Supplemental Information On Oil And Gas Exploration And Production Activities (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended
	Dec. 31, 2013 MBoe	Dec. 31, 2012 MBoe	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2013 Diamondback Energy LLC [Member]	Jun. 30, 2012 Diamondback Energy LLC [Member]	Dec. 31, 2013 Diamondback Energy, Inc [Member]	Dec. 31, 2012 Diamondback Energy, Inc [Member] MBoe	Dec. 31, 2011 Diamondback Energy, Inc [Member]	Dec. 31, 2013 Oil [Member]	Dec. 31, 2013 Natural Gas Liquids [Member]
Reserve Quantities [Line Items]
Ownership interest						7.20%	21.40%	7.20%	21.40%
Future cash flows	$ 1,657,708,000		$ 954,833,000		$ 1,594,050,000			$ 331,505,000	$ 592,669,000	$ 0
Future development and abandonment costs	(272,500,000)		(159,113,000)		(306,810,000)			(37,229,000)	(115,869,000)	0
Future production costs	(274,428,000)		(147,024,000)		(295,383,000)			(58,096,000)	(165,553,000)	0
Future production taxes	(78,647,000)		(89,175,000)		(124,739,000)			(22,925,000)	(30,122,000)	0
Future income taxes	(172,691,000)		(114,867,000)		(229,649,000)			(48,547,000)	(71,669,000)	0
Future net cash flows	859,442,000		444,654,000		637,469,000			164,708,000	209,456,000	0
10% discount to reflect timing of cash flows	(280,976,000)		(96,013,000)		(260,788,000)			(94,462,000)	(130,871,000)	0
Standardized measure of discounted future net cash flows	578,466,000		348,641,000		376,681,000			70,246,000	78,585,000	0
Price per unit (usd per MMbls or MMcf)	3.67	91.32	2.76	4.12	96.19						96.78	41.23
Increase (decrease) in reserve during the period	27,805,000	6,675,000	6,675,000						(12,564,000)
Decrease in reserves relating to change in estimates		442,000	442,000
Future development costs estimated to be spend in 2014			135,400,000
Future development costs estimated to be spend in 2015			68,700,000
Future development costs estimated to be spend in 2016			$ 8,500,000