Commitments and Contingencies - Additional Information (Detail) a in Thousands, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) a integer agreement
Commitments and Contingencies Disclosure [Abstract]
Number of firm transportation contracts | agreement		2
Number of firm pipeline transportation contracts		1
Minimum volume commitment		1
Number of reimbursement obligations		2
Number of other commitments		2
Number of Drilling Commitments		1
Number of Wells Due by July 2022		2
Number of Wells Due by July 2023		3
Acreage to be Assigned if Drilling Commitment Not Met | a		13
Drilling Commitment Due 2022 | $		$ 10.2
Drilling Commitment Due 2023 | $		15.3
Expense Due To Minimum Volume Commitment, Fresh Water | $	$ 0.5	$ 0.5