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Supplementary Information - Standardized Measure of Discounted Future Net Cash Flows and Changes therein Relating to Proved Oil and Gas Reserves (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Sales of oil and gas produced, net of production costs | $ (10,426) | $ (47,074)
Net changes in prices and production costs | (511,116) | (18,510)
Extensions, discoveries and improved recovery | 24,967 | 198,235
Revisions of previous quantity estimates | (180,048) | 67,245
Net change in development costs | 235,285 | (69,923)
Reserves sold | (1,160) | (69)
Reserves purchased | 737 |
Accretion of discount | 34,329 | 23,823
Net change in income taxes | 146,339 | (56,744)
Changes in production rates (timing) and other | (23,393) | 8,077
Net change | (284,486) | 105,060
Standardized measure of discounted future net cash flow: |  |
Beginning of year | 343,288 | 238,228
End of year | $ 58,802 | $ 343,288

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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