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Losses and Loss Adjustment Reserve - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) Reinsurer | Dec. 31, 2014 USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Premiums written net | $ 468,750,000 |
Ceded unpaid loss | 37,200,000 |
The reinsurance recoverable | 367,000,000 |
Prepaid reinsurance premiums | 329,777,000 | $ 320,586,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve | 0 |
Reserve for losses and loss adjustment expense | $ 37,200,000 |
Number of reinsurers | Reinsurer | 3 |
Homeowners |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | $ 8,698 |
Reinsurance recoverable, incurred but not reported claims | 102 |
Private Passenger Auto Liability |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | 48,254 |
Reinsurance recoverable, incurred but not reported claims | 39,424 |
Other Liability |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | $ 756 |
Wright Flood |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Expenses and allowance rate received in premiums | 30.80% |
Premiums written net | $ 467,800,000 |
Wright Flood | Quota Share Agreement |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Effective cedes rate under quota share agreement | 100.00% |
Commission rate, percent of ceded written premiums | 30.50% |
Wright Flood | Quota Share Agreement | Ceded Credit Risk, Concentrated Credit Risk |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded amount | $ 900,000 |

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- Definition Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability + References No definition available. + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 + Details
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- Definition The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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