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)

v3.7.0.1
Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Detail)
$ in Thousands
3 Months Ended
Apr. 01, 2017
USD ($)
retirement_plan
Apr. 02, 2016
USD ($)
Compensation and Retirement Disclosure [Abstract]    
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan 2  
SERP    
Defined Benefit Plan Disclosure    
Service Cost $ 46 $ 44
Interest Cost 224 225
Amortization of Prior Service Cost 97 104
Amortization of Net Actuarial Losses 93 86
Net Periodic Cost 460 459
SERP Medical    
Defined Benefit Plan Disclosure    
Service Cost 2 1
Interest Cost 10 11
Amortization of Prior Service Cost 4 6
Amortization of Net Actuarial Losses 8 5
Net Periodic Cost $ 24 $ 23