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)

v3.5.0.2
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. 01, 2016
USD ($)
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
retirement_plan
Oct. 03, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]        
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan     2  
SERP        
Defined Benefit Plan Disclosure        
Service cost $ 43 $ 49 $ 130 $ 145
Interest cost 225 211 675 633
Amortization of prior service cost 103 123 310 371
Amortization of net actuarial losses 86 113 257 336
Net periodic cost 457 496 1,372 1,485
SERP Medical        
Defined Benefit Plan Disclosure        
Service cost 1 1 4 3
Interest cost 10 10 30 30
Amortization of prior service cost 7 7 19 19
Amortization of net actuarial losses 4 6 16 20
Net periodic cost $ 22 $ 24 $ 69 $ 72