Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Effective tax rate 3.00% (0.60%) (906.00%) 2.70%  
Valuation allowance         $ 46,775
Reduction of valuation allowance $ 27,248   $ 27,248