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Carrying Amounts and Fair Values of Certain Assets (Detail) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount $ 11,877 $ 7,933
Restricted cash equivalents, carrying amount 112,272 96,375
Investments in marketable securities, carrying amount 8,718 8,119
Advertising fund cash equivalents, restricted, carrying amount 31,547 19,945
Advertising fund investments, restricted, carrying amount 50,152 74,007
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 11,877 7,933
Restricted cash equivalents, carrying amount 112,272 96,375
Investments in marketable securities, carrying amount 8,718 8,119
Advertising fund cash equivalents, restricted, fair value 31,547 19,945
Advertising fund investments, restricted, fair value $ 50,152 $ 74,007