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| 0000799233-18-000048.txt | 2018-11-05 19:11:56 | |
 0000799233-18-000048-xbrl.zip | 188295 | 2018-11-05 19:11:56 |
| exhibit1012018q3.htm | 159568 | 2018-11-05 19:11:56 |
| exhibit3112018q3.htm | 23574 | 2018-11-05 19:11:56 |
| exhibit3122018q3.htm | 24724 | 2018-11-05 19:11:56 |
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| exhibit3222018q3.htm | 10608 | 2018-11-05 19:11:56 |
| FilingSummary.xml | 25719 | 2018-11-05 19:11:56 |
| Financial_Report.xlsx | 56020 | 2018-11-05 19:11:56 |
| htld-20180930.xsd | 33541 | 2018-11-05 19:11:56 |
| htld-20180930_cal.xml | 58061 | 2018-11-05 19:11:56 |
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| htld-20180930_lab.xml | 494266 | 2018-11-05 19:11:56 |
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| htld2018q310q.htm | 1002882 | 2018-11-05 19:11:56 |
| htld2018q310q_htm.xml | 576891 | 2018-11-05 19:11:56 |
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| report.css | 2767 | 2018-11-05 19:11:56 |
| Show.js | 1085 | 2018-11-05 19:11:56 |