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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, 2016 USD ($) MMcfe $ / Mcf $ / bbl $ / MMBTU MMcf MBbls	Dec. 31, 2015 MMcfe $ / Mcf $ / bbl $ / MMBTU MMcf MBbls	Dec. 31, 2014 MMcfe $ / Mcf $ / bbl $ / MMBTU MMcf MBbls	Dec. 31, 2013 MMcfe MMcf MBbls
Reserve Quantities [Line Items]
Percentage of proved resources reviewed by consultants		96.00%
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		86.00%	80.00%	58.00%
Improved recoveries		393,000	781,000	449,600
Proved undeveloped reserves dropped		269,000	1,200,000	611,000
Cost spent on undeveloped reserves transferred to developed reserves | $		$ 245.6
Estimated future development costs in 2017 | $		877.9
Estimated future development costs in 2018 | $		516.6
Estimated future development costs in 2019 | $		$ 607.7
Proved undeveloped reserves reported for more than five years		50,000
Maximum
Reserve Quantities [Line Items]
Percentage of proved undeveloped reserves reported for more than five years		1.00%
Crude Oil and NGL
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices | $ / bbl		42.68	50.13	94.42
Crude Oil
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / bbl		37.41	35.07	79.04
Proved developed and undeveloped reserves | MBbls		70,252	53,193	48,658	48,360
NGLs
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / bbl		13.44	11.74	27.20
Proved developed and undeveloped reserves | MBbls		630,066	549,135	515,907	374,412
Natural Gas
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / Mcf		2.07	2.07	4.14
Proved developed and undeveloped reserves | MMcf		7,870,416	6,277,697	6,922,836	5,665,645
Natural Gas, Per Thousand Cubic Feet
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices | $ / MMBTU		2.48	2.59	4.35
Natural Gas Equivalents
Reserve Quantities [Line Items]
Proved reserves from drilling activities and evaluations of proved areas	[1]	1,394,134	1,265,348	2,398,709
Proved developed and undeveloped reserve balances	[1]	12,072,322	9,891,663	10,310,229	8,202,274
Revisions of previous estimates	[1]	255,794	(211,163)	90,822
Revisions of positive performance		154,000
Ethane and Natural Gas Equivalents
Reserve Quantities [Line Items]
Proved developed and undeveloped reserve balances		1,367,000	1,296,000	1,170,000
Ethane Reserves and NGLs
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves | MBbls		308,900	292,800	264,300
[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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