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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 10, 2012 | Sep. 30, 2001
Share Repurchases [Abstract] |  |  |  |  |
Stock Repurchase Shares Authorized | 3,225 htld_StockRepurchaseShares |  |  | 5,000 htld_StockRepurchaseShares | 15,400 htld_StockRepurchaseShares
Treasury Stock, Shares, Acquired | 0 us-gaap_TreasuryStockSharesAcquired |  | 1,775 us-gaap_TreasuryStockSharesAcquired |  |
Repurchases of Common Stock | $ 0 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 0 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 24,190 us-gaap_PaymentsForRepurchaseOfCommonStock |  |

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- Definition The number of shares authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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