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Investments - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Investments [Line Items] |  |  |
Equity method investments | $ 40,000,000 | $ 35,211,000 |
Gains (losses) on equity method investments | 4,115,000 | 7,377,000 | $ 4,627,000
Gains (losses) relating to cost method investments |  |  | $ 0
Investments | 40,349,000 | 35,403,000 |
Consolidated VIE, total assets | 3,916,120,000 | 3,432,757,000 |
Consolidated VIE, total liabilities | 3,148,745,000 | 2,544,877,000 |
Maximum exposure to loss | 2,800,000 | 2,100,000 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Consolidated VIE, total assets | 7,400,000 | 4,900,000 |
Consolidated VIE, total liabilities | 2,100,000 | 600,000 |
Equity Investments [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments | 400,000 | 200,000 |
Unrealized gains to reflect observable transactions | 22,800,000 | 38,000,000.0 |
Gains (losses) on equity method investments | 0 | 0 |
Impairment charges, alternative measurements | $ 0 | $ 0 |

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