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Investments - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Document Period End Date Jun. 30, 2019    
Financial Instruments, Owned and Pledged as Collateral, at Fair Value $ 22.5    
Fixed maturities fair value of deposit with insurance regulators 9.2   $ 8.9
Proceeds on sale of available-for-sale securities 219.6 $ 143.4  
Federal Home Loan Bank of Cincinnati [Member]      
Debt Securities, Available-for-sale [Line Items]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 106.5