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Carrying Amounts and Fair Values of Certain Assets (Detail) - USD ($)
$ in Thousands
Jun. 18, 2017
Jan. 01, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount $ 34,153 $ 7,017
Restricted cash equivalents, carrying amount 69,139 69,113
Investments in marketable securities, carrying amount 6,943 7,260
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, fair value 34,153 7,017
Restricted cash equivalents, fair value 69,139 69,113
Investments in marketable securities, carrying amount $ 6,943 $ 7,260