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Accident and Workers' Compensation Insurance Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Excess Insurance Coverage Limit | $ 75.0 htld_ExcessInsuranceCoverageLimit |
Trust fund requirements | 0.7 htld_TrustFundRequirements |
Restricted Cash and Cash Equivalents, Noncurrent | 12.6 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | 10.5 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Restricted Cash and Investments, Noncurrent | 0.6 us-gaap_RestrictedCashAndInvestmentsNoncurrent |
Restricted Cash and Investments, Current |  | 0.1 us-gaap_RestrictedCashAndInvestmentsCurrent
Letters of Credit Outstanding, Amount | 7.5 us-gaap_LettersOfCreditOutstandingAmount |
Auto liability retention limit minimum [Member] |  |
Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Auto liability retention limit | 0.5 htld_AutoLiabilityRetentionLimit / htld_SelfInsuranceAxis = htld_AutoliabilityretentionlimitminimumMember |
Auto liability retention limit maximum [Member] [Member] |  |
Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Auto liability retention limit | 2.0 htld_AutoLiabilityRetentionLimit / htld_SelfInsuranceAxis = htld_AutoliabilityretentionlimitmaximumMemberMember |
workers compensation retention limit minimum [Member] |  |
Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Workers compensation retention limit | 0.5 htld_WorkersCompensationRetentionLimit / htld_SelfInsuranceAxis = htld_WorkerscompensationretentionlimitminimumMember |
workers compensation retention limit maximum [Member] |  |
Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Workers compensation retention limit | 1.0 htld_WorkersCompensationRetentionLimit / htld_SelfInsuranceAxis = htld_WorkerscompensationretentionlimitmaximumMember |
Gordon Trucking Company, Inc [Member] |  |
Accident and Workers' Compensation Insurance Liabilities [Line Items] |  |
Trust fund requirements | 0.7 htld_TrustFundRequirements / htld_SelfInsuranceAxis = htld_GordonTruckingCompanyIncMember |
Restricted Cash and Cash Equivalents, Noncurrent | $ 0.7 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent / htld_SelfInsuranceAxis = htld_GordonTruckingCompanyIncMember |

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- Definition Auto liability retention limit + References No definition available. + Details
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- Definition Excess Insurance Coverage Limit + References No definition available. + Details
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- Definition Trust fund requirements + References No definition available. + Details
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- Definition Workers compensation retention limit + References No definition available. + Details
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References No definition available. + Details
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