Description of Business and Summary of Significant Accounting Policies - Schedule of Disaggregates Trucking Revenue from Contracts with Customers (ASC 606-10-50) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Total revenue	$ 304,047	$ 229,275
Trucking [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Total revenue	268,913	228,276
Trucking [Member] | USPS Revenue [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Total revenue	235,926	200,494
Trucking [Member] | Freight Revenue [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Total revenue	26,578	26,179
Trucking [Member] | Other Revenue [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Total revenue	$ 6,409	$ 1,603