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Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Lessee, Lease, Description [Line Items]
Finance lease right of use asset	$ 694		$ 694		$ 782
Operating lease right of use asset	19,971		19,971		21,678
Accumulated amortization	200		200		$ 100
Impairment of leases	$ 0	$ 0	$ 0	$ 0
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)			1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)			8 years
Renewal term (in years)			5 years

X

- Definition

The amount of accumulated depreciation for right-of-use asset under finance lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrth_
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Balance Type:	credit
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X

- Definition

The remaining lease term for leases of the lessee.

+ References

No definition available.

+ Details

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X

- Definition

The renewal term for leases of the lessee.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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+ Details

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

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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Period Type:	instant

X

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