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Stock-based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 12,893 | $ 10,568
Direct Operating Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 349 | 327
Brokered Natural Gas and Marketing Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 519 | 450
Exploration Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 452 | 386
General and Administrative Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 11,573 | $ 9,405

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