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Acquisitions, Goodwill, Intangible Assets and Other Long-Lived Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible Assets [Line Items] |
Schedule of Intangible Assets | The Company amortizes certain acquired identifiable intangible assets on a straight-line basis over their estimated useful lives, which range from 1 to 20 years. The acquired intangible assets have a weighted-average useful life as follows:
Intangible Assets |  | Weighted-Average Useful Life
Customer relationships |  | 15 years
Non-compete agreements |  | 4 years
Trade names |  | 4 years
Changes in Carrying Amount of Acquired Intangible Assets | Changes in the carrying amount of acquired intangible assets during 2020 and 2019 are summarized as follows:
| December 31, 2020 |  | December 31, 2019
| Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Customer relationships 1 | $ | 228,416 |  |  | $ | (85,930) |  |  | $ | 142,486 |  |  | $ | 196,225 |  |  | $ | (73,868) |  |  | $ | 122,357 |
Non-compete agreements | 8,125 |  |  | (5,579) |  |  | 2,546 |  |  | 6,652 |  |  | (4,152) |  |  | 2,500 |
Trade names | 1,500 |  |  | (1,500) |  |  | — |  |  | 1,500 |  |  | (1,500) |  |  | — |
Total | $ | 238,041 |  |  | $ | (93,009) |  |  | $ | 145,032 |  |  | $ | 204,377 |  |  | $ | (79,520) |  |  | $ | 124,857 |
1 Carrying value as of December 31, 2020 and 2019 is inclusive of $16,501 of accumulated impairment.
Business Acquisition [Line Items] |
Weighted-Average Assumptions | The weighted-average assumptions under the Monte Carlo simulation model were as follows for the year ended December 31, 2020 and 2019:
|  | FSA Earn-Out
|  | December 31, 2020 | December 31, 2019 |
Risk-free rate |  | 1.4% | 2.2% |
Revenue discount rate |  | 3.2% | 4.4% |
Revenue volatility |  | 8.0% | 5.0% |
Purchase Price Allocation | Assets acquired and liabilities assumed as of the acquisition date are presented in the following table:
|  |  | MMT |  | Southwest |  | FSA |  | O.S.T. |  | Linn Star |  | CLW
|  |  | July 25, 2018 |  | October 28, 2018 |  | April 21, 2019 |  | July 14, 2019 |  | January 12, 2020 |  | October 11, 2020
Tangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | $ | — |  |  | $ | — |  |  | $ | 202 |  |  | $ | — |  |  | $ | 1,308 |  |  | $ | — |
Other receivables |  |  | — |  |  | — |  |  | 1,491 |  |  | — |  |  | — |  |  | — |
Prepaid expenses and other current assets |  |  |  |  |  |  | — |  |  | — |  |  | 1,182 |  |  | — |
Property and equipment |  |  | 81 |  |  | 933 |  |  | 40 |  |  | 10,371 |  |  | 605 |  |  | — |
Right-of-use lease assets |  |  | — |  |  | — |  |  | 3,209 |  |  | 1,672 |  |  | 10,011 |  |  | 811 |
Total tangible assets |  |  | 81 |  |  | 933 |  |  | 4,942 |  |  | 12,043 |  |  | 13,106 |  |  | 811 |
Intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Non-compete agreements |  |  | 43 |  |  | 650 |  |  | 900 |  |  | 850 |  |  | 450 |  |  | 1,000 |
Customer relationships |  |  | 1,659 |  |  | 9,200 |  |  | 17,900 |  |  | 5,700 |  |  | 29,800 |  |  | 1,500 |
Goodwill |  |  | 1,954 |  |  | 5,467 |  |  | 19,963 |  |  | 2,050 |  |  | 25,234 |  |  | 3,000 |
Total intangible assets |  |  | 3,656 |  |  | 15,317 |  |  | 38,763 |  |  | 8,600 |  |  | 55,484 |  |  | 5,500 |
Total assets acquired |  |  | 3,737 |  |  | 16,250 |  |  | 43,705 |  |  | 20,643 |  |  | 68,590 |  |  | 6,311 |
Liabilities assumed: |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  | — |  |  | — |  |  | 8,466 |  |  | — |  |  | 1,340 |  |  | — |
Other liabilities |  |  | — |  |  | — |  |  | 5,030 |  |  | — |  |  | — |  |  | — |
Operating lease liabilities |  |  | — |  |  | — |  |  | 3,209 |  |  | 1,672 |  |  | 10,011 |  |  | 811 |
Finance lease obligations |  |  | — |  |  | — |  |  | — |  |  | 6,971 |  |  | — |  |  | — |
Total liabilities assumed |  |  | — |  |  | — |  |  | 16,705 |  |  | 8,643 |  |  | 11,351 |  |  | — |
Net assets acquired |  |  | $ | 3,737 |  |  | $ | 16,250 |  |  | $ | 27,000 |  |  | $ | 12,000 |  |  | $ | 57,239 |  |  | $ | 5,500 |
Weighted-Average Useful Life of Acquired Intangible Assets | The weighted-average useful life of acquired intangible assets as of the acquisition date are summarized in the following table:
|  |  |  |  |  |  |  |  | FSA |  | O.S.T. |  | Linn Star |  | CLW
Customer relationships |  |  |  |  |  |  |  |  | 15 years |  | 10 years |  | 15 years |  | 7 years
Non-compete agreements |  |  |  |  |  |  |  |  | 5 years |  | 3 years |  | 1 year |  | 5 years
Goodwill [Line Items] |
Schedule of Goodwill | Changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 are summarized as follows:
| Expedited Freight |  | Intermodal |  | Consolidated
Balance as of December 31, 2018 | $ | 117,071 |  |  | $ | 76,615 |  |  | $ | 193,686 |
Acquisitions | 19,963 |  |  | 2,050 |  |  | 22,013 |
Balance as of December 31, 2019 | 137,034 |  |  | 78,665 |  |  | 215,699 |
Acquisitions | 28,234 |  |  | 1,049 |  |  | 29,283 |
Balance as of December 31, 2020 | $ | 165,268 |  |  | $ | 79,714 |  |  | $ | 244,982 |

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