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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 | Dec. 31, 2021 USD ($) MMBTU bbl | Dec. 31, 2020 USD ($) bbl MMBTU
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | bbl | 4,809 | 3,056
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 14,721 | $ 8,341
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 7,032 | 6,391
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (73,594) | $ (32,112)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 15,947 | 9,281
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 4,143 | $ 1,529
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 29,446 | 15,079
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (21,249) | $ (3,265)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | bbl | 7,046 | 6,391
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 74,437 | $ 32,670
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 4,796 | 3,056
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (14,294) | $ (8,264)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 29,446 | 17,636
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 21,456 | $ 3,451
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 15,947 | 6,724
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (4,124) | $ (1,458)

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