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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, 2015 USD ($) MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2014 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2013 MMcfe $ / MMBTU $ / bbl $ / Mcf MMcf MBbls | Dec. 31, 2012 MMcfe MMcf MBbls
Reserve Quantities [Line Items] |  |  |  |  |
Percentage of proved resources reviewed by consultant |  | 94.00% |  |  |
Statement That Reserve Estimates Differ From Auditors |  | more than 10% |  |  |
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 |  | 80.00% | 58.00% | 49.00% |
Improved recoveries |  | 781,000 | 449,600 | 630,300 |
Proved undeveloped reserves dropped |  | 1,200,000 | 611,000 |  |
Cost spent on undeveloped reserves transferred to developed reserves | $ |  | $ 398.8 |  |  |
Estimated future development costs in 2016 | $ |  | 435.6 |  |  |
Estimated future development costs in 2017 | $ |  | 509,400.0 |  |  |
Estimated future development costs in 2018 | $ |  | $ 471.6 |  |  |
Crude Oil and NGL |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / bbl |  | 50.13 | 94.42 | 97.33 |
Crude Oil |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 35.07 | 79.04 | 86.66 |
Proved developed and undeveloped reserves | MBbls |  | 53,193 | 48,658 | 48,360 | 45,082
NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / bbl |  | 11.74 | 27.20 | 25.93 |
Proved developed and undeveloped reserves | MBbls |  | 549,135 | 515,907 | 374,412 | 240,399
Natural Gas |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Estimate reserve information average realized prices | $ / Mcf |  | 2.07 | 4.14 | 3.75 |
Proved developed and undeveloped reserves | MMcf |  | 6,277,697 | 6,922,836 | 5,665,645 | 4,792,676
Natural Gas, Per Thousand Cubic Feet |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Benchmark price used for calculating average realized prices | $ / MMBTU |  | 2.59 | 4.35 | 3.67 |
Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved reserves from drilling activities and evaluations of proved areas | [1] | 1,265,348 | 2,398,709 | 1,732,944 |
Proved developed and undeveloped reserve balances | [1] | 9,891,663 | 10,310,229 | 8,202,274 | 6,505,570
Revisions of previous estimates | [1] | (211,163) | 90,822 | 448,898 |
Ethane and Natural Gas Equivalents |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserve balances |  | 1,296,000 | 1,170,000 | 676,000 |
Ethane Reserves and NGLs |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves | MBbls |  | 292,800 | 264,300 | 155,800 |
[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 of oil and natural gas prices.

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