Employee Retirement and Profit Sharing Plans - Reconciliation of Projected Benefit Obligation and Fair Value of Plans Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets:
Fair value of plan assets at beginning of year	$ 278,915
Fair value of plan assets at end of year	282,183	$ 278,915
Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of year	333,975	345,766
Service cost	3,173	3,631	$ 3,081
Interest cost	12,171	13,736
Plan participants’ contributions	0	10
Plan amendments	0	72
Actuarial (gain) loss	11,578	(10,351)
Benefits paid	(21,407)	(18,889)
Plan settlements	(757)	0
Benefit obligation at end of year	338,733	333,975	345,766
Change in plan assets:
Fair value of plan assets at beginning of year	282,753	289,526
Actual return on plan assets	16,105	(6,716)
Employer contributions	5,489	18,822
Plan participants’ contributions	0	10
Benefits paid	(21,407)	(18,889)
Plan settlements	(757)	0
Fair value of plan assets at end of year	282,183	282,753	$ 289,526
Funded status at end of year	$ (56,550)	$ (51,222)