Selected Quarterly Financial Data (Unaudited) (Details Textual) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS	$ 10,000	$ 9,500	$ 20,000	$ 10,900	$ 1,000	$ 900	$ 19,506	$ 32,838	$ 87,562
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 9,800	9,500	$ 19,200	$ 10,600		$ 200	$ 19,300	$ 30,000	30,100
Chargeback reserves for finance and insurance revenues		$ 14,700
Number of Franchises Disposed							3	10
Net Gain (Loss) on Real Estate and Dealership Transactions								$ 2,200
Asset impairment charge on disposition								600
U.S.
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS							$ 12,762	$ 21,794	18,983
Chargeback reserves for finance and insurance revenues							6,600
Number of Franchises Disposed								5
Net Gain (Loss) on Real Estate and Dealership Transactions								$ 2,700
U.S. | Pre-tax [Member]
Condensed Financial Statements, Captions [Line Items]
Net Gain (Loss) on Real Estate and Dealership Transactions								2,700	8,900
U.S. | Net of taxes [Member]
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS							8,000	13,500	12,000
Net Gain (Loss) on Real Estate and Dealership Transactions								1,700	5,500
U.K.
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS							$ 0	$ 201	330
Number of Franchises Disposed							1	1
Net Gain (Loss) on Real Estate and Dealership Transactions								$ (300)
Brazil
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS							$ 6,744	$ 10,843	68,249
Number of Franchises Disposed							2	4
Net Gain (Loss) on Real Estate and Dealership Transactions								$ (800)
Brazil | Pre-tax [Member]
Condensed Financial Statements, Captions [Line Items]
Net Gain (Loss) on Real Estate and Dealership Transactions								800
Brazil | Net of taxes [Member]
Condensed Financial Statements, Captions [Line Items]
ASSET IMPAIRMENTS							$ 4,400	$ 6,900	$ 62,400