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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, 2020 | Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Sales of oil and gas produced, net of production costs | $ (13,945) | $ (15,938)
Net changes in prices and production costs | (16,578) | (42,409)
Extensions, discoveries and improved recovery | 314 | 31,276
Revisions of previous quantity estimates | (36,919) | (3,319)
Net change in development costs | 20,724 | (53,143)
Reserves sold | (874) | (113)
Reserves purchased | 218 | 174
Accretion of discount | 8,161 | 13,791
Net change in income taxes | 5,386 | 5,572
Changes in production rates (timing) and other | (6,480) | 7,812
Net change | (39,993) | (56,297)
Standardized measure of discounted future net cash flow: |  |
Beginning of year | 81,612 | 137,909
End of year | $ 41,619 | $ 81,612

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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