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Stock-based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 9,322 $ 9,759 $ 28,697 $ 31,940
Termination Costs        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense 2,020 (1) 2,020 25
Direct Operating Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense (74) 319 810 1,459
Brokered Natural Gas and Marketing Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense 324 522 905 1,523
Exploration Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense 189 496 891 1,372
General and Administrative Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 6,863 $ 8,423 $ 24,071 $ 27,561