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Reinsurance - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | May 31, 2015 | Dec. 31, 2015
Effects of Reinsurance [Line Items] |  |  |
Reinsurance unsecured amounts due from reinsurers | $ 0 |  | $ 60,828,000
Stockholders' Equity, Total [Member] | Amounts Due From Reinsurers [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity | 3.00% |  |
Reinsurance Program Effective June One Two Thousand Fourteen [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of premium ceded |  | 30.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the percentage of premiums ceded to reinsurers, in order to reduce the company's risk of loss. + References No definition available. + Details
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- Definition Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date. + References No definition available. + Details
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