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Stock-Based Compensation - Summary of Activity Under Plans and Agreement (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 25, 2016
Dec. 27, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options Outstanding shares, Beginning balance 4,368  
Options, Granted 369  
Options, Exercised (494)  
Options, Canceled (170)  
Options Outstanding shares, Ending balance 4,073 4,368
Options Outstanding shares, Exercisable 2,970  
Options outstanding weighted average exercise price $ 10.60 $ 10.53
Options, Weighted Average Exercise Price, Granted 13.65  
Options, Weighted Average Exercise Price, Exercised 10.98  
Options, Weighted Average Exercise Price, Canceled 14.40  
Options outstanding weighted average exercise price, Exercisable $ 9.52  
Options Outstanding Aggregate Intrinsic value $ 12,891 $ 9,742
Options Exercisable Aggregate Intrinsic Value $ 12,167  
Option Outstanding Weighted Average Remaining Term 5 years 5 years 1 month 6 days
Options Exercisable Weighted Average Remaining Term 3 years 8 months 27 days