Credit Facilities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Credit Facility (Textual) [Abstract]
Assets Held-for-sale, Long Lived	$ 21,000,000	$ 22,500,000
Floorplan Offset	(79,795,000)	(39,616,000)
Brazil Credit Facilities [Member] | Maximum [Member]
Credit Facility (Textual) [Abstract]
Debt interest rate	21.70%
Debt Instrument Maturity Date Period	12 months
Brazil Credit Facilities [Member] | Minimum [Member]
Credit Facility (Textual) [Abstract]
Debt interest rate	16.77%
Debt Instrument Maturity Date Period	1 month
FMCC Facility [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Maximum borrowing capacity under line of credit facility	300,000,000
Line of Credit Facility, Amount Outstanding	117,000,000
Available amount under borrowing capacity	183,000,000
Cancellation of agreement	0 years 0 months 30 days
Debt interest rate	4.75%
Revolving Credit Facility [Member]
Credit Facility (Textual) [Abstract]
Maximum borrowing capacity under line of credit facility	1,700,000,000
Number of financial institution	25
Number of Manufacturer-affiliated finance companies	6
Expiry date of Revolving Credit Facility	Jun. 20, 2018
Number of tranches	2
Line of credit facility, maximum borrowing capacity can be extended, amount	1,950,000,000
Acquisition Line Minimum Commitment	100,000,000
Line of credit facility, unamortized cost	4,900,000
Restricted payment	176,400,000
Maximum Limit Of Restricted Payment Basket	125,000,000
Revolving Credit Facility [Member] | Acquisition Line [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Line of Credit Facility, Amount Outstanding	123,739,000	69,713,000
Available amount under borrowing capacity	150,600,000
Letters of credit outstanding	45,700,000
Revolving Credit Facility [Member] | Acquisition Line [Member] | Maximum [Member]
Credit Facility (Textual) [Abstract]
Maximum borrowing capacity under line of credit facility	320,000,000
Commitment fees, Percentage	0.45%
Revolving Credit Facility [Member] | Acquisition Line [Member] | Minimum [Member]
Credit Facility (Textual) [Abstract]
Maximum borrowing capacity under line of credit facility	100,000,000
Commitment fees, Percentage	0.25%
Revolving Credit Facility [Member] | Acquisition Line [Member] | United States of America, Dollars
Credit Facility (Textual) [Abstract]
Line of Credit Facility, Amount Outstanding	123,700,000
Revolving Credit Facility [Member] | Acquisition Line [Member] | United States of America, Dollars | Maximum [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Revolving Credit Facility [Member] | Acquisition Line [Member] | United States of America, Dollars | Minimum [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Revolving Credit Facility [Member] | Acquisition Line [Member] | Euros or Pound Sterling [Member] | Maximum [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Maximum borrowing capacity under line of credit facility	125,000,000
Revolving Credit Facility [Member] | Acquisition Line [Member] | Euros or Pound Sterling [Member] | Minimum [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Revolving Credit Facility [Member] | Floorplan Line [Member]
Credit Facility (Textual) [Abstract]
Commitment fees, Percentage	0.20%
Line of Credit Facility, Amount Outstanding	1,054,100,000
Available amount under borrowing capacity	325,900,000
Floorplan Offset	(79,800,000)
Weighted average interest rate	1.40%
Maximum period for outstanding borrowing	1 year 0 months 0 days
Revolving Credit Facility [Member] | Floorplan Line [Member] | Maximum [Member]
Credit Facility (Textual) [Abstract]
Maximum borrowing capacity under line of credit facility	$ 1,600,000,000
Revolving Credit Facility [Member] | Floorplan Line [Member] | Used Vehicle [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Revolving Credit Facility [Member] | Floorplan Line [Member] | New Vehicle [Member]
Credit Facility (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Rental Vehicle Credit Facility [Member]
Credit Facility (Textual) [Abstract]
Debt interest rate	4.75%
UK Credit Facilities [Member] | Maximum [Member]
Credit Facility (Textual) [Abstract]
Debt interest rate	3.95%
UK Credit Facilities [Member] | Minimum [Member]
Credit Facility (Textual) [Abstract]
Debt interest rate	1.15%