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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at the beginning of the period $ 27,790 $ 26,108
Net reductions for lapse of statutes taken during the period (427) (173)
Net additions for tax positions taken during the current period 907 1,314
Balance at the end of the period $ 28,270 $ 27,249