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v3.21.2

Partners' Capital and Distributions - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2021
Partners Capital Notes [Abstract] |
Period of cash distribution to shareholders | 45 days

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- Definition Period of distribution of cash to shareholders. + References No definition available. + Details
Name: | hesm_PeriodOfDistributionOfCashToShareholders
Namespace Prefix: | hesm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PartnersCapitalNotesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration