loss From Equity Method Investments     $ 23,812 $ 17,085
PRLP 2011 Holding, LLC        
Related Party Transaction [Line Items]        
Income Loss From Equity Method Investments $ 511 $ (633) $ (83) $ (2,463)