Schedule Of Financial Assets And Liabilities Subject To Fair Value Measurement Provisions (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	$ 41,059	$ 19,985
Total liabilities at fair value	(575)	(1,801)
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	39,561	15,275
Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value		3,555
Stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	181	170
Derivative Instruments - Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	1,317	985
Derivative Instruments - Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	(575)	(1,801)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	39,742	15,445
Level 1 | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	39,561	15,275
Level 1 | Stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	181	170
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	1,317	4,540
Total liabilities at fair value	(575)	(1,801)
Level 2 | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value		3,555
Level 2 | Derivative Instruments - Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value	1,317	985
Level 2 | Derivative Instruments - Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total liabilities at fair value	$ (575)	$ (1,801)