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Long-Term Debt - Additional Information (Detail) (USD $)
 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Mar. 31, 2013
Revolving Line of Credit [Member]
Deutsche Bank [Member]
Mar. 29, 2013
Revolving Line of Credit [Member]
Deutsche Bank [Member]
Jun. 30, 2013
Term Loan [Member]
Jun. 30, 2013
Term Loan [Member]
Installment
May 23, 2013
Term Loan [Member]
Debt Instrument [Line Items]              
Long-term debt surplus $ 19,500,000 $ 20,200,000          
Long-term debt         18,000,000 18,000,000  
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  
Effective interest rate payable in arrears         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 $ 101,000       $ 101,000 $ 101,000