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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]    
Document Period End Date Mar. 29, 2014  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 100,000 1,100,000
Net income $ 5,280 $ 8,355
Weighted-average shares outstanding 29,189,000 27,930,000
Dilutive effect of employee stock options and restricted shares 844,000 628,000
Diluted weighted-average shares outstanding 30,033,000 28,558,000
Basic income per share $ 0.18 $ 0.30
Diluted income per share $ 0.18 $ 0.29