Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Disaggregated Revenue (Details)

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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from operations $ 1,400,046 $ 1,058,166 $ 3,845,970 $ 2,941,740
LTL Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from operations 1,378,339 1,044,640 3,787,721 2,903,140
Other Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from operations $ 21,707 $ 13,526 $ 58,249 $ 38,600