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Corporation's equity in PRLP 2011 Holdings, LLC (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Equity Method Investments $ 221,130 $ 197,006
Prlp2011 Holdings Llc Joint Venture [Member] | Gross [Member]
   
Related Party Transaction [Line Items]    
Equity Method Investments $ 24,112 $ 26,596