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Supplemental Oil and Gas Reserve Information - Changes in Standardized Measure of Discounted Future Net Cash Flows Applicable to Proved Oil and Natural Gas Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Standardized Measure of Discounted Future Net Cash Flows
January 1,	$ 2,259,897	$ 1,319,471	$ 485,735
Net changes in prices and production costs	254,979	(7,814)	299,108
Net changes in future development costs	57,566	28,124	(38,244)
Sales of oil and natural gas, net	(857,540)	(542,515)	(262,485)
Purchases of reserves in place	858,382	15,890	2,679
Sales of reserves in place			(2,499)
Revisions of previous quantity estimates	99,954	(47,957)	(5,058)
Previously estimated development costs incurred	373,912	480,925	146,847
Accretion of discount	346,068	190,370	69,782
Net change in income taxes	(774,910)	(400,196)	(372,146)
Changes in timing and other	(1,951)	(134,880)	6,055
December 31,	3,727,559	2,259,897	1,319,471
Extensions [Member]
Standardized Measure of Discounted Future Net Cash Flows
Proved oil and gas reserves increase	$ 1,111,202	$ 1,358,479	$ 989,697

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves.

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