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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Future cash inflows	$ 384,198	$ 221,542
Future production costs	(175,099)	(115,091)
Future development costs	(34,798)	(31,870)
Future income tax expenses	(20,884)	(7,883)
Future Net Cash Flows	153,417	66,698
10% annual discount for estimated timing of cash flows	(46,503)	(14,461)
Standardized Measure of Discounted Future Net Cash Flows	$ 106,914	$ 52,237	$ 58,802

X

- Definition

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

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-Publisher FASB
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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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Amount, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale of proved oil and gas reserves.

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