Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-15-000005-index-headers.html | 2015-03-02 13:34:22 | |
| 0000799233-15-000005-index.html | 2015-03-02 13:34:22 | |
| 0000799233-15-000005.txt | 2015-03-02 13:34:22 | |
 0000799233-15-000005-xbrl.zip | 200751 | 2015-03-02 13:34:22 |
| a2014exhibitno21.htm | 8045 | 2015-03-02 13:34:22 |
| exhibit3112014q4.htm | 23513 | 2015-03-02 13:34:22 |
| exhibit3122014q4.htm | 24661 | 2015-03-02 13:34:22 |
| exhibit3212014q4.htm | 9697 | 2015-03-02 13:34:22 |
| exhibit3222014q4.htm | 10584 | 2015-03-02 13:34:22 |
| FilingSummary.xml | 43392 | 2015-03-02 13:34:22 |
| Financial_Report.xls | 1205351 | 2015-03-02 13:34:22 |
| Financial_Report.xlsx | 188672 | 2015-03-02 13:34:22 |
| htld-20141231.xml | 1321322 | 2015-03-02 13:34:22 |
| htld-20141231.xsd | 56679 | 2015-03-02 13:34:22 |
| htld-20141231_cal.xml | 89508 | 2015-03-02 13:34:22 |
| htld-20141231_def.xml | 241649 | 2015-03-02 13:34:22 |
| htld-20141231_lab.xml | 676764 | 2015-03-02 13:34:22 |
| htld-20141231_pre.xml | 394711 | 2015-03-02 13:34:22 |
| htld201410k.htm | 1595766 | 2015-03-02 13:34:22 |
| R1.htm | 45752 | 2015-03-02 13:34:22 |
| R10.htm | 68380 | 2015-03-02 13:34:22 |
| R11.htm | 60610 | 2015-03-02 13:34:22 |
| R12.htm | 17225 | 2015-03-02 13:34:22 |
| R13.htm | 13058 | 2015-03-02 13:34:22 |
| R14.htm | 121057 | 2015-03-02 13:34:22 |
| R15.htm | 25850 | 2015-03-02 13:34:22 |
| R16.htm | 15491 | 2015-03-02 13:34:22 |
| R17.htm | 47275 | 2015-03-02 13:34:22 |
| R18.htm | 7679 | 2015-03-02 13:34:22 |
| R19.htm | 27595 | 2015-03-02 13:34:22 |
| R2.htm | 165089 | 2015-03-02 13:34:22 |
| R20.htm | 8326 | 2015-03-02 13:34:22 |
| R21.htm | 58351 | 2015-03-02 13:34:22 |
| R22.htm | 6543 | 2015-03-02 13:34:22 |
| R23.htm | 37702 | 2015-03-02 13:34:22 |
| R24.htm | 159409 | 2015-03-02 13:34:22 |
| R25.htm | 47112 | 2015-03-02 13:34:22 |
| R26.htm | 61743 | 2015-03-02 13:34:22 |
| R27.htm | 54852 | 2015-03-02 13:34:22 |
| R28.htm | 10404 | 2015-03-02 13:34:22 |
| R29.htm | 122258 | 2015-03-02 13:34:22 |
| R3.htm | 30369 | 2015-03-02 13:34:22 |
| R30.htm | 19655 | 2015-03-02 13:34:22 |
| R31.htm | 40711 | 2015-03-02 13:34:22 |
| R32.htm | 22631 | 2015-03-02 13:34:22 |
| R33.htm | 57116 | 2015-03-02 13:34:22 |
| R34.htm | 5213 | 2015-03-02 13:34:22 |
| R35.htm | 13785 | 2015-03-02 13:34:22 |
| R36.htm | 7442 | 2015-03-02 13:34:22 |
| R37.htm | 9255 | 2015-03-02 13:34:22 |
| R38.htm | 40936 | 2015-03-02 13:34:22 |
| R39.htm | 6845 | 2015-03-02 13:34:22 |
| R4.htm | 103072 | 2015-03-02 13:34:22 |
| R40.htm | 6472 | 2015-03-02 13:34:22 |
| R41.htm | 7547 | 2015-03-02 13:34:22 |
| R42.htm | 5761 | 2015-03-02 13:34:22 |
| R43.htm | 6058 | 2015-03-02 13:34:22 |
| R44.htm | 7129 | 2015-03-02 13:34:22 |
| R45.htm | 45900 | 2015-03-02 13:34:22 |
| R46.htm | 5610 | 2015-03-02 13:34:22 |
| R47.htm | 11962 | 2015-03-02 13:34:22 |
| R48.htm | 33248 | 2015-03-02 13:34:22 |
| R49.htm | 45584 | 2015-03-02 13:34:22 |
| R5.htm | 68194 | 2015-03-02 13:34:22 |
| R50.htm | 56300 | 2015-03-02 13:34:22 |
| R51.htm | 26545 | 2015-03-02 13:34:22 |
| R52.htm | 17496 | 2015-03-02 13:34:22 |
| R53.htm | 71352 | 2015-03-02 13:34:22 |
| R54.htm | 9449 | 2015-03-02 13:34:22 |
| R55.htm | 66568 | 2015-03-02 13:34:22 |
| R56.htm | 34152 | 2015-03-02 13:34:22 |
| R57.htm | 39401 | 2015-03-02 13:34:22 |
| R58.htm | 40544 | 2015-03-02 13:34:22 |
| R59.htm | 56073 | 2015-03-02 13:34:22 |
| R6.htm | 4816 | 2015-03-02 13:34:22 |
| R60.htm | 26923 | 2015-03-02 13:34:22 |
| R61.htm | 35693 | 2015-03-02 13:34:22 |
| R62.htm | 14253 | 2015-03-02 13:34:22 |
| R63.htm | 57380 | 2015-03-02 13:34:22 |
| R64.htm | 63128 | 2015-03-02 13:34:22 |
| R65.htm | 13538 | 2015-03-02 13:34:22 |
| R66.htm | 7103 | 2015-03-02 13:34:22 |
| R67.htm | 90505 | 2015-03-02 13:34:22 |
| R68.htm | 6592 | 2015-03-02 13:34:22 |
| R69.htm | 48071 | 2015-03-02 13:34:22 |
| R7.htm | 135233 | 2015-03-02 13:34:22 |
| R70.htm | 6039 | 2015-03-02 13:34:22 |
| R71.htm | 42016 | 2015-03-02 13:34:22 |
| R72.htm | 8036 | 2015-03-02 13:34:22 |
| R73.htm | 19568 | 2015-03-02 13:34:22 |
| R8.htm | 84017 | 2015-03-02 13:34:22 |
| R9.htm | 11199 | 2015-03-02 13:34:22 |
| report.css | 2740 | 2015-03-02 13:34:22 |
| Show.js | 1410 | 2015-03-02 13:34:22 |