Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 84,834us-gaap_NetIncomeLoss	$ 70,582us-gaap_NetIncomeLoss	$ 61,541us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	109,629	69,649	57,821
Deferred income taxes	39,067	10,262	(5,751)
Loss on sale of investments	0us-gaap_LossOnSaleOfInvestments	200us-gaap_LossOnSaleOfInvestments	0us-gaap_LossOnSaleOfInvestments
Amortization of stock-based compensation	1,134us-gaap_ShareBasedCompensation	1,184us-gaap_ShareBasedCompensation	2,379us-gaap_ShareBasedCompensation
Gain on disposal of property and equipment	(33,544)us-gaap_GainLossOnDispositionOfAssets	(33,270)us-gaap_GainLossOnDispositionOfAssets	(15,109)us-gaap_GainLossOnDispositionOfAssets
Changes in certain working capital items:
Trade receivables	7,366us-gaap_IncreaseDecreaseInReceivables	7,834us-gaap_IncreaseDecreaseInReceivables	(2,357)us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other current assets	(1,009)	904	5,688
Accounts payable, accrued liabilities, and accrued expenses	(19,017)	(9,722)	953
Accrued income taxes	(16,007)	(6,388)	(2,992)
Net cash provided by operating activities	172,453	111,235	102,173
INVESTING ACTIVITIES
Proceeds from sale of property and equipment	91,266	92,313	29,184
Purchases of property and equipment, net of trades	(204,973)	(135,195)	(66,811)
Maturity, calls and sales of investments	0	21,100	32,350
Acquisition of business, net of cash acquired	(3,011)	(110,900)	0
Change in other assets	1,239	(825)	(704)
Net cash (used in) provided by investing activities	(115,479)	(133,507)	(5,981)
FINANCING ACTIVITIES
Cash dividends paid	(7,034)us-gaap_PaymentsOfDividendsCommonStock	(6,861)us-gaap_PaymentsOfDividendsCommonStock	(91,934)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from Lines of Credit	19,100us-gaap_ProceedsFromLinesOfCredit	75,000us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Repayments of Lines of Credit	(69,500)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Repayments on debt assumed	0us-gaap_RepaymentsOfLongTermDebt	(147,942)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Repurchases of common stock	0	0	(24,190)
Net cash used in financing activities	(57,434)	(79,803)	(116,124)
Net (decrease) increase in cash and cash equivalents	(460)	(102,075)	(19,932)
CASH AND CASH EQUIVALENTS
Beginning of period	17,763	119,838	139,770
End of period	17,303	17,763	119,838
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest paid	484us-gaap_InterestPaid	4us-gaap_InterestPaid	0us-gaap_InterestPaid
Cash paid during the period for income taxes, net of refunds	23,723us-gaap_IncomeTaxesPaidNet	38,101us-gaap_IncomeTaxesPaidNet	42,776us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:
Fair value of revenue equipment traded	3,393htld_FairValueOfRevenueEquipmentTraded	2,138htld_FairValueOfRevenueEquipmentTraded	0htld_FairValueOfRevenueEquipmentTraded
Purchased property and equipment in accounts payable	230	11,191	698
Issuance of common stock in acquisition of business	$ 0	$ 41,100

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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