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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 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]        
Net income $ 14,607 $ 7,804 $ 28,417 $ 24,453
Weighted-average shares outstanding 29,595,000 28,733,000 29,439,000 28,359,000
Dilutive effect of employee stock options and restricted shares 588,000 849,000 730,000 848,000
Diluted weighted-average shares outstanding 30,183,000 29,582,000 30,169,000 29,207,000
Basic income per share $ 0.49 $ 0.27 $ 0.97 $ 0.86
Diluted income per share $ 0.48 $ 0.26 $ 0.94 $ 0.84
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 400,000 100,000 200,000 700,000