Financial Assets and Liabilities that are Measured At Fair Value and are Categorized Using Fair Value Hierarchy (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	$ 25,951	$ 25,281
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	1,909	2,853
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	10,059	8,609
Fair Value, Inputs, Level 1 | Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	24,889	24,346
Fair Value, Inputs, Level 1 | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 1 | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 2 | Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	1,062	935
Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	1,909	2,853
Fair Value, Inputs, Level 2 | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities		0
Fair Value, Inputs, Level 3 | Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	0	0
Fair Value, Inputs, Level 3 | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 3 | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	$ 10,059	$ 8,609