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Summary of Significant Accounting Policies - Schedule of Gas Derivative Contracts Volume and Prices (Detail) | Jun. 30, 2018 MMBTU $ / MMBTU
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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 + Details
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X
- 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. + 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 No definition available. + Details
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