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Losses and Loss Adjustment Reserve - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Reinsurer | Dec. 31, 2016 USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Document Period End Date | Dec. 31, 2017 |
Premiums written net | $ 604,610,000 | $ 591,124,000
Reinsurance Recoverables on Unpaid Losses, Gross | 477,800,000 | 78,100,000
Prepaid reinsurance premiums | 321,017,000 | 308,661,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve | 1,100,000 |
Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability | $ 477,800,000 | 78,100,000
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% |
Percentage of reinsurance recoverables allowance | 30.90% |
Premiums written net | $ 602,900,000 | 589,500,000
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% |
Wright National Flood Insurance Company [Member] | Quota Share Agreement | Reinsurer Concentration Risk [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded amount | $ 1,700,000 | $ 1,600,000
Wright National Flood Insurance Company [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Loss Adjustment Expense | 16,606 |
Case Reserves | 838,307 |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | $ 1,500,000 |

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- Definition Loss Adjustment Expense + References No definition available. + Details
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- Definition Percentage of ceded premiums. + References No definition available. + Details
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- Definition Percentage of flood premiums ceded. + References No definition available. + Details
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- Definition Percentage of reinsurance recoverables allowance. + References No definition available. + Details
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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 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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- 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + 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=66902209&loc=d3e3602-108585 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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