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Summary of Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Estimated tax loss on unrealized gains on investments $ (8,775,055) $ (7,828,800)
Reclassification out of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications for the period 25,467  
Accumulated Net Realized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains on investments 36,626  
Estimated tax loss on unrealized gains on investments $ (11,159)