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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	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Future cash inflows	$ 293,745	$ 2,252,248
Future production costs	(191,227)	(738,531)
Future development costs	(30,586)	(354,139)
Future income tax expenses	(4,815)	(360,702)
Future Net Cash Flows	67,117	798,876
10% annual discount for estimated timing of cash flows	(8,315)	(455,588)
Standardized Measure of Discounted Future Net Cash Flows	$ 58,802	$ 343,288	$ 238,228

X

- Definition

Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves.

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Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves.

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Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves.

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