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Operating Leases Operating Leases (Details) (USD $) | 0 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 08, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | $ 7,087,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 5,216,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 3,853,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 3,408,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |
Operating Leases, Future Minimum Payments Due |  |  | 19,564,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Operating Leases, Rent Expense |  |  | 8,300,000 us-gaap_LeaseAndRentalExpense | 1,300,000 us-gaap_LeaseAndRentalExpense |
Related Party Transaction, Expenses from Transactions with Related Party |  | 7,208,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | 49,882,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty |  |
Payments to Acquire Property, Plant, and Equipment | 2,800,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 204,973,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 135,195,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 66,811,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Related Party [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 6,580,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 5,010,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 3,718,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 3,408,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Future Minimum Payments Due |  |  | 18,716,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |
Operating Leases, Rent Expense |  | 930,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember | 6,842,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember | 930,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |
Payments to Acquire Property, Plant, and Equipment | 2,800,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember |  |  |
Equipment Leased to Other Party [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 507,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 206,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 135,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Operating Leases, Future Minimum Payments Due |  |  | 848,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = us-gaap_EquipmentLeasedToOtherPartyMember |  |
Terminal Facilities [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Rent Expense |  |  | 4,200,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember | 700,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember |
Terminal Facilities [Member] | Related Party [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Rent Expense |  | 572,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember | 3,930,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  | $ 3,900,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember | $ 600,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_LeaseArrangementTypeAxis = htld_RelatedPartyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = htld_TerminalFacilitiesMember |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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