Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) bbl in Thousands, MMBTU in Thousands, $ in Thousands	Mar. 31, 2020 USD ($) MMBTU bbl	Dec. 31, 2019 USD ($) MMBTU bbl
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | bbl	2,639	1,214
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl	576	2,148
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 61,479	$ 2,796
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (634)	$ (6,916)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU	5,807	8,295
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU	4,313	2,689
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 2,455	$ 2,131
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (346)	$ (70)
Customer Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | bbl	576	2,172
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl	2,639	1,190
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 645	$ 7,208
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (61,087)	$ (2,652)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU	4,313	2,689
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU	5,807	8,295
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 397	$ 83
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (2,392)	$ (2,039)