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U.K. Pension Plan Net Periodic Service Cost (Details) - Freightliner U.K. Pension Plan [Member]
£ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
GBP (£)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
GBP (£)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]                    
Company contribution % required in shared cost arrangement         60.00% 60.00%        
Participant contribution % required in shared cost arrangement         40.00% 40.00%        
Service cost £ 2,988 $ 3,823 £ 2,395 $ 3,436 £ 5,976 $ 7,526 £ 4,790 $ 6,863    
Interest cost 1,978 2,531 2,227 3,197 3,956 4,982 4,504 6,385    
Expected return on plan assets (3,307) (4,232) (2,847) (4,085) (6,614) (8,329) (5,694) (8,159)    
Net periodic benefit cost £ 1,659 $ 2,122 £ 1,775 $ 2,548 3,318 4,179 £ 3,600 $ 5,089    
Defined Benefit Plan, Contribution by Employer         £ 3,000 $ 3,900        
Scenario, Forecast [Member]                    
Defined Benefit Plan Disclosure [Line Items]                    
Defined Benefit Plan, Expected Contributions in Current Fiscal Year                 £ 4,100 $ 5,300