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Supplementary Information - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Future cash inflows	$ 1,880,389	$ 1,524,137
Future production costs	(769,172)	(673,629)
Future development costs	(313,754)	(179,568)
Future income tax expenses	(234,191)	(186,072)
Future Net Cash Flows	563,272	484,868
10% annual discount for estimated timing of cash flows	(325,044)	(271,595)
Standardized Measure of Discounted Future Net Cash Flows	$ 238,228	$ 213,273

X

- Definition

This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows relating to proved oil and gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 30

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447



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- Definition

Amount of estimated future cash inflows from sale of proved oil and gas reserves.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of estimated future cost to be incurred in developing proved oil and gas reserves.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of estimated future income tax expense to be incurred based on the future income less future expense derived from production and sale of proved oil and gas reserves.

+ References

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-Publisher FASB

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Amount of estimated net future cash inflows, after subtracting future development and production costs and future income tax expenses, from sale of proved oil and gas reserves.

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Amount of estimated future cost to be incurred in producing proved oil and gas reserves.

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This amount is the future net cash flows less the computed discount.

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