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Subsequent Events - Additional Information (Detail) (7.875% Senior Secured Notes, due July 15, 2019, HGI, USD $)
Sep. 30, 2013
Jul. 23, 2013
Dec. 30, 2012
Sep. 30, 2012
7.875% Senior Secured Notes, due July 15, 2019 | HGI
       
Subsequent Event [Line Items]        
Debt Instrument, Face Amount   $ 225,000,000 $ 700,000,000.0  
Long-term debt, interest rate 7.875%   7.875%   
Long-term debt, percentage   101.50% 99.36%