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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) bbl in Thousands, MMBTU in Thousands, $ in Thousands | Jun. 30, 2019 USD ($) MMBTU bbl | Dec. 31, 2018 USD ($) MMBTU bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 1,745 | 2,416
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 1,135 | 415
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 7,880 | $ 24,332
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (3,812) | $ (646)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 10,197 | 5,745
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 3,066 | 9,314
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,861 | $ 417
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (248) | $ (1,272)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 1,205 | 415
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 1,675 | 2,416
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 3,919 | $ 646
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (7,662) | $ (24,009)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 3,066 | 10,236
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 10,197 | 4,823
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 248 | $ 1,373
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,768) | $ (393)

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