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Benefit Plans - Summary of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Parenthetical) (Detail) $ in Thousands | Dec. 31, 2021 USD ($)
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Retirement Benefits [Abstract] |
Defined benefit plan amount to be amortized from accumulated other comprehensive income loss in the next twelve months | $ 21

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- Definition Defined benefit plan amount to be amortized from accumulated other comprehensive income loss in the next twelve months. + References No definition available. + Details
Name: | hlly_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInTheNextTwelveMonths
Namespace Prefix: | hlly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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