Description of Business and Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	12 Months Ended
Dec. 31, 2017
Franchise Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated weighted average useful lives	25 years
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated weighted average useful lives	10 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Period Type:	duration