Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits - Summarizes the Components of Net Periodic Cost (Detail)

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Supplemental Retirement Plan and Related Post Retirement Benefits - Summarizes the Components of Net Periodic Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
SERP [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 62 $ 74
Interest cost 188 155
Amortization of prior service cost 130 124
Amortization of net actuarial losses 27 32
Net periodic cost 407 385
SERP Medical [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 8 6
Amortization of prior service cost 6 6
Net periodic cost $ 15 $ 13