XML 57 R36.htm IDEA: XBRL DOCUMENT v3.21.2

Fair Value Measurements (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
FairValue Liabilities Measured on Recurring Basis [Abstract]
Fixed commitment	$ 50	$ 50

X

- Definition

Fair Value Liabilities Measured On Recurring Basis [Abstract]

+ References

No definition available.

+ Details

Name:	hlly_FairValueLiabilitiesMeasuredOnRecurringBasisAbstract
Namespace Prefix:	hlly_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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