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Operating Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating Leased Assets [Line Items] |  |  |  |
Operating Leases, Rent Expense | $ 1,700 | $ 0 | $ 3,600 | $ 0
Terminal Facilities |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating Leases, Rent Expense | 1,200 | 500 | 2,600 | 1,000
Terminal Facilities | Related Party |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating Leases, Rent Expense | 214 | 392 | 461 | 806
Related Party Transaction, Expenses from Transactions with Related Party | $ 200 | $ 400 | $ 500 | $ 800

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 No definition available. + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=htld_TerminalFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |