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Income Taxes - Summary of Total Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Income Tax Disclosure [Abstract]      
Current, Federal $ 3,231 $ 9,635 $ 7,478
Current, State 836 1,712 1,558
Current, Total 4,067 11,347 9,036
Deferred, Federal 8,092 (652) 378
Deferred, State 1,435 355 37
Deferred, Total 9,527 (297) 415
Total, Federal 11,323 8,983 7,856
Total, State 2,271 2,067 1,595
Total income tax expense (benefit) $ 13,594 $ 11,050 $ 9,451