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Investments - Additional Information (Detail) - USD ($) | 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] |  |  |  |  |
Equity method investments | $ 30,600,000 |  | $ 30,600,000 |  | $ 37,700,000
Gains (losses) on equity method investments | 1,816,000 | $ 1,527,000 | 4,605,000 | $ 3,669,000 |
Impairment charge on equity method investments | 0 | 200,000 | 0 | 2,700,000 |
Equity method investment, amount sold | 0 | 0 | 3,800,000 | 0 |
Equity investments carried under measurement alternative | 200,000 |  | 200,000 |  | 400,000
Equity investments carried under measurement alternative, impairment | 0 | 0 | 0 | 0 |
Equity investments carried under measurement alternative, loss | 0 | 0 | 0 | 0 |
Equity investments carried under measurement alternative, gain | 0 | 0 | 0 | 0 |
Consolidated VIE, total assets | 5,415,607,000 |  | 5,415,607,000 |  | 3,953,242,000
Consolidated VIE, total liabilities | 4,711,771,000 |  | 4,711,771,000 |  | 3,121,271,000
Maximum exposure to loss | 4,900,000 |  | 4,900,000 |  | 4,800,000
Other Nonoperating Income (Expense) |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity investments carried under measurement alternative, loss | 200,000 | $ 1,000,000 | 100,000 | $ 1,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investments | 2,600,000 |  | 2,600,000 |  |
Equity investments carried under measurement alternative | 200,000 |  | 200,000 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Consolidated VIE, total assets | 8,700,000 |  | 8,700,000 |  | 7,200,000
Consolidated VIE, total liabilities | $ 2,200,000 |  | $ 2,200,000 |  | $ 1,000,000

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