Changes in Operations Freightliner Fair Value Assigned to Intangible Assets £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	62 years	62 years	40 years
Freightliner [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	£ 392,233	$ 584,270
Operational network rights
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	100 years	100 years
Operational network rights | Freightliner [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	£ 324,000	$ 482,630
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	100 years	100 years
Operational network rights | Freightliner [Member] | Maximum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Remaining Contractual Term	123 years	123 years
Customer relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	30 years	30 years	36 years
Customer relationships [Member] | Freightliner [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	£ 57,000	$ 84,907
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	18 years	18 years
Trademarks and Trade Names [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	40 years	40 years
Trademarks and Trade Names [Member] | Freightliner [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	£ 9,200	$ 13,704
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	40 years	40 years
Off-Market Favorable Lease [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years	5 years
Off-Market Favorable Lease [Member] | Freightliner [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	£ 2,033	$ 3,029
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years	5 years