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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Proved Developed and Undeveloped Reserves (Detail)		12 Months Ended
		Dec. 31, 2016 MMcfe MMcf MBbls	Dec. 31, 2015 MMcfe MMcf MBbls	Dec. 31, 2014 MMcfe MMcf MBbls
Proved undeveloped reserves:
Proved undeveloped reserves | MMcfe		5,302,414	4,469,588
Natural Gas
Reserve Quantities [Line Items]
Beginning Balance | MMcf		6,277,697	6,922,836	5,665,645
Revisions | MMcf		(7,441)	(340,286)	(30,566)
Extensions, discoveries and additions | MMcf		1,193,154	1,017,956	1,393,108
Purchases | MMcf		943,544	0	262,813
Property sales | MMcf		(160,727)	(960,122)	(81,238)
Production | MMcf		(375,811)	(362,687)	(286,926)
Ending Balance | MMcf		7,870,416	6,277,697	6,922,836
Proved developed reserves:
Proved developed reserves | MMcf		4,352,141	3,376,165	3,583,051
Proved undeveloped reserves:
Proved undeveloped reserves | MMcf		3,518,275	2,901,533	3,339,785
NGLs
Reserve Quantities [Line Items]
Beginning Balance		549,135	515,907	374,412
Revisions		41,402	17,717	19,716
Extensions, discoveries and additions		26,991	36,308	154,664
Purchases		40,724	0	0
Property sales		(360)	(441)	(14,064)
Production		(27,826)	(20,356)	(18,821)
Ending Balance		630,066	549,135	515,907
Proved developed reserves:
Proved developed reserves		363,852	309,306	270,271
Proved undeveloped reserves:
Proved undeveloped reserves		266,214	239,828	245,636
Crude Oil and Condensate
Reserve Quantities [Line Items]
Beginning Balance		53,193	48,658	48,360
Revisions		2,471	3,804	515
Extensions, discoveries and additions		6,506	4,924	12,936
Purchases		11,986	0	0
Property sales		(295)	(109)	(9,083)
Production		(3,609)	(4,084)	(4,070)
Ending Balance		70,252	53,193	48,658
Proved developed reserves:
Proved developed reserves		39,110	31,679	24,180
Proved undeveloped reserves:
Proved undeveloped reserves		31,143	21,514	24,478
Natural Gas Equivalents
Proved developed reserves:
Proved developed reserves | MMcfe	[1]	6,769,908	5,422,075	5,349,761
Proved undeveloped reserves:
Proved undeveloped reserves | MMcfe	[1]	5,302,414	4,469,588	4,960,468
Beginning Balance | MMcfe	[1]	9,891,663	10,310,229	8,202,274
Revisions | MMcfe	[1]	255,794	(211,163)	90,822
Extensions, discoveries and additions | MMcfe	[1]	1,394,134	1,265,348	2,398,709
Purchases | MMcfe	[1]	1,259,806	0	262,813
Property sales | MMcfe	[1]	(164,655)	(963,423)	(220,122)
Production | MMcfe	[1]	(564,420)	(509,328)	(424,267)
Ending Balance | MMcfe	[1]	12,072,322	9,891,663	10,310,229
[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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Proved developed reserve.

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Proved undeveloped reserves.

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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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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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Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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