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Equity Securities (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule Of Investments [Line Items] |  |  |  |  |
Realized and unrealized net gains (losses) on equity securities | $ (16,100) | $ 26,000 | $ 27,200 | $ 2,600 |
Net unrealized gains (losses) on equity securities | (16,700) | 26,100 | 25,500 | 2,400 |
Investments in non marketable equity securities | 379,548 |  | 379,548 |  | $ 217,104
Offerpad Inc |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Net unrealized gains (losses) on equity securities | 195,300 |  | 195,300 |  |
Investments in non marketable equity securities | 280,300 |  | 280,300 |  | 280,300
Non Marketable Equity Securities |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investments in non marketable equity securities | 379,548 |  | 379,548 |  | 217,104
Cost | 198,155 |  | 198,155 |  | $ 200,858
Net unrealized gains on equity securities | 79,400 | $ 9,300 | 165,100 | $ 9,300 |
Non Marketable Equity Securities | Side Inc |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investments in non marketable equity securities | 73,800 |  | 73,800 |  |
Cost | 10,100 |  | 10,100 |  |
Non Marketable Equity Securities | Orchard Technologies Inc |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investments in non marketable equity securities | 106,300 |  | 106,300 |  |
Cost | $ 41,000 |  | $ 41,000 |  |

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