Retirement Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Retirement Plans [Line Items]
Defined contribution plan maximum employee contribution as a percentage of base salary	75.00%
Expense from continuing operations for the Company-sponsored defined contribution plan	$ 1,718,000	$ 1,693,000	$ 1,660,000
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%