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Summary of Significant Accounting Policies - Schedule of Gas Derivative Contracts Volume and Prices (Detail)	Sep. 30, 2018 MMBTU bbl $ / bbl $ / MMBTU
Natural Gas Contracts, in MMBTU | Swap Contracts for Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Average price per MMBtu in usd	3.00
Natural Gas Contracts, in MMBTU | Swap Contracts for 2019
Derivative [Line Items]
Volume, MMBTU | MMBTU	4,200,000
Average price per MMBtu in usd	3.00
Natural Gas Contracts, in MMBTU | Swap Contracts
Derivative [Line Items]
Volume, MMBTU | MMBTU	9,600,000
Average price per MMBtu in usd	3.00
Natural Gas Contracts, in MMBTU | Collar Contracts for Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	6,300,000
Ceiling, Average price per MMBTU	3.40
Floor, Average price per MMBTU	2.50
Natural Gas Contracts, in MMBTU | Swap Contracts for 2019
Derivative [Line Items]
Volume, MMBTU | MMBTU	13,200,000
Ceiling, Average price per MMBTU	3.40
Floor, Average price per MMBTU	2.50
Natural Gas Contracts, in MMBTU | Collar Contracts
Derivative [Line Items]
Volume, MMBTU | MMBTU	19,500,000
Ceiling, Average price per MMBTU	3.40
Floor, Average price per MMBTU	2.50
Crude Oil Contracts, in Barrels | Collar Contracts for Q4
Derivative [Line Items]
Volume, MMBTU | bbl	315,000
Ceiling, Average price per MMBTU | $ / bbl	77.85
Floor, Average price per MMBTU | $ / bbl	55.00
Crude Oil Contracts, in Barrels | Swap Contracts for 2019
Derivative [Line Items]
Volume, MMBTU | bbl	855,000
Ceiling, Average price per MMBTU | $ / bbl	77.98
Floor, Average price per MMBTU | $ / bbl	55.00
Crude Oil Contracts, in Barrels | Collar Contracts
Derivative [Line Items]
Volume, MMBTU | bbl	1,170,000
Ceiling, Average price per MMBTU | $ / bbl	77.94
Floor, Average price per MMBTU | $ / bbl	55.00

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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

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+ Details

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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

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

+ References

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- Definition

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+ References

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