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Related Party Transactions - Summary of Third-party Pass-through Costs for Which Revenues in Amount Equal to Costs are Recognized (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction [Line Items]
Reimbursement revenue	$ 264.7	$ 214.9	[1]	$ 825.1	$ 594.5	[1]
Hess
Related Party Transaction [Line Items]
Total	29.3	34.8		124.6	87.5
Hess | Rail Transportation Costs
Related Party Transaction [Line Items]
Reimbursement revenue	5.0	12.0		49.3	24.1
Hess | Produced Water Trucking and Disposal Costs
Related Party Transaction [Line Items]
Reimbursement revenue	14.0	14.5		45.6	40.2
Hess | Electricity Fees
Related Party Transaction [Line Items]
Reimbursement revenue	$ 10.3	$ 8.3		$ 29.7	$ 23.2
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.

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