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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2017 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2016 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2015 MMcfe MMcf MBbls
Reserve Quantities [Line Items] |  |  |  |  |
Percentage of proved resources reviewed by consultants |  | 94.00% |  |  |
Proved Reserve And Pretax Present Value of Reserve Discounted |  | 10.00% |  |  |
Variance in reserve estimates |  | less than 5%. |  |  |
Scheduled to be drilling period maximum for undeveloped reserves |  | Scheduled to be drilled within five years |  |  |
Reserve attributable to natural gas |  | 72.00% | 82.00% | 86.00% |
Revision of positive pricing and performance |  | 957,000 |  |  |
Revisions of positive pricing |  | 154,000 | 46,000 |  |
Improved recoveries |  |  | 597,000 | 393,000 |
Proved undeveloped reserves dropped |  | 379,000 | 668,000 | 269,000 |
Cost spent on undeveloped reserves transferred to developed reserves | $ |  | $ 623.3 |  |  |
Estimated future development costs over next five years | $ |  | $ 3,300.0 |  |  |
Crude Oil and NGL |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / bbl |  | 65.55 | 51.19 | 42.68 |
Crude Oil and Condensate |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 59.96 | 45.73 | 37.41 |
Proved developed and undeveloped reserves | MBbls |  | 85,856 | 69,854 | 70,252 | 53,193
NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 25.22 | 17.84 | 13.44 |
Proved developed and undeveloped reserves | MBbls |  | 921,594 | 763,264 | 630,066 | 549,135
Natural Gas |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / Mcf |  | 2.98 | 2.60 | 2.07 |
Proved developed and undeveloped reserves | MMcf |  | 12,027,702 | 10,263,649 | 7,870,416 | 6,277,697
Natural Gas, Per Thousand Cubic Feet |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / MMBTU |  | 3.10 | 2.98 | 2.48 |
Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved reserves from drilling activities and evaluations of proved areas | [1] | 3,143,898 | 3,487,519 | 1,394,134 |
Proved developed and undeveloped reserve balances | [1] | 18,072,406 | 15,262,361 | 12,072,322 | 9,891,663
Revisions of previous estimates | [1] | 731,735 | 506,919 | 255,794 |
Revisions of positive performance |  |  | 532,000 | 154,000 |
Ethane and Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserve balances |  | 2,075,000 | 1,596,000 | 1,367,000 |
Ethane Reserves and NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves | MBbls |  | 468,900 | 360,600 | 308,900 |
Maximum |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Statement That Reserve Estimates Differ From Auditors |  | 0.10 |  |  |
[1] | Oil and NGLs are converted to mcfe at the rate of one barrel equals six mcf based upon the approximate relative energy content of oil to natural gas, which is not indicative of the relationship between oil and natural gas prices.

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