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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill | $ 510,160 | $ 525,780
Net of accumulated impairment losses | 797,600 | 797,600
Lease agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite life intangibles | 4,200 | 4,700
Franchise assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Franchise assets | $ 67,800 | $ 69,900

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