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Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Feb. 25, 2015 | Feb. 10, 2014 | May 22, 2012
Significant Accounting Policies [Line Items] |  |  |  |  |
Plan Effective Date | Mar. 19, 2012 |  |  |  |
Unearned premiums | $ 270,000 | $ 761,000 |  |  |
Premium deficiency reserves | 300,000 | 800,000 |  |  |
Other liabilities | 14,063,000 | 14,357,000 |  |  |
Accrued professional fees | 1,100,000 |  |  |  |
Comprehensive income (loss) | 0 |  |  |  |
Amount of dividends paid on or after Effective Date | 0 |  |  |  |
Preferred stock dividends | 18,000,000 | 17,748,000 |  |  |
Preferred stock dividends paid | 18,000,000 | 16,998,000 |  |  |
2012 Plan [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Common stock reserved for future issuance |  |  | 12.0 | 3.0 | 2.0
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accrued fees | 12,300,000 |  |  |  |
Accrued dividends | 700,000 |  |  |  |
Preferred stock dividends | 18,000,000 | 17,000,000 |  |  |
Additional accrued preferred stock dividends | 700,000 | 700,000 |  |  |
Preferred stock dividends paid | $ 18,000,000 | $ 17,000,000 |  |  |
Preferred stock dividend rate | 3.00% | 3.00% |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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