Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-19-000042-index-headers.html | 2019-11-12 15:27:59 | |
| 0000799233-19-000042-index.html | 2019-11-12 15:27:59 | |
| 0000799233-19-000042.txt | 2019-11-12 15:27:59 | |
 0000799233-19-000042-xbrl.zip | 259958 | 2019-11-12 15:27:59 |
| exhibit3112019q3.htm | 23575 | 2019-11-12 15:27:59 |
| exhibit3122019q3.htm | 24725 | 2019-11-12 15:27:59 |
| exhibit3212019q3.htm | 9724 | 2019-11-12 15:27:59 |
| exhibit3222019q3.htm | 10609 | 2019-11-12 15:27:59 |
| FilingSummary.xml | 27534 | 2019-11-12 15:27:59 |
| Financial_Report.xlsx | 57415 | 2019-11-12 15:27:59 |
| htld-20190930.xsd | 35699 | 2019-11-12 15:27:59 |
| htld-20190930_cal.xml | 58988 | 2019-11-12 15:27:59 |
| htld-20190930_def.xml | 160952 | 2019-11-12 15:27:59 |
| htld-20190930_lab.xml | 561954 | 2019-11-12 15:27:59 |
| htld-20190930_pre.xml | 310505 | 2019-11-12 15:27:59 |
| htld2019q310q.htm | 1182532 | 2019-11-12 15:27:59 |
| htld2019q310q_htm.xml | 664221 | 2019-11-12 15:27:59 |
| MetaLinks.json | 473885 | 2019-11-12 15:27:59 |
| millistransferacquisit.htm | 563372 | 2019-11-12 15:27:59 |
| R1.htm | 52476 | 2019-11-12 15:27:59 |
| R10.htm | 5750 | 2019-11-12 15:27:59 |
| R11.htm | 12035 | 2019-11-12 15:27:59 |
| R12.htm | 7090 | 2019-11-12 15:27:59 |
| R13.htm | 24208 | 2019-11-12 15:27:59 |
| R14.htm | 6755 | 2019-11-12 15:27:59 |
| R15.htm | 26171 | 2019-11-12 15:27:59 |
| R16.htm | 47189 | 2019-11-12 15:27:59 |
| R17.htm | 8413 | 2019-11-12 15:27:59 |
| R18.htm | 47117 | 2019-11-12 15:27:59 |
| R19.htm | 12472 | 2019-11-12 15:27:59 |
| R2.htm | 105971 | 2019-11-12 15:27:59 |
| R20.htm | 24987 | 2019-11-12 15:27:59 |
| R21.htm | 8837 | 2019-11-12 15:27:59 |
| R22.htm | 22061 | 2019-11-12 15:27:59 |
| R23.htm | 5722 | 2019-11-12 15:27:59 |
| R24.htm | 4908 | 2019-11-12 15:27:59 |
| R25.htm | 49620 | 2019-11-12 15:27:59 |
| R26.htm | 21267 | 2019-11-12 15:27:59 |
| R27.htm | 27455 | 2019-11-12 15:27:59 |
| R28.htm | 45692 | 2019-11-12 15:27:59 |
| R29.htm | 44603 | 2019-11-12 15:27:59 |
| R3.htm | 21985 | 2019-11-12 15:27:59 |
| R30.htm | 12229 | 2019-11-12 15:27:59 |
| R31.htm | 20368 | 2019-11-12 15:27:59 |
| R32.htm | 4451 | 2019-11-12 15:27:59 |
| R33.htm | 15257 | 2019-11-12 15:27:59 |
| R34.htm | 12650 | 2019-11-12 15:27:59 |
| R35.htm | 47256 | 2019-11-12 15:27:59 |
| R36.htm | 11843 | 2019-11-12 15:27:59 |
| R37.htm | 42961 | 2019-11-12 15:27:59 |
| R38.htm | 32291 | 2019-11-12 15:27:59 |
| R39.htm | 9267 | 2019-11-12 15:27:59 |
| R4.htm | 69689 | 2019-11-12 15:27:59 |
| R40.htm | 35148 | 2019-11-12 15:27:59 |
| R41.htm | 42369 | 2019-11-12 15:27:59 |
| R42.htm | 42754 | 2019-11-12 15:27:59 |
| R43.htm | 11659 | 2019-11-12 15:27:59 |
| R44.htm | 17409 | 2019-11-12 15:27:59 |
| R45.htm | 4526 | 2019-11-12 15:27:59 |
| R46.htm | 5970 | 2019-11-12 15:27:59 |
| R5.htm | 32912 | 2019-11-12 15:27:59 |
| R6.htm | 3205 | 2019-11-12 15:27:59 |
| R7.htm | 87069 | 2019-11-12 15:27:59 |
| R8.htm | 14020 | 2019-11-12 15:27:59 |
| R9.htm | 5336 | 2019-11-12 15:27:59 |
| report.css | 2767 | 2019-11-12 15:27:59 |
| Show.js | 1085 | 2019-11-12 15:27:59 |