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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Extractive Industries [Abstract] |  |  |  |  |
Future cash inflows |  | $ 48,718,733 | $ 64,287,737 |  |
Future costs: |  |  |  |  |
Production |  | (23,320,477) | (25,626,373) |  |
Development | [1] | (3,219,349) | (3,824,936) |  |
Future net cash flows before income taxes |  | 22,178,907 | 34,836,428 |  |
Future income tax expense |  | (4,179,297) | (7,285,274) |  |
Total future net cash flows before 10% discount |  | 17,999,610 | 27,551,154 |  |
10% annual discount |  | (11,371,037) | (16,435,560) |  |
Standardized measure of discounted future net cash flows |  | $ 6,628,573 | $ 11,115,594 | $ 7,165,214 | $ 3,451,929
[1] | 2019 includes $339.1 million of undiscounted future asset retirement costs estimated as of December 31, 2019, using current estimates of future abandonment costs.

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- Definition Amount of estimated future accumulated cash inflow from the sale 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 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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