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Summary of Significant Accounting Policies - Schedule of Gas Derivative Contracts Volume and Prices (Detail)	Jun. 30, 2018 MMBTU $ / MMBTU
Gas Contracts, in MMBTU | Swap Contracts for Q3
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Swap Contracts for Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Swap Contracts for Q3 and Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	10,800,000
Gas Contracts, in MMBTU | Swap Contracts for 2019
Derivative [Line Items]
Volume, MMBTU | MMBTU	4,200,000
Gas Contracts, in MMBTU | Swap Contracts
Derivative [Line Items]
Volume, MMBTU | MMBTU	15,000,000
Gas Contracts, in MMBTU | Collar Contract One for Q3
Derivative [Line Items]
Volume, MMBTU | MMBTU	2,700,000
Gas Contracts, in MMBTU | Collar Contract One for Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	2,700,000
Gas Contracts, in MMBTU | Collar Contract One for Q3 and Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Collar Contract One for 2019
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Collar Contract One
Derivative [Line Items]
Volume, MMBTU | MMBTU	10,800,000
Gas Contracts, in MMBTU | Collar Contract Two for Q3
Derivative [Line Items]
Volume, MMBTU | MMBTU	2,700,000
Gas Contracts, in MMBTU | Collar Contract Two for Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	2,700,000
Gas Contracts, in MMBTU | Collar Contract Two for Q3 and Q4
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Collar Contract Two for 2019
Derivative [Line Items]
Volume, MMBTU | MMBTU	5,400,000
Gas Contracts, in MMBTU | Collar Contract Two
Derivative [Line Items]
Volume, MMBTU | MMBTU	10,800,000
Gas Contracts, Price per MMBTU | Swap Contracts for Q3
Derivative [Line Items]
Price per MMBtu in usd	3.00
Gas Contracts, Price per MMBTU | Swap Contracts for Q4
Derivative [Line Items]
Price per MMBtu in usd	3.00
Gas Contracts, Price per MMBTU | Swap Contracts for Q3 and Q4
Derivative [Line Items]
Price per MMBtu in usd	3.00
Gas Contracts, Price per MMBTU | Swap Contracts for 2019
Derivative [Line Items]
Price per MMBtu in usd	3.00
Gas Contracts, Price per MMBTU | Swap Contracts
Derivative [Line Items]
Price per MMBtu in usd	3.00
Gas Contracts, Price per MMBTU | Collar Contract One for Q3
Derivative [Line Items]
Ceiling, price per MMBTU	3.30
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract One for Q4
Derivative [Line Items]
Ceiling, price per MMBTU	3.30
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract One for Q3 and Q4
Derivative [Line Items]
Ceiling, price per MMBTU	3.30
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract One for 2019
Derivative [Line Items]
Ceiling, price per MMBTU	3.30
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract One
Derivative [Line Items]
Ceiling, price per MMBTU	3.30
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract Two for Q3
Derivative [Line Items]
Ceiling, price per MMBTU	3.50
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract Two for Q4
Derivative [Line Items]
Ceiling, price per MMBTU	3.50
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract Two for Q3 and Q4
Derivative [Line Items]
Ceiling, price per MMBTU	3.50
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract Two for 2019
Derivative [Line Items]
Ceiling, price per MMBTU	3.50
Floor, price per MMBTU	2.50
Gas Contracts, Price per MMBTU | Collar Contract Two
Derivative [Line Items]
Ceiling, price per MMBTU	3.50
Floor, price per MMBTU	2.50

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

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+ References

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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

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+ References

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+ References

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