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Stock-based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | $ 44,284 | $ 38,843 | $ 42,382
Direct Operating Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 1,310 | 1,078 | 1,928
Brokered Natural Gas and Marketing Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 1,794 | 1,416 | 1,856
Exploration Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 1,507 | 1,279 | 1,566
General and Administrative Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 39,673 | 32,905 | 35,061
Termination Costs |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | $ 0 | $ 2,165 | $ 1,971

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