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Acquisition of Gordon Trucking, Inc. Assets acquired and liabilities assumed (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Nov. 11, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition [Line Items] |  |  |  |  |
Assets of business combination as percentage total assets | 0.486 htld_Assetsofbusinesscombinationaspercentagetotalassets |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  |
Cash and cash equivalents | $ 17,763 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 17,303 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 119,838 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 139,770 us-gaap_CashAndCashEquivalentsAtCarryingValue
Other current assets | 11,061 us-gaap_OtherAssetsCurrent | 8,992 us-gaap_OtherAssetsCurrent |  |  |
Property, Plant and Equipment, Gross | 622,864 us-gaap_PropertyPlantAndEquipmentGross | 678,566 us-gaap_PropertyPlantAndEquipmentGross |  |  |
Other Assets, Noncurrent | 13,850 us-gaap_OtherAssetsNoncurrent | 12,611 us-gaap_OtherAssetsNoncurrent |  |  |
Finite-Lived Intangible Assets, Gross | 19,042 us-gaap_FiniteLivedIntangibleAssetsGross | 19,042 us-gaap_FiniteLivedIntangibleAssetsGross |  |  |
Goodwill | 98,686 us-gaap_Goodwill | 100,212 us-gaap_Goodwill |  | 4,815 us-gaap_Goodwill |
Assets | 724,841 us-gaap_Assets | 759,994 us-gaap_Assets |  |  |
Other long-term liabilities | 13,618 us-gaap_OtherLiabilitiesNoncurrent | 11,318 us-gaap_OtherLiabilitiesNoncurrent |  |  |
Revenues of business combination as percentage of total revenues | 0.096 htld_Revenuesofbusinesscombinationaspercentageoftotalrevenues |  |  |  |
Gordon Trucking Company, Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | 21,485 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Accounts Receivable, Net |  |  | 45,679 us-gaap_AccountsReceivableNet / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Other current assets |  |  | 14,371 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Property, Plant and Equipment, Gross |  |  | 189,409 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Other Assets, Noncurrent |  |  | 3,916 us-gaap_OtherAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Finite-Lived Intangible Assets, Gross |  |  | 19,042 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Goodwill |  |  | 93,871 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Assets |  |  | 387,773 us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Accounts Payable and Accrued Liabilities |  |  | (29,165)us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Self Insurance Reserve |  |  | (23,821)us-gaap_SelfInsuranceReserve / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Long-term Debt |  |  | (147,942)us-gaap_LongTermDebt / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Other long-term liabilities |  |  | (14,845)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |
Total consideration transferred to acquire a business | $ 172,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |  |  |

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