Exit and Termination Costs - Summary of Exit and Termination Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 4,191	$ 819	$ 5,638	$ 3,000
One-time minimum volume commitment contract payment	28,500	0	28,500	0
Stock-based compensation	2,020	0	2,020	25
Total termination costs	521,633	819	533,525	3,025
Pennsylvania
Restructuring Cost And Reserve [Line Items]
Exit cost	233	0	10,678	0
North Louisiana Contract Release
Restructuring Cost And Reserve [Line Items]
Exit cost	$ 486,689	$ 0	$ 486,689	$ 0