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Retirement Plan - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Compensation and Retirement Disclosure [Abstract]    
Period during which company is required to purchase shares at fair value after distribution of shares from ESOP 15 months  
Distributed shares subject to put option, fair value $ 81,691 $ 42,568
ESOP, shares cost 2,504,420 2,280,335
Common stock related to ESOP 2,586,111 2,322,903
ESOP shares, fair value $ 7,264,179 $ 7,139,235