Schedule of Assets and Liabilities Measured at Fair Value (Detail) (Fair Value, Inputs, Level 2, USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011	Sep. 24, 2011
Commodity Contracts - Fuel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Category, Assets	$ 79		$ 725
Fair Value Measurement Category, Liabilities		251
Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Category, Assets	67	341	952
Fair Value Measurement Category, Liabilities	$ 430	$ 92	$ 38