U.K. Pension Plan Net Periodic Service Cost (Details) - Freightliner U.K. Pension Plan [Member] $ in Thousands, £ in Millions	3 Months Ended	6 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 GBP (£)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,286					$ 8,061
Interest cost	3,444					6,132
Expected return on plan assets	(4,241)					(8,438)
Net periodic benefit cost	$ 3,489					$ 5,755
Company's current year contribution		£ 3.7	$ 5,800
Company contribution % required in shared cost arrangement						60.00%
Participant contribution % required in shared cost arrangement						40.00%
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's expected contribution for year				£ 6.3	$ 9,900