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v3.22.0.1

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Empower Ltd [Member] |  |
Fixed commitment | $ 50 | $ 50

X
- Definition Fixed commitment. + References No definition available. + Details
Name: | hlly_FixedCommitment
Namespace Prefix: | hlly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=hlly_EmpowerLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |