Supplemental Crude Oil and Natural Gas Information - Schedule of Proved Crude Oil and Natural Gas Reserves (Detail)	12 Months Ended
Dec. 31, 2017 $ / Barrels MBoe MMcf MBbls	Dec. 31, 2016 $ / Barrels MBoe MMcf MBbls	Dec. 31, 2015 MBoe MMcf MBbls	Dec. 31, 2014 MBoe
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Reserve, Net (Energy) \| MBoe	1,330,995	1,274,864	1,225,811	1,351,091
Changes in Proved Reserves [Roll Forward]
Revisions of previous estimates \| MBoe	(82,012)	(110,474)	(297,198)
Extensions, discoveries, and other additions \| MBoe	240,206	249,430	253,173
Proved Developed and Undeveloped Reserve, Production (Energy) \| MBoe	88,562	79,390	80,926
Sales of minerals in place, Total \| MBoe	(15,197)	(10,513)	(329)
Purchases of minerals in place, Total \| MBoe	1,696	0	0
Percent of proved crude oil reserve estimates prepared by external reserve engineers	96.00%	99.00%	98.00%
Natural Gas [Member]
Reserve Quantities [Line Items]
Twelve month average SEC price \| $ / Barrels	2.98	2.49
Changes in Proved Reserves [Roll Forward]
Proved reserves at beginning of period \| MMcf	3,789,818	3,151,786	2,908,386
Revisions of previous estimates \| MMcf	(25,390)	(63,057)	(302,143)
Extensions, discoveries and other additions \| MMcf	661,867	911,062	710,453
Production \| MMcf	(228,159)	(195,240)	(164,454)
Sales of minerals in place \| MMcf	(64,989)	(14,733)	(456)
Purchases of minerals in place \| MMcf	7,134	0	0
Proved reserves at end of period \| MMcf	4,140,281	3,789,818	3,151,786
Crude Oil [Member]
Reserve Quantities [Line Items]
Twelve month average SEC price \| $ / Barrels	51.34	42.75
Changes in Proved Reserves [Roll Forward]
Proved reserves at beginning of period \| MBbls	643,228	700,514	866,360
Revisions of previous estimates \| MBbls	(77,779)	(99,966)	(246,840)
Extensions, discoveries and other additions \| MBbls	129,895	97,587	134,764
Production \| MBbls	(50,536)	(46,850)	(53,517)
Sales of minerals in place \| MBbls	(4,365)	(8,057)	(253)
Purchases of minerals in place \| MBbls	506	0	0
Proved reserves at end of period \| MBbls	640,949	643,228	700,514

Changes in Proved Reserves [Roll Forward]

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Percent Of Total Proved Reserve Estimates Prepared By External Reserve Engineers

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Twelve month average SEC price

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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Production of proved reserves.

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Purchase of minerals in place.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Sales of minerals in place.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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