XML 44 R30.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Related Party (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Related Party [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The related payments (receipts) with related parties for the three and nine months ended September 30, 2017 and 2016 (in thousands) were as follows:
| Three months ended September 30,
| 2017 |  | 2016
Payments for parts and services | $ | 172 |  |  | $ | 368 |
Terminal lease payments | 421 |  |  | 466 |
| $ | 593 |  |  | $ | 834 |
| Nine months ended September 30,
| 2017 |  | 2016
Payments for tractor purchases | $ | — |  |  | $ | 4,300 |
Receipts for trailer sales | (12 | ) |  | (108 | )
Revenue equipment lease payments | — |  |  | 813 |
Payments for parts and services | 409 |  |  | 1,151 |
Terminal lease payments | 1,227 |  |  | 1,397 |
| $ | 1,624 |  |  | $ | 7,553 |

X
- Definition Related Party [Abstract] + References No definition available. + Details
Name: | htld_RelatedPartyAbstract
Namespace Prefix: | htld_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration