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Supplementary Oil and Gas Information - Additional Information (Detail) a in Thousands	Jun. 30, 2018 a Wells
Gas and oil acreage [Line Items]
Operated wells that had multiple completions, gross | Wells	20
Operated wells that had multiple completions, net | Wells	9
Expiring June 2019 [member]
Gas and oil acreage [Line Items]
Approximately acres of undeveloped acreage that will expire, gross	4,245
Approximately acres of undeveloped acreage that will expire, net	2,850
Expiring June 2020 [member]
Gas and oil acreage [Line Items]
Approximately acres of undeveloped acreage that will expire, gross	526
Approximately acres of undeveloped acreage that will expire, net	278
Expiring June 2021 [member]
Gas and oil acreage [Line Items]
Approximately acres of undeveloped acreage that will expire, gross	1,490
Approximately acres of undeveloped acreage that will expire, net	1,078

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- Definition

Gas and oil, undeveloped acreage set to expire, gross.

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- Definition

Gas and oil, undeveloped acreage set to expire, net.

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- Definition

The total number of productive wells and wells capable of production which access multiple reservoirs through one well bore, in which the entity owns an undivided working interest.

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- Definition

The total number of productive wells and wells capable of production which access multiple reservoirs through one well bore, in which the entity owns a fractional working interest.

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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.

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