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Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2012
Debt financing [Member]
Nov. 08, 2012
Subsequent Event [Member]
Nov. 16, 2012
6.375% Senior Notes due 2020 [Member]
Subsequent Event [Member]
Nov. 16, 2012
6.625% Senior Notes due 2022 [Member]
Subsequent Event [Member]
Sep. 30, 2012
EXCO [Member]
Sep. 30, 2012
HGI [Member]
Sep. 30, 2012
HGI and EXCO [Member]
Subsequent Event [Line Items]                    
Acquisition agreement date Oct. 08, 2012                  
HHI Business Contracted Purchase Price $ 1,400,000,000                  
Termination fee 78,000,000                  
Senior Notes, aggregate principal amount           520,000,000 570,000,000      
Senior Notes, interest rate           6.375% 6.625%      
Senior Notes, maturity date           2020 2022      
Debt financing commitments       1,840,000,000            
Cash acquisition 185,067,000 (684,417,000) 2,577,000   50,000,000          
Business acquisition, percentage of equity interests acquired         56.00%          
Total consideration to purchase and operate production of oil and Gas               725,000,000    
Acquisition of oil and gas assets               725,000,000    
Acquisition of oil and gas assets through bank debts 225,000,000                  
Acquisition of oil and gas assets through cash                 372,500,000,000  
Acquisition of oil and gas assets through oil and gas properties and related assets               127,500,000    
Receipt of limited partnership interest                 75.00%  
Receipt of interest in the general partner of partnership 50.00%                  
Own interest in partnership                 2.00%  
Total equity interest in partnership                 74.50%  
Cash proceeds from limited partner interest               $ 597,500,000,000    
Cash proceeds percentage from limited partner interest               25.00%    
Cash proceeds percentage from member interest                   50.00%
Percentage of equity interest in partnership               25.50%    
Percentage of member interest in general partner                   50.00%