U.K. Pension Plan Net Periodic Benefit Cost (Details) - Freightliner U.K. Pension Plan [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10,911	$ 11,816
Interest cost	8,475	10,992
Expected return on plan assets	(12,029)	(14,050)
Exchange rate changes	291	862
Net periodic benefit cost	$ 7,648	$ 9,620