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 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
SERP [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 62 $ 74 $ 124 $ 148
Interest cost 188 155 376 310
Amortization of prior service cost 130 124 260 248
Amortization of net actuarial losses 27 32 54 64
Net periodic cost 407 385 814 770
SERP Medical [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 2
Interest cost 8 6 16 12
Amortization of prior service cost 6 6 12 12
Net periodic cost $ 15 $ 13 $ 29 $ 26