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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Future Cash Flows:    
Future cash inflows $ 364,352 $ 920,454
Production costs (164,649) (312,666)
Development and abandonment costs (7,826) (20,072)
Future net cash flows before 10% discount 191,877 587,716
Discount to present value at a 10% annual rate (75,524) (282,519)
Total standardized measure of discounted net cash flows $ 116,353 $ 305,197