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Investments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investments | $ 33,200 |  | $ 33,200 |  | $ 37,700
Gains (losses) on equity method investments | 1,323 | $ 1,119 | 2,789 | $ 2,142 |
Impairment charge on equity method investments | 0 | 0 | 0 | 2,500 |
Equity method investment, amount sold | 3,800 | 0 | 3,800 | 0 |
Equity investments carried under measurement alternative | 200 |  | 200 |  | 400
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 | 5,133,479 |  | 5,133,479 |  | 3,949,300
Consolidated VIE, total liabilities | 4,324,552 |  | 4,324,552 |  | 3,120,397
Maximum exposure to loss | 4,800 |  | 4,800 |  | 4,800
Other Nonoperating Income (Expense) |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity investments carried under measurement alternative, loss | 87 | $ 6 | 87 | $ 46 |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investments | 2,600 |  | 2,600 |  |
Equity investments carried under measurement alternative | 200 |  | 200 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Consolidated VIE, total assets | 8,200 |  | 8,200 |  | 7,200
Consolidated VIE, total liabilities | $ 1,800 |  | $ 1,800 |  | $ 1,000

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