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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	4 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Warrants to purchase	13,000,000	13,000,000
FDIC insured amount	$ 250,000	$ 250,000

X

- Definition

The number of warrants to purchase.

+ References

No definition available.

+ Details

Name:	hlly_WarrantsToPurchase
Namespace Prefix:	hlly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant