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Other Assets (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments |  |  |  |
Investment grade corporate and municipal bond held to maturity | $ 130,900,000 | $ 130,900,000 |  |
Interest receivable | 684,000 | 684,000 |  |
Allowance for credit loss | $ 0 | 0 |  |
Proceeds from the sale of investment in preferred shares |  | 15,000,000 | $ 0 |
Purchase of equity investment common shares |  | 10,000,000 | $ 0 |
Record Holdings |  |  |  |
Schedule of Equity Method Investments |  |  |  |
Proceeds from the sale of investment in preferred shares |  | $ 15,000,000 |  |
Ownership percentage (percent) | 18.00% | 18.00% |  | 20.00%
Purchase of equity investment common shares |  | $ 10,000,000 |  |

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