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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule Of Investments [Line Items] |  |  |
Equity method investments | $ 39,600,000 |  | $ 37,700,000
Gains (losses) on equity method investments | 1,466,000 | $ 1,023,000 |
Impairment charge on equity method investments | 0 | 2,500,000 |
Investments | 40,004,000 |  | 38,008,000
Consolidated VIE, total assets | 5,570,665,000 |  | 3,949,300,000
Consolidated VIE, total liabilities | 4,680,254,000 |  | 3,120,397,000
Maximum exposure to loss | 4,500,000 |  | 4,800,000
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Consolidated VIE, total assets | 7,600,000 |  | 7,200,000
Consolidated VIE, total liabilities | 1,400,000 |  | 1,000,000.0
Equity Investments [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments | 400,000 |  | $ 400,000
Gains (losses) on equity method investments | 0 | 0 |
Impairment charges, alternative measurements | 0 | 0 |
Unrealized gains (losses) to reflect observable transactions | $ 0 | $ 40,000 |

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