Summary of Significant Accounting Policies - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (722)	$ (21)
Total accounts receivable	44,076	62,120
Oil, gas and NGL sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	31,743	50,171
Due from joint interest owners (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	10,596	9,551
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	$ 2,459	$ 2,419