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Operating Segments Narrative (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Entity
Dec. 31, 2013
Other Items
Dec. 31, 2012
Other Items
Dec. 31, 2013
Penn Mezzanine [Member]
Aug. 31, 2011
Penn Mezzanine [Member]
Segment Reporting Information [Line Items]          
Non-consolidated partner companies 22        
Ownership interest under equity method, percentage       36.00% 36.00%
Total assets included cash, cash equivalents, cash held in escrow and marketable securities   $ 183.7 $ 212.5