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Investments - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |
Realized (loss) gain on trading securities | $ 800,000 | $ 1,800,000 | $ (1,500,000)
Distributions from equity method investments | 828,000 | $ 4,178,000 | $ 911,000
Debt Securities, Available-for-sale, Amortized Cost | 0 |  |
Capital commitments |  |  |
Investment [Line Items] |  |  |
Future capital commitment (up to) | $ 500,000 |  |

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