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Fair Value Measurement of Assets and Liabilities on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Assets:    
Cash Equivalents $ 74,534 $ 41,907
Fair Value, Inputs, Level 1
   
Assets:    
Cash Equivalents 74,534 41,907
Fair Value, Inputs, Level 2
   
Assets:    
Cash Equivalents      
Fair Value, Inputs, Level 3
   
Assets:    
Cash Equivalents