Quarterly report pursuant to Section 13 or 15(d)

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

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Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 04, 2015
USD ($)
Jun. 28, 2014
USD ($)
Jul. 04, 2015
USD ($)
RetirementPlans
Jun. 28, 2014
USD ($)
Compensation and Retirement Disclosure [Abstract]        
Number of non-qualified supplemental retirement defined benefit plans | RetirementPlans     2  
SERP        
Defined Benefit Plan Disclosure        
Service Cost $ 48 $ 62 $ 97 $ 124
Interest Cost 211 188 422 376
Amortization of Prior Service Cost 124 130 247 260
Amortization of Net Actuarial Losses 112 27 225 54
Net Periodic Cost 495 407 991 814
SERP Medical        
Defined Benefit Plan Disclosure        
Service Cost 2 1 3 1
Interest Cost 10 8 19 16
Amortization of Prior Service Cost 6 6 13 12
Amortization of Net Actuarial Losses 7 0 12 0
Net Periodic Cost $ 25 $ 15 $ 47 $ 29