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Investments - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Securities | Dec. 31, 2017 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | $ 30,315 | $ 30,848
Number of securities in unrealized loss position | Securities | 31 | 27
Proceeds from sale of investment in fixed maturity securities | $ 6,000 |
Proceeds from Sale of Other Investments | $ 6,500 |
Investment security maturity date, start | Jan. 01, 2018 |
Investment security maturity date, End | Mar. 31, 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 | $ 29,242 | $ 29,764

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- Definition The latest maturity date when short-term debt instruments are reported on the Schedule of Investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Footnote 2 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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