Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows $ 1,657,708 $ 954,833 $ 1,594,050
Future development and abandonment costs (272,500) (159,113) (306,810)
Future production costs (274,428) (147,024) (295,383)
Future production taxes (78,647) (89,175) (124,739)
Future income taxes (172,691) (114,867) (229,649)
Future net cash flows 859,442 444,654 637,469
10% discount to reflect timing of cash flows (280,976) (96,013) (260,788)
Standardized measure of discounted future net cash flows 578,466 348,641 376,681
Diamondback Energy, Inc [Member]
     
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows 331,505 592,669 0
Future development and abandonment costs (37,229) (115,869) 0
Future production costs (58,096) (165,553) 0
Future production taxes (22,925) (30,122) 0
Future income taxes (48,547) (71,669) 0
Future net cash flows 164,708 209,456 0
10% discount to reflect timing of cash flows (94,462) (130,871) 0
Standardized measure of discounted future net cash flows $ 70,246 $ 78,585 $ 0