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Additional Balance Sheet and Cash Flow Information (Marketable Securities) (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Debt securities | $ 10,003 | $ 10,007 | $ 0
Mutual funds | 49,896 | 44,243 | 49,402
Debt Securities, Available-for-sale | $ 59,899 | $ 54,250 | $ 49,402

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