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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Non-Marketable Equity Securities | $ 379,548 | $ 217,104
Equity Method Investments | 69,373 | 68,781
Other assets | $ 360,373 | 352,018
Reclassification [Member] |  |
Non-Marketable Equity Securities |  | 222,100
Equity Method Investments |  | 63,800
Reclassification [Member] | Other Assets [Member] |  |
Other assets |  | $ 64,100

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