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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from operations $ 1,319,409 $ 896,210 $ 2,445,924 $ 1,883,574
LTL Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from operations 1,299,760 884,069 2,409,382 1,858,500
Other Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from operations $ 19,649 $ 12,141 $ 36,542 $ 25,074