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Losses and Loss Adjustment Reserve - Additional Information (Detail) | 6 Months Ended |
--- | --- | ---
Jun. 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 | $ 288,049,000 |
Ceded unpaid loss | 79,200,000 |
The reinsurance recoverable | 381,800,000 |
Prepaid reinsurance premiums | 302,578,000 | $ 320,586,000
Reserve for losses and loss adjustment expense | $ 0 |
Number of reinsurers | Reinsurer | 3 |
Homeowners |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | $ 11,198 |
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 | 51,764 |
Reinsurance recoverable, incurred but not reported claims | 39,424 |
Other Liability |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | $ 1,161 |
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 | $ 287,500,000 |
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 | $ 500,000 |

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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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