Employee Retirement and Profit Sharing Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Minimum requisite service period, years	one or more years of service
Unrecognized prior service costs, before tax	$ 3,800,000	$ 3,500,000
Unrecognized prior service costs, net of tax	2,300,000	2,100,000
Unrecognized actuarial losses, before tax	128,700,000	86,800,000
Unrecognized actuarial losses, net of tax	79,300,000	53,100,000
Prior service costs expected to be recognized next fiscal year	900,000
Prior service costs expected to be recognized next fiscal year, net of tax	600,000
Actuarial losses expected to be recognized next fiscal year	8,500,000
Actuarial losses expected to be recognized next fiscal year, net of tax	5,200,000
Current accrued pension liability	800,000
Employer expected contribution in 2014	2,600,000
Frozen defined benefit plan obligations	90.00%
Accumulated benefit obligation for all defined benefit plans	341,300,000	290,600,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Plan participants' contributions, allowed percentage of participants' annual compensation	1.00%
Plans in green zone	80.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Plan participants' contributions, allowed percentage of participants' annual compensation	20.00%
Plans in red zone	65.00%
Plans in yellow zone	80.00%
De-risking strategy in 2014 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Targets investment in equity securities, fixed income, cash equivalents and other investments, percentage	50.00%
De-risking strategy in 2014 | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Targets investment in equity securities, fixed income, cash equivalents and other investments, percentage	49.00%
De-risking strategy in 2014 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Targets investment in equity securities, fixed income, cash equivalents and other investments, percentage	1.00%
De-risking strategy in 2014 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Targets investment in equity securities, fixed income, cash equivalents and other investments, percentage	1.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Funded status at end of year	(56,240,000)	(23,727,000)
Employer expected contribution in 2014	$ 5,400,000
Weighted average discount rate	4.08%	4.90%