Derivative Financial Instruments - Summary of Pre-Tax Changes in Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 91	$ (10)	$ 871	$ (500)
Cost of Sales [Member] | Commodity Hedging Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 91	$ (10)	$ 871	$ (500)