Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			3
Operating Revenue	$ 825,253	$ 663,918	$ 1,468,755	$ 1,343,601
DHL [Member]
Segment Reporting Information [Line Items]
Operating Revenue	$ 151,900	$ 87,400	$ 250,200	$ 177,100