Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Assets Valued on Recurring Basis (Detail)

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Fair Value Measurements - Financial Assets Valued on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 28, 2013
Dec. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value $ 1,192 $ 1,140
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 1,192 1,140
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value      
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value      
Market Approach Valuation Technique [Member] | Cash and Cash Equivalents [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 1,099 1,030
Market Approach Valuation Technique [Member] | Investments - Mutual Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 93 110
Market Approach Valuation Technique [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 1,099 1,030
Market Approach Valuation Technique [Member] | Level 1 [Member] | Investments - Mutual Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 93 110
Market Approach Valuation Technique [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value      
Market Approach Valuation Technique [Member] | Level 2 [Member] | Investments - Mutual Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value      
Market Approach Valuation Technique [Member] | Level 3 [Member] | Cash and Cash Equivalents [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value      
Market Approach Valuation Technique [Member] | Level 3 [Member] | Investments - Mutual Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value