Derivative Financial Instruments Foreign Currency Exchange Rate Risk (Details) £ in Thousands, $ in Thousands, AUD in Millions					3 Months Ended		12 Months Ended
	Feb. 25, 2015 GBP (£)	Feb. 25, 2015 USD ($)	May. 23, 2014 AUD	May. 23, 2014 USD ($)	Mar. 31, 2015 GBP (£)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Mar. 23, 2015 USD ($)	Feb. 25, 2015 AUD	Feb. 25, 2015 GBP (£)	Feb. 25, 2015 USD ($)	Dec. 03, 2012 AUD	Dec. 03, 2012 USD ($)
Derivatives [Line Items]
Third party debt related to foreign operations denominated in foreign currencies											$ 512,100
Cash received on settlement of forward currency forward purchase contracts												$ 391,800
Loss on settlement of foreign currency forward purchase contracts							$ 18,686	$ 0	$ 0
Intercompany Loan, Amount										£ 120,000	181,000
Derivative instruments not designated as hedges amount recognized in earnings							(18,686)	(1,270)	(2,269)
Foreign currency forward purchase contract 1 [Member]
Derivatives [Line Items]
Notional Amount														£ 307,100	$ 475,000
Foreign currency forward purchase contract 2 [Member]
Derivatives [Line Items]
Notional Amount													AUD 163.8	£ 84,700
Cross-currency swap agreement [Member]
Derivatives [Line Items]
Notional Amount																AUD 105.0	$ 109,600
Payments for Derivative Instrument | AUD			AUD 105.0
Proceeds from Derivative Instrument				$ 108,900
Freightliner [Member]
Derivatives [Line Items]
Loss on settlement of foreign currency forward purchase contracts							18,700
Cash consideration					£ 492,083	$ 733,006
Scenario, Plan [Member] | Freightliner [Member]
Derivatives [Line Items]
Estimated Payments to Acquire Businesses, Gross	£ 490,000	$ 755,000
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] | Cross-currency swap agreement [Member]
Derivatives [Line Items]
Derivative instruments not designated as hedges amount recognized in earnings							0	(1,184)	(2,696)
Other (expense)/income, net | Not Designated as Hedging Instrument [Member] | Cross-currency swap agreement [Member]
Derivatives [Line Items]
Derivative instruments not designated as hedges amount recognized in earnings							$ 0	$ (86)	$ 427
Accrued interest [Member] | British Pound Foreign Currency Forward Contract 3-5 [Member]
Derivatives [Line Items]
Derivative, Amount of Hedged Item										£ 5,800	$ 8,500