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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: