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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 525,142 | $ 525,780
Net of accumulated impairment losses | 797,600 |
Lease agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite life intangibles | 4,500 | $ 4,700
Franchise assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Franchise assets | $ 69,900 |

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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