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Equity Securities (Summary of Investments in Non-Marketable Equity Securities) (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Carrying amount | $ 379,548 | $ 217,104
Non Marketable Equity Securities |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Cost | 198,155 | 200,858
Unrealized gains | 181,393 | 16,246
Carrying amount | $ 379,548 | $ 217,104

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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