Employee Retirement and Profit Sharing Plans - Fair Values by Category of Inputs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	$ 278,915	$ 290,746
Equity Securities, Common Stock
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	241	210
Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	105,874	135,726
Equity Securities Index Funds International Equities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	0	0
Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	6,204	8,101
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	112,319	144,037
Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	160,419	140,714
Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	3,929	2,921
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	164,348	143,635
Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	1,975	2,507
Total Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	1,975	2,507
Other Investments Partnerships Joint Ventures
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	273	567
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	273	567
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	241	210
Level 1 | Equity Securities, Common Stock
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	241	210
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	241	210
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	274,472	287,048
Level 2 | Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	105,874	135,726
Level 2 | Equity Securities Index Funds International Equities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	0	0
Level 2 | Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	6,204	8,101
Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	112,078	143,827
Level 2 | Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	160,419	140,714
Level 2 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	0	0
Level 2 | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	160,419	140,714
Level 2 | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	1,975	2,507
Level 2 | Total Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	1,975	2,507
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	4,202	3,488	$ 3,957
Level 3 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	3,929	2,921	3,093
Level 3 | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	3,929	2,921
Level 3 | Other Investments Partnerships Joint Ventures
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	273	567	$ 864
Level 3 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Total, Fair Value	$ 273	$ 567