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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 1,308,733,000 $ 309,766,000 $ 127,842,000 $ 207,681,000
Accounts receivable 389,399,000 445,506,000    
Derivative contracts 25,693,000 71,022,000    
Total current assets 1,789,158,000 1,142,885,000    
Derivative contracts 25,219,000 23,617,000    
Accounts payable and accrued expenses 672,372,000 766,544,000    
Royalty Trusts
        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 6,277,000 [1] 7,445,000 [1]    
Accounts receivable 27,019,000 28,596,000    
Derivative contracts 6,334,000 10,286,000    
Total current assets 39,630,000 46,327,000    
Investment in royalty interests 1,325,942,000 [2] 1,325,942,000 [2]    
Less: accumulated depletion (125,322,000) (103,746,000)    
Investment in royalty interests, net 1,200,620,000 1,222,196,000    
Derivative contracts 5,931,000 7,660,000    
Total assets 1,246,181,000 1,276,183,000    
Accounts payable and accrued expenses 2,004,000 1,101,000    
Total liabilities $ 2,004,000 $ 1,101,000    
[1] Includes $3.0 million held by the trustee at March 31, 2013 and December 31, 2012 as reserves for future general and administrative expenses.
[2] Investment in royalty interests is included in oil and natural gas properties in the accompanying unaudited condensed consolidated balance sheets, and was determined by allocating the historical net book value of the Company’s full cost pool based on the fair value of each Royalty Trust’s royalty interests relative to the fair value of the Company’s full cost pool.