Acquisitions and Dispositions (Details textuals) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Acquisitions and Dispositions (Textual) [Abstract]
Number of franchises disposed	10
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 61,200
Cash received in acquisition	3,900
Proceeds From Disposition Of Franchise Property And Equipment	36,843	$ 41,581	$ 144,597
Payments to Acquire Businesses, Net of Cash Acquired	57,327	212,252	$ 336,551
Net Gain (Loss) on Real Estate and Dealership Transactions	$ 2,200	$ 8,200
Brazil
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired	1
Number of franchises disposed	4	2
Number of franchises awarded	2
Number of franchises acquired	1
Number Of Dealerships Opened	2
Net Gain (Loss) on Real Estate and Dealership Transactions	$ (800)
U.S.
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired		3
Number of dealerships disposed		2
Number of franchises disposed	5	1
Net Gain (Loss) on Real Estate and Dealership Transactions	$ 2,700	$ 9,400
U.K.
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired	12
Number of franchises disposed	1
Number of franchises awarded	2
Number of franchises acquired	15
Number Of Dealerships Opened	2
Net Gain (Loss) on Real Estate and Dealership Transactions	$ (300)