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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2016 | Mar. 29, 2013 | Apr. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | May 23, 2013 | Nov. 09, 2006
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Statutory capital and surplus |  |  |  | $ 14,300,000 |  |  |  |
Principal repayments of Surplus Note |  |  |  | 1,500,000 | $ 1,500,000 | $ 1,500,000 |  |
Surplus during the term of surplus note |  |  |  | 50,000,000 |  |  |  |
Issuance of common stock |  |  |  | 10,000,000 |  |  |  |
Amortization of discount |  |  |  | 149,000 | 521,000 | 840,000 |  |
Interest Expense |  |  |  | $ 400,000 | $ 1,000,000 | $ 1,500,000 |  |
Deutsche Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured line of credit, maximum borrowing capacity |  | $ 15,000,000 |  |  |  |  |  |
DB loan, maturity date |  | Jul. 31, 2017 |  |  |  |  |  |
DB loan, Interest rate |  |  |  | LIBOR plus a margin of 5.50% or Deutsche Bank’s prime rate plus a margin of 3.50% |  |  |  |
Basis spread on LIBOR rate |  | 5.50% |  |  |  |  |  |
Basis spread on Prime rate |  | 3.50% |  |  |  |  |  |
Unsecured line of credit, amount drawn |  |  |  | $ 0 |  |  |  |
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of common stock, shares issued | 583,771 |  |  |  |  |  |  |
Common stock, price per share | $ 17.13 |  | $ 17.13 |  |  |  |  |
Issuance of common stock | $ 10,000,000 |  | $ 10,000,000 |  |  |  |  |
Cash proceeds from private placement | 2,965,000 |  | 2,965,000 |  |  |  |  |
Proceeds used to cancellation of outstanding indebtedness, including accrued interest | $ 7,035,000 |  | $ 7,035,000 |  |  |  |  |
Surplus Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  |  |  | $ 25,000,000
Effective interest rate |  |  |  | 1.88% | 2.21% | 2.73% |  |
Principal repayments of Surplus Note |  |  |  | $ 368,000 |  |  |  |
Maturity year of debt instrument |  |  |  | through 2026 |  |  |  |
Net written premium to surplus ratio |  |  |  | 200.00% |  |  |  |
Gross written premium to surplus ratio |  |  |  | 600.00% |  |  |  |
Surplus Note [Member] | Hurricane [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Surplus and Reinsurance sufficient to cover in excess of UPCIC probable maximum loss |  |  |  | 1-in-100 year |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  | $ 7,000,000 |  | $ 20,000,000 |
Effective interest rate |  |  |  | 5.99% |  |  |  |
Surplus note maturity date |  |  |  | May 23, 2016 |  |  |  |
Stated interest rate on Term Loan |  |  |  | 0.50% |  |  |  |
Frequency of periodic payment description |  |  |  | Principal was paid annually on the anniversary of the closing date in three annual installments and interest was payable in arrears on the same dates as the principal payments. |  |  |  |
Term Loan is amortized |  |  |  | 3 years |  |  |  |
Amortization of discount |  |  |  | $ 149,000 | $ 521,000 | $ 840,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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