Stock-based Compensation Plans - Additional Information 1 (Detail) shares in Thousands	9 Months Ended
Sep. 30, 2022 Award shares
Restricted Stock Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Equity Awards \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	30.00%
Restricted Stock Equity Awards \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	40.00%
Performance Share
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards available for grant	3
Method of measuring cost of award	In first quarter 2021, our internal performance metrics were changed to focus on debt reduction and to include an environmental component. For shares granted in 2021, the performance conditions will be measured against internal metrics of Debt/EBITDAX (earnings before interest, taxes, depreciation, amortization and exploration expense) and emission intensity performance. For shares granted in first quarter 2022, the performance conditions will be measured against internal metrics of total net debt (total debt less cash on hand) and emission intensity performance.
Performance Share \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share value each unit represents at grant date \| shares	1
Performance Based TSR - PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Number of awards available for grant	1
Performance Based TSR - PSUs \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout of shares granted	0.00%
Performance Based TSR - PSUs \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout of shares granted	200.00%
Performance-based PS-PSUs and RS-PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Number of awards available for grant	2

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