Long-Term Debt - Additional information (Detail) (USD $)	3 Months Ended				9 Months Ended
	Sep. 27, 2014	Mar. 29, 2014	Sep. 28, 2013	Mar. 30, 2013	Sep. 27, 2014	Sep. 28, 2013
Debt Disclosure [Abstract]
Principal pre-payment amount	$ 7,500,000	$ 7,500,000	$ 7,500,000	$ 7,500,000	$ 22,519,000	$ 22,518,000
Remaining borrowing capacity	58,500,000				58,500,000
Outstanding standby letters of credit	1,500,000				1,500,000
Covenant trigger, letter of credit amount drawn maximum	1,000,000.0				1,000,000.0
Covenant trigger, letter of credit, aggregate amount outstanding, maximum	5,000,000.0				5,000,000.0
Fair value debt	$ 215,000,000				$ 215,000,000