Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING REVENUE	$ 871,355us-gaap_Revenues	$ 582,257us-gaap_Revenues	$ 545,745us-gaap_Revenues
Operating Expenses
Salaries, wages and benefits	278,126us-gaap_LaborAndRelatedExpense	178,736us-gaap_LaborAndRelatedExpense	167,073us-gaap_LaborAndRelatedExpense
Rent and purchased transportation	51,950htld_RentAndPurchasedTransportation	12,808htld_RentAndPurchasedTransportation	6,273htld_RentAndPurchasedTransportation
Fuel	219,261us-gaap_FuelCosts	172,315us-gaap_FuelCosts	168,981us-gaap_FuelCosts
Operations and maintenance	39,052us-gaap_CostOfServicesMaintenanceCosts	22,345us-gaap_CostOfServicesMaintenanceCosts	25,282us-gaap_CostOfServicesMaintenanceCosts
Operating taxes and licenses	20,370	10,516	8,694
Insurance and claims	17,946	14,888	14,906
Communications and utilities	6,494	3,552	2,953
Depreciation and amortization	108,566	68,908	57,158
Other operating expenses	31,266us-gaap_OtherCostAndExpenseOperating	19,157us-gaap_OtherCostAndExpenseOperating	14,633us-gaap_OtherCostAndExpenseOperating
Gain on disposal of property and equipment	(33,544)us-gaap_GainLossOnDispositionOfAssets	(33,270)us-gaap_GainLossOnDispositionOfAssets	(15,109)us-gaap_GainLossOnDispositionOfAssets
Total operating expenses	739,487us-gaap_CostsAndExpenses	469,955us-gaap_CostsAndExpenses	450,844us-gaap_CostsAndExpenses
Operating income	131,868us-gaap_OperatingIncomeLoss	112,302us-gaap_OperatingIncomeLoss	94,901us-gaap_OperatingIncomeLoss
Interest income	195us-gaap_InvestmentIncomeInterest	462us-gaap_InvestmentIncomeInterest	674us-gaap_InvestmentIncomeInterest
Interest expense	(446)us-gaap_InterestExpenseDebt	(208)us-gaap_InterestExpenseDebt	0us-gaap_InterestExpenseDebt
Income before income taxes	131,617	112,556	95,575
Federal and state income taxes	46,783us-gaap_IncomeTaxExpenseBenefit	41,974us-gaap_IncomeTaxExpenseBenefit	34,034us-gaap_IncomeTaxExpenseBenefit
Net income	84,834us-gaap_NetIncomeLoss	70,582us-gaap_NetIncomeLoss	61,541us-gaap_NetIncomeLoss
Other comprehensive income, net of tax	0	1,284	1,797
Comprehensive income	$ 84,834us-gaap_ComprehensiveIncomeNetOfTax	$ 71,866us-gaap_ComprehensiveIncomeNetOfTax	$ 63,338us-gaap_ComprehensiveIncomeNetOfTax
Net income per share
Basic	$ 0.97us-gaap_EarningsPerShareBasic	$ 0.83us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic
Diluted	$ 0.96us-gaap_EarningsPerShareDiluted	$ 0.83us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding
Basic	87,748	85,209	85,892
Diluted	87,923	85,441	86,201
Dividends declared per share	$ 0.08	$ 0.08	$ 1.08

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Aggregate dividends declared during the period for each share of common stock outstanding.

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