Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014		Sep. 27, 2014
Compensation and Retirement Disclosure [Abstract]
Amortization of actuarial loss - total before tax	$ (106)	[1]	$ (316)	[1]
Tax benefit	40		124
Net of tax	$ (66)		$ (192)

[1] The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.