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 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 74 $ 88 $ 148 $ 128
Interest cost 155 147 310 252
Amortization of prior service cost 124 122 248 181
Amortization of net actuarial losses 32 23 64 46
Net periodic cost 385 380 770 607
SERP [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1    2 1
Interest cost 6 6 12 12
Amortization of prior service cost 6 7 12 13
Net periodic cost $ 13 $ 13 $ 26 $ 26