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 9 Months Ended
Oct. 03, 2015
USD ($)
Sep. 27, 2014
USD ($)
Oct. 03, 2015
USD ($)
RetirementPlans
Sep. 27, 2014
USD ($)
Compensation and Retirement Disclosure [Abstract]        
Number of non-qualified supplemental retirement defined benefit plans | RetirementPlans     2  
SERP        
Defined Benefit Plan Disclosure        
Service cost $ 49 $ 62 $ 145 $ 187
Interest cost 211 188 633 565
Amortization of prior service cost 123 130 371 390
Amortization of net actuarial losses 113 27 336 80
Net periodic cost 496 407 1,485 1,222
SERP Medical        
Defined Benefit Plan Disclosure        
Service cost 1 1 3 3
Interest cost 10 8 30 24
Amortization of prior service cost 7 6 19 18
Amortization of net actuarial losses 6 0 20 0
Net periodic cost $ 24 $ 15 $ 72 $ 45