Retirement Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Retirement Plans [Line Items]
Defined contribution plan maximum employee contribution as a percentage of base salary	75.00%
Expense for the Company-sponsored defined contribution plan	$ 2,056	$ 2,074	$ 1,901
First 3% of Contributions on Defined Contribution Plan
Retirement Plans [Line Items]
Defined contribution plan employer contribution as a percentage of base salary	100.00%
Threshold to determine company matching percentage	3.00%
Next 2% of Contributions on Defined Contribution Plan
Retirement Plans [Line Items]
Defined contribution plan employer contribution as a percentage of base salary	50.00%
Threshold to determine company matching percentage	2.00%