Financial Instruments Not Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note payable	$ 400	$ 458
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note payable	$ 400	$ 458