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. 27, 2014	Dec. 28, 2013
Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	$ 28,857	$ 28,496
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	578	1,471
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	17,243	10,063
Fair Value, Inputs, Level 1 | Pension Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets	27,972	27,875
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	885	621
Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	578	1,471
Fair Value, Inputs, Level 2 | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	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	$ 17,243	$ 10,063