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Acquisition of Gordon Trucking, Inc. (Details) (USD $) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2017 | Nov. 01, 2016 | Dec. 31, 2015 | Nov. 01, 2015 | Nov. 01, 2014 | Nov. 11, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
change in estimate financial impact, per share, net of tax | $ 0.02 htld_Changeinestimatefinancialimpactpersharenetoftax |  |  |  |  |  |  |
Total acquisition purchase price |  | 300,000,000 htld_Totalacquisitionpurchaseprice |  |  |  |  |  |
Payments to Acquire Intangible Assets |  | (15,000,000)us-gaap_PaymentsToAcquireIntangibleAssets |  |  |  |  |  |
Fair Value of Stock in Escrow Related To Acquisition of Business |  |  |  |  |  |  |  | 24,000,000 htld_FairValueofStockinEscrowRelatedToAcquisitionofBusiness
Fair Value of Cash in Escrow as a Result of Business Combination |  |  |  |  |  |  |  | 6,000,000 htld_FairValueofCashinEscrowasaResultofBusinessCombination
Noncash or Part Noncash Acquisition, Debt Assumed |  | 148,000,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  | 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  | 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | 225,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 6,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh | 20,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh | 8,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh |  | 6,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh |  |  | 20,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  | 1,500,000 htld_Amountrecordedforunsettledworkingcapitaladjustment
Cash Acquired from Acquisition |  | (20,000,000)us-gaap_CashAcquiredFromAcquisition |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | 2,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |  |  |
Gordon Trucking Company, Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total acquisition purchase price |  | $ 285,000,000 htld_Totalacquisitionpurchaseprice / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |  |  |  |  |  |

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