Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Additional Textual [Abstract]
Remaining environmental accrued liability recorded	$ 0	$ 0	$ 0
Beta's decommissioning obligations, full supported by surety bonds	161,300,000	161,300,000
Beta's decommissioning obligations, cash	300,000	300,000
Oklahoma [Member]
Commitments and Contingencies Additional Textual [Abstract]
Commitment fee expense	500,000	800,000
East Texas [Member]
Commitments and Contingencies Additional Textual [Abstract]
Commitment fee expense	$ 500,000	$ 900,000