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