Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits - Net Periodic Pension Cost or Net Periodic Cost Recognized for Defined Benefit Plans (Detail)

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Supplemental Retirement Plan and Related Post Retirement Benefits - Net Periodic Pension Cost or Net Periodic Cost Recognized for Defined Benefit Plans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 74 $ 88 $ 222 $ 215
Interest cost 155 148 465 400
Amortization of prior service cost 121 122 370 304
Amortization of net actuarial losses 32 22 95 69
Net periodic cost 382 380 1,152 988
SERP [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 2
Interest cost 6 6 18 18
Amortization of prior service cost 6 6 18 19
Net periodic cost $ 13 $ 13 $ 39 $ 39