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Income Taxes - Unrecognized Tax Benefits Roll Forward (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 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 positions 19,097 (2,953)
Balance at the end of the period $ 24,940 $ 7,011