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Summary of Significant Accounting Policies Restaurant Information by Ownership Type (Detail) - Restaurant	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Number of Restaurants	37,855	37,241	36,899
Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	35,085	34,108	31,230
Company-operated restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	2,770	3,133	5,669
Conventional franchised | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	21,685	21,366	21,559
Developmental licensed | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	7,225	6,945	6,300
Affiliated | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	6,175	5,797	3,371

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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- Details

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- Details

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X

- Details

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- Details

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