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Restaurant Information by Ownership Type (Detail) - Restaurant	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Number of Restaurants	37,241	36,899	36,525
Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	34,108	31,230	30,081
Company-operated restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	3,133	5,669	6,444
Conventional franchised | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	21,366	21,559	21,147
Developmental licensed | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	6,945	6,300	5,529
Affiliated | Franchised restaurants:
Segment Reporting Information [Line Items]
Number of Restaurants	5,797	3,371	3,405

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- Definition

Represents the number of restaurants.

+ References

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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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- Details

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- Details

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- Details

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- Details

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