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Related Party Transactions - Summary of Revenues From Contracts With Customers on Disaggregated Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 269.8 $ 190.2 [1] $ 560.4 $ 379.6 [1]
Other income   0.1 [1] 0.2 0.3 [1]
Total revenues 269.8 190.3 [1] 560.6 379.9 [1]
Oil and Gas Gathering Services        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 113.1 80.2 230.5 159.2
Water Gathering and Disposal Services        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 23.3 17.5 47.5 32.9
Processing and Storage Services        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 86.8 67.5 183.6 133.8
Terminaling and Export Services        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 46.6 $ 25.0 $ 98.8 $ 53.7
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.