Pension and Other Postretirement Obligations - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,409	$ 1,784
Interest cost	2,394	2,540
Expected return on plan assets	(3,191)	(3,154)
Amortization of prior service credit	(9)	(11)
Actuarial losses	698	1,286
Net periodic benefit cost	1,301	2,445
Other Postretirement Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	16
Interest cost	368	403
Amortization of prior service credit	(11)	(25)
Actuarial losses	82	128
Net periodic benefit cost	$ 452	$ 522