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Marketable Securities - Investments Classified By Contractual Maturity Date (Detail) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Due in one year or less $ 213 $ 797,649
Due after one year through three years   201,826
Total $ 213 $ 999,475