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Acquisition of Gordon Trucking, Inc. Allocation of Purchase Price (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Cash Acquired from Acquisition | $ (20,000,000)us-gaap_CashAcquiredFromAcquisition |
Cash paid (before netting $20 million cash acquired) | 115,900,000 us-gaap_PaymentsToAcquireBusinessesGross |
Stock Issued During Period, Shares, Acquisitions | 2,860,000 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |
Earn Out Agreement | 13,600,000 htld_Businesscombinationcontingentconsiderationfairvalue | 13,600,000 htld_Businesscombinationcontingentconsiderationfairvalue
Common Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Gordon Trucking Company, Inc [Member] |  |
Business Acquisition [Line Items] |  |
Cash paid (before netting $20 million cash acquired) | 130,900,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Value of common stock issued (2.86 million shares) | 41,100,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Total fair value of consideration transferred (before netting $20 million cash acquired), excluding debt assumed | 172,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Historical book value of GTI assets and liabilities | 92,125,000 us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Property, Plant, and Equipment | (17,912,000)us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Other assets | 3,450,000 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Liabilities | (18,576,000)us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Fair value of tangible net assets acquired | 59,087,000 us-gaap_FairValueOfAssetsAcquired / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Identifiable intangibles at acquisition-date fair value | 19,042,000 us-gaap_NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ 93,871,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = htld_GordonTruckingCompanyIncMember |

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