Average price per MMBtu or barrel [Abstract]

No definition available.

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- Definition

Nominal flow rate used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

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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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No definition available.

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- Definition

Nominal flow rate used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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- Details

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Derivative Instruments - Oil and Natural-Gas Production/Processing Derivative Activities Table (Detail) - Not Designated as Hedging Instrument [Member] MMBTU / d in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018 MMBTU / d $ / MMBTU	Dec. 31, 2017 MMBTU / d MBbls / d $ / bbl $ / MMBTU
Two Way Collars Oil 2018 [Member]
Derivative [Line Items]
Oil derivative nonmonetary notional amount per day \| MBbls / d		108
Two Way Collars Oil 2018 [Member] \| Call Option [Member] \| Short [Member]
Average price per barrel or MMBtu
Ceiling sold price \| $ / bbl		60.48
Two Way Collars Oil 2018 [Member] \| Put Option [Member] \| Long [Member]
Average price per barrel or MMBtu
Floor purchased price \| $ / bbl		50.00
Forward Contracts Oil 2018 [Member]
Derivative [Line Items]
Oil derivative nonmonetary notional amount per day \| MBbls / d		84
Average price per barrel or MMBtu
Average price		61.45
Three Way Collars Natural Gas 2018 [Member]
Derivative [Line Items]
Natural-gas derivative nonmonetary notional amount per day \| MMBTU / d		250
Three Way Collars Natural Gas 2018 [Member] \| Call Option [Member] \| Short [Member]
Average price per barrel or MMBtu
Ceiling sold price		3.54
Three Way Collars Natural Gas 2018 [Member] \| Put Option [Member] \| Short [Member]
Average price per barrel or MMBtu
Floor purchased price		2.00
Three Way Collars Natural Gas 2018 [Member] \| Put Option [Member] \| Long [Member]
Average price per barrel or MMBtu
Floor purchased price		2.75
Subsequent Event [Member] \| Forward Contracts Natural Gas 2018 [Member]
Derivative [Line Items]
Natural-gas derivative nonmonetary notional amount per day \| MMBTU / d	280,000
Average price per barrel or MMBtu
Average price	3.02