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Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Earnings from equity investments	$ 900,000		$ 3,600,000
Distributions from equity investments			$ 3,800,000
LM4
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	50.00%		50.00%
Expenses incurred under gas processing agreement	$ 5,000,000.0	$ 0	$ 11,400,000	$ 0
Earnings from equity investments	$ 900,000	$ 0	3,600,000	$ 0
Distributions from equity investments			$ 3,800,000
Credit Concentration Risk | Revenue
Related Party Transaction [Line Items]
Revenues attributable to fee based commercial agreements	100.00%	100.00%	100.00%	100.00%
Hess
Related Party Transaction [Line Items]
Minimum volume shortfall fee payments	$ 3,100,000	$ 700,000	$ 4,100,000	$ 3,500,000
Expenses incurred under gas processing agreement	$ 15,300,000	$ 12,300,000	$ 30,800,000	$ 22,900,000
Hess | Credit Concentration Risk | Revenue
Related Party Transaction [Line Items]
Revenues attributable to fee based commercial agreements	100.00%	100.00%	100.00%	100.00%
Targa Resources Corp. | LM4
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	50.00%		50.00%

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