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v2.4.1.9

Long-Term Debt (Details) (USD $) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Nov. 01, 2016 | Nov. 01, 2015 | Jan. 31, 2015 | Nov. 01, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Line of Credit | $ 24,600,000 us-gaap_LineOfCredit |  |  | $ 0 us-gaap_LineOfCredit |  | $ 75,000,000 us-gaap_LineOfCredit
Debt Instrument, Interest Rate, Stated Percentage | 0.787%us-gaap_DebtWeightedAverageInterestRate |  |  |  |  | 0.793%us-gaap_DebtWeightedAverageInterestRate
Line of Credit Facility, Maximum Borrowing Capacity |  | 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  | 225,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Debt Instrument, Covenant, Leverage Ratio | 2 htld_DebtInstrumentCovenantLeverageRatio |  |  |  |  |
Debt Covenant, Minimum Net Income Requirement | 1 htld_DebtCovenantMinimumNetIncomeRequirement |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 196,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |  |  |  | 169,500,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Debt Instrument, Covenant Description | 200,000,000 htld_DebtCovenantMinimumTangibleNetWorth |  |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 4,400,000 htld_Lettersofcreditoutstandingonalineofcredit |  |  |  |  | $ 5,500,000 htld_Lettersofcreditoutstandingonalineofcredit
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Prime Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |  |  |

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- Definition Debt Covenant, Minimum Net Income Requirement + References No definition available. + Details
Name: | htld_DebtCovenantMinimumNetIncomeRequirement
Namespace Prefix: | htld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Debt Covenant, Minimum Tangible Net Worth + References No definition available. + Details
Name: | htld_DebtCovenantMinimumTangibleNetWorth
Namespace Prefix: | htld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Debt Instrument, Covenant, Leverage Ratio + References No definition available. + Details
Name: | htld_DebtInstrumentCovenantLeverageRatio
Namespace Prefix: | htld_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition letters of credit outstanding on a line of credit + References No definition available. + Details
Name: | htld_Lettersofcreditoutstandingonalineofcredit
Namespace Prefix: | htld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |