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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