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Losses and Loss Adjustment Reserve - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) Reinsurer | Dec. 31, 2018 USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Document Period End Date | Mar. 31, 2019 |
Premiums written net | $ 133,317 |
Ceded unpaid loss | 51,400 |
Prepaid reinsurance premiums | 314,363 | $ 337,920
Reserve for losses and loss adjustment expense | $ 51,400 |
Number of reinsurers | Reinsurer | 2 |
Wright National Flood Insurance Company [Member] |  |
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 | 30.00% |
Premiums written net | $ 132,900 |
Wright National Flood Insurance Company [Member] | 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% |
Ceded amount | $ 400 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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