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Earnings per Share/Limited Partner Unit - Partnership's Calculation of Earnings per Share Limited Partner Unit (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Limited Partners Capital Account [Line Items]    
Net income $ 129.0 $ 80.8 [1]
Less: Net income (loss) attributable to net parent investment [1]   (14.5)
Less: Net income (loss) attributable to noncontrolling interest 122.5 77.2 [1]
Net income attributable to Hess Midstream LP 6.5 18.1 [1]
Less: General partner's interest in net income [1]   0.8
Limited partners' interest in net income $ 6.5 17.3 [1]
Common Units    
Limited Partners Capital Account [Line Items]    
Common unitholders' interest in net income attributable to Hess Midstream LP   $ 8.7
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Basic and diluted [1]   $ 0.32
Weighted average limited partner units outstanding prior to the Restructuring, Basic:    
Units outstanding prior to the Restructuring, Basic [1]   27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:    
Units outstanding prior to the Restructuring, Diluted [1]   27.4
Subordinated Units    
Limited Partners Capital Account [Line Items]    
Common unitholders' interest in net income attributable to Hess Midstream LP   $ 8.6
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Basic and diluted [1]   $ 0.32
Weighted average limited partner units outstanding prior to the Restructuring, Basic:    
Units outstanding prior to the Restructuring, Basic [1]   27.3
Weighted average limited partner units outstanding prior to the Restructuring, Diluted:    
Units outstanding prior to the Restructuring, Diluted [1]   27.3
Class A Shares    
Net income attributable to Hess Midstream LP per Class A share:    
Net income attributable to Hess Midstream LP per Class A share, Basic $ 0.37  
Net income attributable to Hess Midstream LP per Class A share, Diluted $ 0.35  
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Weighted average Class A shares outstanding subsequent to the restructuring, Basic 18.0  
Weighted average Class A shares outstanding subsequent to the restructuring, Diluted 18.0  
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.