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Investments - Additional Information (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) Securities | Dec. 31, 2017 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Sep. 30, 2018 |
Available-for-sale Securities | $ 21,883 | $ 30,848
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | $ 4,732 | $ 16,899
Number of securities in unrealized loss position | Securities | 23 | 27
Proceeds from sale of investment in fixed maturity securities | $ 17,000 |
Proceeds from Sale of Other Investments | $ 17,600 |
Investment security maturity date, start | Jan. 01, 2018 |
Investment security maturity date, End | Sep. 30, 2018 |
Gross realized gains and losses of securities | insignificant |
Investments on deposit with the state insurance department | $ 4,000 |
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 21,263 | $ 29,764
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | $ 620 | $ 1,084

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