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Exit and Termination Costs - Summary of Exit and Termination Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost And Reserve [Line Items]          
Severance costs $ 0 $ 4,191   $ 509 $ 5,638
One-time minimum volume commitment contract payment 0 28,500   0 28,500
Stock-based compensation 0 2,020   0 2,020
Total termination costs 11,789 521,633   9,557 533,525
Pennsylvania          
Restructuring Cost And Reserve [Line Items]          
Exit cost 186 233 $ 10,400 580 10,678
North Louisiana Contract Release          
Restructuring Cost And Reserve [Line Items]          
Exit cost $ 11,603 $ 486,689   $ 8,468 $ 486,689