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Detail of Certain Balance Sheet Accounts (Property and Equipment) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 dealerships | Sep. 30, 2014 dealerships | Sep. 30, 2013 dealerships | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from Divestiture of Businesses | $ 138,800,000 |  |  |
Gain (Loss) on Disposition of Business | 16,600,000 | 17,300,000 | 10,400,000 |
Property and Equipment |  |  |  |
Total | 1,056,048,000 | 1,056,048,000 |  | 974,086,000
Less accumulated depreciation and amortization | 196,709,000 | 196,709,000 |  | 177,730,000
Property and equipment, net | 859,339,000 | 859,339,000 |  | 796,356,000
Capital expenditures incurred for purchase and construction of assets |  | 59,700,000 |  |
Assets Held-for-sale, Long Lived | 8,100,000 | 8,100,000 |  |
Land [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 294,475,000 | 294,475,000 |  | 269,778,000
Acquisition of fixed assets |  | 23,800,000 |  |
Buildings [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 428,784,000 | 428,784,000 |  | 405,918,000
Buildings [Member] | Minimum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P30Y |  |  |
Buildings [Member] | Maximum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P40Y |  |  |
Leasehold improvements [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 128,887,000 | 128,887,000 |  | 120,531,000
Leasehold improvements [Member] | Minimum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | varies |  |  |
Machinery and equipment [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 85,420,000 | 85,420,000 |  | 79,209,000
Machinery and equipment [Member] | Minimum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P7Y |  |  |
Machinery and equipment [Member] | Maximum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P20Y |  |  |
Furniture and fixtures [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 76,162,000 | 76,162,000 |  | 70,918,000
Furniture and fixtures [Member] | Minimum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P3Y |  |  |
Furniture and fixtures [Member] | Maximum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P10Y |  |  |
Company vehicles [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 10,517,000 | 10,517,000 |  | 8,508,000
Company vehicles [Member] | Minimum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P3Y |  |  |
Company vehicles [Member] | Maximum [Member] |  |  |  |
Property and Equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | P5Y |  |  |
Construction in progress [Member] |  |  |  |
Property and Equipment |  |  |  |
Total | 31,803,000 | 31,803,000 |  | 19,224,000
Land and Building [Member] |  |  |  |
Property and Equipment |  |  |  |
Acquisition of fixed assets |  | 47,000,000 |  |
Significant Acquisitions and Disposals [member] |  |  |  |
Property and Equipment |  |  |  |
Capital expenditures incurred for purchase and construction of assets |  | 2,800,000 |  |
U.S. [Member] |  |  |  |
Property and Equipment |  |  |  |
Number of dealerships acquired |  | 7 |  | 9
Number of Franchises Acquired |  | 1 |  |
Number of Dealerships Disposed | 5 | 7 | 6 |
U.S. [Member] | Assets Held-for-sale [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from Divestiture of Businesses | 129,000,000 |  |  |
Gain (Loss) on Disposition of Business | $ 16,700,000 |  |  |
Property and Equipment |  |  |  |
Number of Dealerships Disposed | 3 |  |  |

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