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Income Taxes - Unrecognized Tax Benefits Roll Forward (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at the beginning of the period $ 5,843 $ 9,964
Net changes in uncertain tax benefits 217 (1,870)
Balance at the end of the period $ 6,060 $ 8,094