XML 44 R33.htm IDEA: XBRL DOCUMENT
v3.25.1

Prepaid Tires, Property, Equipment and Depreciation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Property, Plant and Equipment [Line Items] |  |
Amortization Period of Tires | two years |
Sold revenue equipment in other current assets | $ 0 | $ 900
Tractors [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant, and Equipment, Salvage Value | 15 |
Trailers [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant, and Equipment, Salvage Value | $ 4 |

X
- Definition Amortization Period of Tires + References No definition available. + Details
Name: | htld_AmortizationPeriodOfTires
Namespace Prefix: | htld_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (Decrease) of Restricted Cash and Investments + References No definition available. + Details
Name: | htld_IncreaseDecreaseOfRestrictedCashAndInvestments
Namespace Prefix: | htld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose). + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentSalvageValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=sic_Z3537
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=sic_Z3715
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |