Financial Instruments Not Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 26, 2015	Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note payable	$ 458	$ 513
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note payable	$ 458	$ 513