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Acquisitions and Dispositions (Details textuals) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number of franchises disposed | 3 | 10 |
Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 120,300,000 | $ 0 |
Cash received in acquisition |  | 3,900,000 |
Proceeds From Disposition Of Franchise Property And Equipment | 10,708,000 | 36,843,000 | $ 41,581,000
Payments to Acquire Businesses, Net of Cash Acquired | $ 109,081,000 | 57,327,000 | $ 212,252,000
Net Gain (Loss) on Real Estate and Dealership Transactions |  | $ 2,200,000 |
Brazil |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired |  | 1 |
Number of franchises disposed | 2 | 4 |
Number of franchises awarded |  | 2 |
Number of franchises acquired |  | 1 |
Number Of Dealerships Opened |  | 2 |
Net Gain (Loss) on Real Estate and Dealership Transactions |  | $ (800,000) |
U.S. |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired | 3 |  |
Number of franchises disposed |  | 5 |
Number of franchises awarded | 1 |  |
Number of franchises acquired | 4 |  |
Number Of Dealerships Opened | 1 |  |
Net Gain (Loss) on Real Estate and Dealership Transactions |  | $ 2,700,000 |
U.K. |  |  |
Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Number Of Dealerships Acquired | 12 | 12 |
Number of franchises disposed | 1 | 1 |
Number of franchises awarded | 1 | 2 |
Number of franchises acquired | 14 | 15 |
Number Of Dealerships Opened | 1 | 2 |
Cash received in acquisition | $ 11,200,000 |  |
Net Gain (Loss) on Real Estate and Dealership Transactions |  | $ (300,000) |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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