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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 |

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