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Exit and Termination Costs - Summary of Exit and Termination Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]        
Severance costs   $ 5,909 $ 7,535 $ (356)
One-time minimum volume commitment contract payment $ 28,500 28,500 0 0
Stock-based compensation and other   2,165 1,971 (17)
Total termination costs   547,409 9,506 (373)
Pennsylvania        
Restructuring Cost And Reserve [Line Items]        
Exit cost   10,900 0 0
North Louisiana Contract Release        
Restructuring Cost And Reserve [Line Items]        
Exit cost   $ 499,935 $ 0 $ 0