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Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Income Tax Contingency [Line Items]      
Balance at beginning of year $ 7,698 $ 6,268 $ 5,784
Additions based on tax positions related to the current year 4,580 2,106 1,304
Reductions for tax positions of prior years (3,299) (676) (820)
Balance at end of year $ 8,979 $ 7,698 $ 6,268