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Long-Term Debt - Additional Information (Detail) (USD $) | 9 Months Ended | 1 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2013 | Mar. 31, 2013 Revolving Line of Credit [Member] Deutsche Bank [Member] | Mar. 29, 2013 Revolving Line of Credit [Member] Deutsche Bank [Member] | Sep. 30, 2013 Surplus Note [Member] | Dec. 31, 2012 Surplus Note [Member] | Sep. 30, 2013 Term Loan [Member] | Sep. 30, 2013 Term Loan [Member] Installment | May 23, 2013 Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt surplus |  |  |  | $ 19,118,000 | $ 20,221,000 |  |  |
Long-term debt |  |  |  |  |  | 18,238,000 | 18,238,000 |
Unsecured line of credit, maximum borrowing capacity |  |  | 10,000,000 |  |  |  |  |
DB loan, maturity date |  | Mar. 27, 2015 |  |  |  |  |  |
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 |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  | 20,000,000 | 20,000,000 | 20,000,000
Term loan maturity date |  |  |  |  |  |  | May 23, 2016 |
Stated interest rate on Term Loan |  |  |  |  |  | 0.50% | 0.50% |
Number of installments |  |  |  |  |  |  | 3 |
Principal amount in year one |  |  |  |  |  | 6,000,000 | 6,000,000 |
Principal amount in year two |  |  |  |  |  | 7,000,000 | 7,000,000 |
Principal amount in year three |  |  |  |  |  | 7,000,000 | 7,000,000 |
Term Loan is amortized |  |  |  |  |  |  | 3 years |
Effective interest rate term loan |  |  |  |  |  | 5.99% | 5.99% |
Amortization of discount | $ 349,000 |  |  |  |  | $ 248,000 | $ 349,000 |

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