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Cash and Investments in Marketable Securities - Cash and Investments in Marketable Securities, Including Cash Equivalents (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents $ 55,843 $ 96,363
Short-term investments 900,163 1,228,499
Long-term investments 197,715 279,119
Total cash and investments in marketable securities $ 1,153,721 $ 1,603,981