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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule Of Investments [Line Items] |  |  |  |  |
Equity method investments | $ 38,400,000 |  | $ 38,400,000 |  | $ 40,000,000.0
Gains (losses) on equity method investments | 1,119,000 | $ 738,000 | 2,142,000 | $ 1,521,000 |
Impairment charge on equity method investments | 0 | 0 | 2,500,000 | 0 |
Investments | 38,751,000 |  | 38,751,000 |  | 40,349,000
Consolidated VIE, total assets | 4,502,354,000 |  | 4,502,354,000 |  | 3,916,120,000
Consolidated VIE, total liabilities | 3,716,333,000 |  | 3,716,333,000 |  | 3,148,745,000
Maximum exposure to loss | 1,100,000 |  | 1,100,000 |  | 2,800,000
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Consolidated VIE, total assets | 6,700,000 |  | 6,700,000 |  | 7,400,000
Consolidated VIE, total liabilities | 2,600,000 |  | 2,600,000 |  | 2,100,000
Equity Investments [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investments | 400,000 |  | 400,000 |  | $ 400,000
Gains (losses) on equity method investments | 0 | 0 | 0 | 0 |
Impairment charges, alternative measurements | 0 | 0 | 0 | 0 |
Unrealized gains (losses) to reflect observable transactions | $ (5,900) | $ 20,400,000 | $ (46,200) | $ 20,600,000 |

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