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Investments - Additional Information (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Securities
Sep. 30, 2018
Securities
Debt Securities, Available-for-sale [Line Items]      
Document Period End Date Jun. 30, 2019    
Available-for-sale Securities $ 27,771 $ 22,137  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 2,875 $ 4,743  
Number of securities in unrealized loss position | Securities   20 6
Proceeds from sale of investment in fixed maturity securities 1,900    
Proceeds from Sale of Other Investments $ 4,500    
Investment security maturity date, start Jan. 01, 2019    
Investment security maturity date, End Jun. 30, 2019    
Gross realized gains and losses of securities insignificant    
Investments on deposit with the state insurance department $ 4,100    
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities 23,401 $ 21,514  
Corporate Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities $ 4,370 $ 623