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Carrying Amounts and Fair Values of Certain Assets (Detail) - USD ($)
$ in Thousands
Sep. 06, 2015
Dec. 28, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount $ 17,370 $ 16,290
Restricted cash equivalents, carrying amount 57,855 93,121
Investments in marketable securities, carrying amount 5,656 4,586
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 17,370 16,290
Restricted cash equivalents, fair value 57,855 93,121
Investments in marketable securities, carrying amount $ 5,656 $ 4,586