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Cash and Investments in Marketable Securities - Cash and Investments in Marketable Securities, Including Cash Equivalents (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Cash and cash equivalents | $ 58,206 | $ 96,363
Short-term investments | 980,191 | 1,228,499
Long-term investments | 172,166 | 279,119
Total cash and investments in marketable securities | $ 1,210,563 | $ 1,603,981

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