Employee Retirement and Profit Sharing Plans - Reconciliation of Projected Benefit Obligation and Fair Value of Plans Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	$ 290,746	$ 270,123
Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	293,850	347,798
Service cost	3,081	3,692	3,068
Interest cost	13,979	12,496
Plan participants’ contributions	13	12
Plan amendments	(411)	0
Actuarial (gain) loss	57,716	(45,076)
Benefits paid	(22,462)	(25,072)
Benefit obligation at end of year	345,766	293,850	347,798
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	270,123	251,094
Actual return on plan assets	28,980	32,558
Employer contributions	14,338	11,531
Plan participants’ contributions	13	12
Benefits paid	(22,462)	(25,072)
Plan settlements	(1,466)	0
Fair value of plan assets at end of year	289,526	270,123	251,094
Funded status at end of year	$ (56,240)	$ (23,727)