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Intangible Franchise Rights and Goodwill (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | $ 16,797,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |  |  |
Intangible Franchise Rights, Beginning Balance |  |  |  | 284,876,000 |  |
Currency Translation |  |  |  | 1,973,000 |  |
Intangible Franchise Rights, Ending Balance |  | $ 294,120,000 |  | 294,120,000 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | 9,526,000 |  |
Asset Impairment Charges |  | 9,526,000 | $ 10,855,000 | 9,526,000 | $ 12,812,000 |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  | 876,763,000 |  |
Goodwill, Acquired During Period |  |  |  | 33,003,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | (933,000) |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | 5,409,000 |  |
Goodwill, Ending Balance | [1] | 914,224,000 |  | 914,224,000 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  | $ 97,800,000
Goodwill, Subsequent Recognition of Deferred Tax Asset |  |  |  | 18,000 |  |
BRAZIL |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | 0 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |  |  |
Intangible Franchise Rights, Beginning Balance |  |  |  | 7,005,000 |  |
Currency Translation |  |  |  | 202,000 |  |
Intangible Franchise Rights, Ending Balance |  | 7,207,000 |  | 7,207,000 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | 0 |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Beginning Balance | [1] |  |  | 13,774,000 |  |
Goodwill, Acquired During Period |  |  |  | 95,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | (933,000) |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | 401,000 |  |
Goodwill, Ending Balance | [1] | 13,337,000 |  | 13,337,000 |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset |  |  |  | 0 |  |
UNITED KINGDOM |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | 8,762,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |  |  |
Intangible Franchise Rights, Beginning Balance |  |  |  | 17,337,000 |  |
Currency Translation |  |  |  | 1,771,000 |  |
Intangible Franchise Rights, Ending Balance |  | 27,870,000 |  | 27,870,000 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | 0 |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Beginning Balance | [1] |  |  | 57,054,000 |  |
Goodwill, Acquired During Period |  |  |  | 3,737,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | 0 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | 5,008,000 |  |
Goodwill, Ending Balance | [1] | 65,799,000 |  | 65,799,000 |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset |  |  |  | 0 |  |
UNITED STATES |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | 8,035,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |  |  |
Intangible Franchise Rights, Beginning Balance |  |  |  | 260,534,000 |  |
Currency Translation |  |  |  | 0 |  |
Intangible Franchise Rights, Ending Balance |  | 259,043,000 |  | $ 259,043,000 |  |
Number of Dealerships Impaired |  |  |  | 1 |  |
Asset Impairment Charges |  |  |  | $ 9,526,000 |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, Beginning Balance | [1] |  |  | 805,935,000 |  |
Goodwill, Acquired During Period |  |  |  | 29,171,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | 0 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | 0 |  |
Goodwill, Ending Balance | [1] | $ 835,088,000 |  | 835,088,000 |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset |  |  |  | $ 18,000 |  |
[1] | 1) Net of accumulated impairment of $97.8 million.The Company evaluates intangible franchise rights and goodwill assets for impairment annually or more frequently if events or circumstances indicate possible impairment. During the three months ended September 30, 2017, the Company identified circumstances indicating possible impairment of some individual franchise rights, requiring a quantitative assessment. The Company did not identify any such circumstances relative to the goodwill for each of its reporting units. Based on the results of the Company's assessment, the Company determined that the fair value of the franchise rights on one of its U.S. dealerships was below its respective carrying value, resulting in franchise asset impairment charges of $9.5 million. This was recognized as an asset impairment in the Company's Consolidated Statements of Operations during the three months ended September 30, 2017.

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