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Exit and Termination Costs - Additional Information (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
One-time minimum volume commitment contract payment	$ 28,500,000				$ 28,500,000	$ 0	$ 0
Severance costs					5,909,000	7,535,000	(356,000)
Workforce Reduction
Restructuring Cost And Reserve [Line Items]
Severance costs	3,700,000			$ 2,200,000
North Louisiana
Restructuring Cost And Reserve [Line Items]
Exit cost	479,800,000
Severance costs	$ 2,500,000
Pennsylvania
Restructuring Cost And Reserve [Line Items]
Exit cost					$ 10,900,000	0	$ 0
Pennsylvania | Capacity Releases on Transportation Pipelines
Restructuring Cost And Reserve [Line Items]
Exit cost		$ 10,400,000
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

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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