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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Reimbursement revenue	$ 294.8	$ 269.8	$ 583.6	$ 560.4
Hess
Related Party Transaction [Line Items]
Total	18.6	46.0	37.4	95.3
Hess | Electricity Fees
Related Party Transaction [Line Items]
Reimbursement revenue	9.9	9.9	19.2	19.4
Hess | Produced Water Trucking and Disposal Costs
Related Party Transaction [Line Items]
Reimbursement revenue	$ 8.7	15.0	18.1	31.6
Hess | Rail Transportation Costs
Related Party Transaction [Line Items]
Reimbursement revenue		$ 21.1	$ 0.1	$ 44.3