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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |  | 3 Months Ended |  |
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Mar. 31, 2014 | Mar. 31, 2014 Revolving Line of Credit [Member] Deutsche Bank [Member] | Mar. 29, 2013 Revolving Line of Credit [Member] Deutsche Bank [Member] | Mar. 31, 2014 Surplus Note [Member] | Dec. 31, 2013 Surplus Note [Member] | Mar. 31, 2014 Term Loan [Member] | Dec. 31, 2013 Term Loan [Member] | May 23, 2013 Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt surplus |  |  |  | $ 18,400,000 | $ 18,800,000 |  |  |
Long-term debt |  |  |  |  |  | 18,700,000 | 18,500,000 |
Unsecured line of credit, maximum borrowing capacity |  |  | 10,000,000 |  |  |  |  |
Unsecured line of credit, amount drawn |  | 0 |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  |  |  | 20,000,000
Amortization of discount | $ 250,000 |  |  |  |  | $ 250,000 |  |

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