Leases - Maturities of Lease Liabilities by Fiscal Year for Operating and Financing Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Leases [Abstract]
2022 remaining	$ 1,161
2023	4,592
2024	4,263
2025	3,970
2026	3,990
Thereafter	16,225
Total lease payments	34,201
Less: imputed interest	(5,300)
Present value of lease liabilities	$ 28,901	$ 31,172

Lessee, operating and finance lease, liability, present value of net minimum payments.

No definition available.

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Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, due.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrtg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, due after year five and thereafter.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Lessee, operating and financing lease, liability, payments, due year five.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, due year four.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, due year three.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, due year two.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrtg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, payments, remainder of fiscal year.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Lessee, operating and financing lease, liability, undiscounted excess amount.

+ References

No definition available.

+ Details

Name:	hrtg_LesseeOperatingAndFinancingLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix:	hrtg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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