v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Sep. 24, 2017
Sep. 25, 2016
Income Tax [Line Items]        
Income tax expense (benefit) $ (487) $ 960 $ 252 $ 3,732
Income (loss) before income taxes $ (606) $ 2,809 $ 752 $ 10,141
Effective tax rate 80.40% 34.20% 33.50% 36.80%
ASU No. 2016-09 [Member]        
Income Tax [Line Items]        
Unfavorable impact to effective tax rate 7.50%   38.90%