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Acquisitions - Consolidated Statements of Operations (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenues and other income    
Affiliate services $ 290.6 $ 189.4 [1]
Type of Revenue [Extensible List] hesm:AffiliateServicesMember hesm:AffiliateServicesMember [1]
Other income $ 0.2 $ 0.2 [1]
Total revenues 290.8 189.6 [1]
Costs and expenses    
Operating and maintenance expenses (exclusive of depreciation shown separately below) 91.9 54.3 [1]
Depreciation expense 38.5 33.6 [1]
General and administrative expenses 7.6 5.9 [1]
Total costs and expenses 138.0 93.8 [1]
Income from operations 152.8 95.8 [1]
Interest expense, net 24.8 15.0 [1]
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    
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Net income attributable to Hess Midstream Partners per limited partner unit [1]   $ 0.32
Weighted average limited partner units outstanding, Basic:    
Units outstanding prior to the Restructuring, Basic [1]   27.3
Weighted average limited partner units outstanding, Diluted:    
Units outstanding prior to the Restructuring, Diluted [1]   27.4
Subordinated Units    
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Net income attributable to Hess Midstream Partners per limited partner unit [1]   $ 0.32
Weighted average limited partner units outstanding, Basic:    
Units outstanding prior to the Restructuring, Basic [1]   27.3
Weighted average limited partner units outstanding, Diluted:    
Units outstanding prior to the Restructuring, Diluted [1]   27.3
Partnership as Previously Reported    
Revenues and other income    
Affiliate services   $ 174.0
Type of Revenue [Extensible List]   hesm:AffiliateServicesMember
Other income   $ 0.2
Total revenues   174.2
Costs and expenses    
Operating and maintenance expenses (exclusive of depreciation shown separately below)   41.9
Depreciation expense   32.6
General and administrative expenses   4.0
Total costs and expenses   78.5
Income from operations   95.7
Interest expense, net   0.4
Net income   95.3
Less: Net income (loss) attributable to noncontrolling interest   77.2
Net income attributable to Hess Midstream LP   18.1
Less: General partner's interest in net income   0.8
Limited partners' interest in net income   $ 17.3
Partnership as Previously Reported | Common Units    
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Net income attributable to Hess Midstream Partners per limited partner unit   $ 0.32
Weighted average limited partner units outstanding, Basic:    
Units outstanding prior to the Restructuring, Basic   27.3
Weighted average limited partner units outstanding, Diluted:    
Units outstanding prior to the Restructuring, Diluted   27.4
Partnership as Previously Reported | Subordinated Units    
Net income attributable to Hess Midstream LP per limited partner unit (basic and diluted):    
Net income attributable to Hess Midstream Partners per limited partner unit   $ 0.32
Weighted average limited partner units outstanding, Basic:    
Units outstanding prior to the Restructuring, Basic   27.3
Weighted average limited partner units outstanding, Diluted:    
Units outstanding prior to the Restructuring, Diluted   27.3
Restatement Adjustment | Acquisition of HIP    
Revenues and other income    
Affiliate services   $ 15.4
Type of Revenue [Extensible List]   hesm:AffiliateServicesMember
Total revenues   $ 15.4
Costs and expenses    
Operating and maintenance expenses (exclusive of depreciation shown separately below)   12.4
Depreciation expense   1.0
General and administrative expenses   1.9
Total costs and expenses   15.3
Income from operations   0.1
Interest expense, net   14.6
Net income   (14.5)
Less: Net income (loss) attributable to net parent investment   $ (14.5)
[1] The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.