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