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 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
SERP [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 62 $ 74 $ 187 $ 222
Interest cost 188 155 565 465
Amortization of prior service cost 130 121 390 370
Amortization of net actuarial losses 27 32 80 95
Net periodic cost 407 382 1,222 1,152
SERP Medical [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 3
Interest cost 8 6 24 18
Amortization of prior service cost 6 6 18 18
Net periodic cost $ 15 $ 13 $ 45 $ 39