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Leases - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) impaired_lease | Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items] |  |
Finance lease | $ 129 | $ 595
Operating lease | 25,288 | 18,574
Accumulated amortization | $ 100 | 1,000
Number of leases impaired | impaired_lease | 2 |
Impairment of leases |  | $ 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) | 7 years |
Renewal term (in years) | 5 years |

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- Definition The amount of accumulated depreciation for right-of-use asset under finance lease. + References No definition available. + Details
Name: | hrth_FinanceLeaseRightOfUseAssetAccumulatedDepreciation
Namespace Prefix: | hrth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The remaining lease term for leases of the lessee. + References No definition available. + Details
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Namespace Prefix: | hrth_
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Balance Type: | na
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- Definition The renewal term for leases of the lessee. + References No definition available. + Details
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- Definition Number Of Leases Impaired + References No definition available. + Details
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- 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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
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Period Type: | duration

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- 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 -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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Balance Type: | debit
Period Type: | instant

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- 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 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Balance Type: | na
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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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