Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) (Results of Operations for Producing Activities) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) (Results of Operations for Producing Activities) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Results of Operations for Oil and Gas Producing Activities [Line Items]      
Revenues $ 708,990,000 $ 670,762,000 $ 262,225,000
Production costs (222,805,000) (140,664,000) (64,666,000)
Depletion (335,288,000) (263,946,000) (118,118,000)
Impairment (1,440,418,000) 0 0
Results of operations, before income taxes (1,289,521,000) 266,152,000 79,441,000
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current 0 0 0
Deferred (220,201,000) 96,061,000 49,447,000
Income tax expense (220,201,000) 96,061,000 49,447,000
Results of operations from producing activities (1,069,320,000) 170,091,000 29,994,000
Depletion per Mcf of gas equivalent (Mcfe) 1.68 3.01 4.78
Diamondback Energy, Inc      
Results of Operations for Oil and Gas Producing Activities [Line Items]      
Revenues 0 0 14,976,000
Production costs 0 0 (2,518,000)
Depletion 0 0 (4,754,000)
Results of operations, before income taxes 0 0 7,704,000
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Income tax expense 0 0 2,286,000
Results of operations from producing activities 0 0 5,418,000
Investment in Grizzly Oil Sands ULC      
Results of Operations for Oil and Gas Producing Activities [Line Items]      
Revenues 1,436,000 5,449,000 0
Production costs (1,549,000) (10,113,000) 0
Depletion (625,000) (1,195,000) 0
Results of operations, before income taxes (738,000) (5,859,000) 0
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Income tax expense 0 0 0
Results of operations from producing activities $ (738,000) $ (5,859,000) $ 0