Subsequent Events (Details) - May 03, 2017 - Subsequent Event [Member] £ in Millions, $ in Millions	GBP (£) a employee seaport	USD ($) a employee seaport
Freightliner [Member]
Subsequent Event [Line Items]
Number of trucks	250	250
Pentalver Transport Limited [Member]
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	May 03, 2017	May 03, 2017
Payments to Acquire Businesses, Gross	£ 97.7	$ 126.2
Number of Major Seaports | seaport	4	4
Number of trucks	150	150
Number of employees	600	600
Pentalver Transport Limited [Member] | Minimum [Member]
Subsequent Event [Line Items]
Number of Acres Providing Storage for Loaded and Empty Containers | a	100	100