Employee Retirement and Profit Sharing Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortizations:
Net periodic benefit cost	$ 6,805	$ 6,594	$ 4,729
Pension Plan
Components of net periodic benefit cost:
Service cost	3,173	3,631	3,081
Interest cost	12,171	13,736	13,979
Expected return on plan assets	(18,531)	(20,026)	(18,761)
Amortizations:
Prior service cost	857	856	787
Unrecognized net (gain) loss	8,822	8,544	5,105
Effect of settlement	313	0	538
Other	0	(147)	0
Net periodic benefit cost	$ 6,805	$ 6,594	$ 4,729