Exit and Termination Costs - Additional Information (Detail) - USD ($)	3 Months Ended					12 Months Ended
	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
One-time minimum volume commitment contract payment		$ 28,500,000				$ 0	$ 28,500,000	$ 0
Severance costs						567,000	5,909,000	7,535,000
Restructuring Charges						21,661,000	547,409,000	9,506,000
Workforce Reduction
Restructuring Cost And Reserve [Line Items]
Severance costs		3,700,000			$ 2,200,000
North Louisiana
Restructuring Cost And Reserve [Line Items]
Accretion expense						47,900,000	20,200,000
Exit cost		479,800,000
Severance costs		$ 2,500,000				416,400,000
Restructuring Charges	$ 28,200,000
Pennsylvania
Restructuring Cost And Reserve [Line Items]
Exit cost			$ 10,400,000			754,000	$ 10,900,000	0
Pennsylvania | Capacity Releases on Transportation Pipelines
Restructuring Cost And Reserve [Line Items]
Exit cost						$ 7,300,000
Northwest Pennsylvania
Restructuring Cost And Reserve [Line Items]
Severance costs				$ 1,400,000
Northwest Pennsylvania | Non-Core Assets
Restructuring Cost And Reserve [Line Items]
Severance costs								$ 819,000