Derivative Instruments - Summary of Derivative Instrument Positions for Future Production Periods (Detail)	6 Months Ended
	Jun. 30, 2020 MMBTU $ / MMBTU $ / bbl bbl
Natural Gas Swaps Production Period July 2020 – September 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	60,000
Weighted Average Price | $ / MMBTU	2.32
Natural Gas Swaps Production Period July 2020 – December 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	80,000
Weighted Average Price | $ / MMBTU	2.64
Natural Gas Swaps Production Period July 2020 – March 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	95,000
Weighted Average Price | $ / MMBTU	2.54
Natural Gas Swaps Production Period August 2020 – December 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.06
Natural Gas Swaps Production Period October 2020 – March 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.65
Natural Gas Swaps Production Period January 2021 – March 2022 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.51
Natural Gas Swaps Production Period April 2021 – March 2022 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	25,000
Weighted Average Price | $ / MMBTU	2.47
Basis Swaps Production Period July 2020 – October 2020 [Member] | Appalachia [Member] | Dominion Resources, Inc [Member] | Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	12,500
Weighted Average Price ($/MMBtu) | $ / MMBTU	(0.52)
Basis Swaps Production Period July 2020 – December 2020 [Member] | Appalachia [Member] | Dominion Resources, Inc [Member] | Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	20,000
Weighted Average Price ($/MMBtu) | $ / MMBTU	(0.59)
Natural Gas Collars Production Period January 2021 – December 2021 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	25,000
Weighted Average Price, Floor | $ / MMBTU	2.15
Natural Gas Collars Production Period January 2021 – December 2021 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	25,000
Weighted Average Price, Ceiling | $ / MMBTU	3.03
Natural Gas Three-way Collars Production Period January 2021 – December 2021 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	45,000
Weighted Average Price, Floor | $ / MMBTU	2.25
Natural Gas Three-way Collars Production Period January 2021 – December 2021 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	45,000
Weighted Average Price, Floor | $ / MMBTU	2.55
Natural Gas Three-way Collars Production Period January 2021 – December 2021 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	45,000
Weighted Average Price, Ceiling | $ / MMBTU	2.81
Natural Gas Three-way Collars Production Period April 2021 – March 2022 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	20,000
Weighted Average Price, Floor | $ / MMBTU	2.20
Natural Gas Three-way Collars Production Period April 2021 – March 2022 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	20,000
Weighted Average Price, Floor | $ / MMBTU	2.62
Natural Gas Three-way Collars Production Period April 2021 – March 2022 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	20,000
Weighted Average Price, Ceiling | $ / MMBTU	3.10
Natural Gas Three-way Collars Production Period July 2020 – December 2020 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	80,000
Weighted Average Price, Floor | $ / MMBTU	1.90
Natural Gas Three-way Collars Production Period July 2020 – December 2020 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	80,000
Weighted Average Price, Floor | $ / MMBTU	2.60
Natural Gas Three-way Collars Production Period July 2020 – December 2020 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	80,000
Weighted Average Price, Ceiling | $ / MMBTU	2.94
Natural Gas Call/Put Options Production Period January 2022 – December 2022 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	3.00
Natural Gas Call/Put Options Production Period January 2021 – March 2022 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.00
Natural Gas Call/Put Options Production Period January 2023 – December 2023 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	80,000
Weighted Average Price | $ / MMBTU	3.00
Natural Gas Call/Put Options Production Period July 2020 – September 2020 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	15,000
Weighted Average Price | $ / MMBTU	1.60
Natural Gas Call/Put Options Production Period July 2020 – December 2020 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.30
Natural Gas Call/Put Options Production Period January 2021 – December 2021 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	2.75
Natural Gas Call/Put Options Production Period January 2022 – December 2022 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (MMBtu/d) | MMBTU	50,000
Weighted Average Price | $ / MMBTU	3.00
Oil Swaps Production Period July 2020 – December 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	57.41
Volume (Bbls/d) | bbl	2,500
Oil Swaps Production Period July 2020 – March 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	53.20
Volume (Bbls/d) | bbl	250
Oil Swaps Production Period January 2021 – March 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	53.00
Volume (Bbls/d) | bbl	250
Oil Collars Production Period July 2020 – December 2020 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price, Floor | $ / bbl	51.00
Volume (Bbls/d) | bbl	1,000
Oil Collars Production Period July 2020 – December 2020 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price, Ceiling | $ / bbl	62.00
Volume (Bbls/d) | bbl	1,000
Oil Three-way Collars Production Period January 2021 – December 2021 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price, Floor | $ / bbl	22.50
Volume (Bbls/d) | bbl	500
Oil Three-way Collars Production Period January 2021 – December 2021 [Member] | Put Option [Member] | Purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price, Floor | $ / bbl	31.25
Volume (Bbls/d) | bbl	500
Oil Three-way Collars Production Period January 2021 – December 2021 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price, Ceiling | $ / bbl	45.00
Volume (Bbls/d) | bbl	500
Oil Call/Put Option Production Period July 2020 - December 2020 [Member] | Put Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	45.00
Volume (Bbls/d) | bbl	500
Oil Call/Put Option Production Period January 2021 - December 2021 [Member] | Call Option [Member] | Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	42.50
Volume (Bbls/d) | bbl	500
Propane Swaps Production Period July 2020 – December 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	20.68
Volume (Bbls/d) | bbl	1,500
Propane Swaps Production Period January 2021 – December 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price | $ / bbl	18.01
Volume (Bbls/d) | bbl	500