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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments | $ 37,659,000 |  |  |  | $ 40,000,000 |  |  |  | $ 37,659,000 | $ 40,000,000 |
Gains (losses) on equity method investments | 1,354,000 | $ 1,527,000 | $ 1,119,000 | $ 1,023,000 | 1,064,000 | $ 1,530,000 | $ 738,000 | $ 783,000 | 5,023,000 | 4,115,000 | $ 7,377,000
Impairment charge on equity method investments |  |  |  |  |  |  |  |  | 3,900,000 | 0 | $ 0
Investments | 38,008,000 |  |  |  | 40,349,000 |  |  |  | 38,008,000 | 40,349,000 |
Consolidated VIE, total assets | 3,949,300,000 |  |  |  | 3,926,914,000 |  |  |  | 3,949,300,000 | 3,926,914,000 |
Consolidated VIE, total liabilities | 3,120,397,000 |  |  |  | 3,178,308,000 |  |  |  | 3,120,397,000 | 3,178,308,000 |
Maximum exposure to loss | 4,800,000 |  |  |  | 2,800,000 |  |  |  | 4,800,000 | 2,800,000 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated VIE, total assets | 7,200,000 |  |  |  | 7,400,000 |  |  |  | 7,200,000 | 7,400,000 |
Consolidated VIE, total liabilities | 1,000,000.0 |  |  |  | 2,100,000 |  |  |  | 1,000,000.0 | 2,100,000 |
Equity Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments | $ 400,000 |  |  |  | $ 400,000 |  |  |  | 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 |  |  |  |  |  |  |  |  | $ (400,000) | $ 18,200,000 |

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