Operations and Summary of Significant Accounting Policies - Goodwill Roll Forward (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Goodwill [Roll Forward] | ||
| Balance, beginning of period | $ 244,982 | $ 215,699 |
| Acquisitions | 21,770 | 29,283 |
| Balance, ending of period | 266,752 | 244,982 |
| Expedited Freight | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning of period | 165,268 | 137,034 |
| Acquisitions | 4,020 | 28,234 |
| Balance, ending of period | 169,288 | 165,268 |
| Intermodal | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning of period | 79,714 | 78,665 |
| Acquisitions | 17,750 | 1,049 |
| Balance, ending of period | $ 97,464 | $ 79,714 |
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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