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Related Party Transactions - Additional Information (Details) - Old Dominion Truck Leasing Inc [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |
Rental service charge | $ 6,000 | $ 12,000
Purchase of maintenance and other services | $ 110,000 | $ 254,000

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