Employee Benefit Plans - Schedule of Post-Retirement Benefits Obligation to Funded Status and Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accumulated benefit obligation at beginning of year	$ 2,909	$ 3,909
Service cost	16	20
Interest cost	120	208
Actuarial gain	(617)	(1,137)
Benefits paid	(62)	(91)
Accumulated benefit obligation at end of year	2,366	2,909
Plan assets at end of year
Funded status	$ (2,366)	$ (2,909)