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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 1,126,515	$ 987,364
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	1,109,621	974,431
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 16,894	$ 12,933

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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