Proved developed reserve net energy period increase.

No definition available.

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- Definition

Proved undeveloped reserve converted percentage.

+ References

No definition available.

+ Details

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- Definition

Proved undeveloped reserve decrease BOE.

+ References

No definition available.

+ Details

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- Definition

Proved undeveloped reserve net energy period increase.

+ References

No definition available.

+ Details

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- Definition

Unweighted arithmetic average first month prices for natural gas.

+ References

No definition available.

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- Definition

Unweighted arithmetic average first month prices for oil.

+ References

No definition available.

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- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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- Definition

Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

+ References

No definition available.

+ Details

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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- Definition

Energy measure of increase (decrease) of quantity 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).

+ References

No definition available.

+ Details

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

+ Details

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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Period Type:	duration

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Energy measure of proved undeveloped 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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) MBoe MMBoe $ / bbl $ / MMBTU	Dec. 31, 2015 USD ($) MBoe $ / bbl $ / MMBTU	Dec. 31, 2014 USD ($) MBoe $ / bbl $ / MMBTU	Dec. 31, 2013 MBoe
Reserve Quantities [Line Items]
Additions to oil and gas properties \| $	$ 103,298,000	$ 72,158,000	$ 186,180,000
Capitalized exploratory well costs \| $	$ 0	$ 0	$ 0
Proved developed and undeveloped reserves increase (decrease)	(0.5)		10,800
Purchases of minerals in place	10,647	1,962	8,473
Production of minerals in place	1,465	1,437	882
Proved developed and undeveloped downward reserve revision	(10,128)	(9,484)	806
Extensions and discoveries	423	685	2,364
Proved undeveloped reserves	2,690	3,961	12,392	7,725
Estimated proved undeveloped reserves decrease	1,300
Proved developed reserves increase			6,100
Proved undeveloped reserves increase			4,700
Lynden Arrangement [Member]
Reserve Quantities [Line Items]
Purchases of minerals in place	10,647
Oak Valley Resources L L C Exchange Agreement [Member]
Reserve Quantities [Line Items]
Extensions and discoveries			2,364
Eagle Ford Property [Member]
Reserve Quantities [Line Items]
Purchases of minerals in place			8,473
Proved undeveloped reserve converted percentage	62.00%
Henry Hub Spot Price [Member]
Reserve Quantities [Line Items]
Unweighted average of first of the month prices of natural gas \| $ / MMBTU	2.48	2.59	4.30
West Texas Intermediate Spot Price [Member]
Reserve Quantities [Line Items]
Unweighted average of first of the month prices of oil \| $ / bbl	42.75	50.28	94.99
New Wells [Member]
Reserve Quantities [Line Items]
Additions to oil and gas properties \| $	$ 200,000	$ 200,000	$ 200,000