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Goodwill And Other Intangible Assets (Additional Information) (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Segment
Oct. 01, 2011
Dec. 31, 2011
Jul. 13, 2012
Sep. 30, 2012
Minimum [Member]
May 31, 2012
Minimum [Member]
Sep. 29, 2012
Maximum [Member]
May 31, 2012
Maximum [Member]
Goodwill And Intangible Assets [Line Items]                    
Acquired intangible assets           $ 29,560,000        
Estimated useful life of Intangible Assets             5 years   9 years  
Intangible asset commitments accrued     3,000,000 200,000 3,000,000          
Fair value exceeding the carrying value               8.00%   31.00%
Number of reporting units     2              
Goodwill impairment charge $ 9,114,000 $ 0 $ 9,114,000 $ 0