U.K. Pension Plan Net Periodic Service Cost (Details) - Freightliner U.K. Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Company contribution % required in shared cost arrangement				60.00%
Participant contribution % required in shared cost arrangement				40.00%
Service cost	$ 3,436	$ 3,565		$ 6,863	$ 3,775
Interest cost	3,197	2,539		6,385	2,688
Expected return on plan assets	(4,085)	(3,964)		(8,159)	(4,197)
Net periodic benefit cost	$ 2,548	$ 2,140		5,089	$ 2,266
Company's current year contribution				$ 5,200
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			$ 7,500