Long-Term Debt - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended				3 Months Ended	9 Months Ended
	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