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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Variable Interest Entity        
Cash and cash equivalents $ 1,094,341 $ 309,766 $ 421,073 $ 207,681
Accounts receivable 412,140 445,506    
Derivative contracts 53,424 71,022    
Total current assets 1,641,990 1,142,885    
Investment in royalty interests 10,890,973 13,128,784    
Less accumulated depreciation, depletion and impairment (5,515,168) (5,231,182)    
Investment in royalty interests, net 5,375,805 7,897,602    
Derivative contracts 43,173 23,617    
Accounts payable and accrued expenses 746,944 766,544    
Royalty Trusts
        
Variable Interest Entity        
Cash and cash equivalents 7,293 [1] 7,445 [1]    
Accounts receivable 28,620 28,596    
Derivative contracts 9,864 10,286    
Total current assets 45,777 46,327    
Investment in royalty interests 1,325,942 [2] 1,325,942 [2]    
Less accumulated depreciation, depletion and impairment (148,009) (103,746)    
Investment in royalty interests, net 1,177,933 1,222,196    
Derivative contracts 7,594 7,660    
Total assets 1,231,304 1,276,183    
Accounts payable and accrued expenses 3,081 1,101    
Total liabilities $ 3,081 $ 1,101    
[1] Includes $3.0 million held by the trustee at June 30, 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.