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Changes in Accumulated Other Comprehensive Income (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at December 31, 2013 $ 1,998,330 $ 1,857,361 $ 1,998,330
Other comprehensive income before reclassifications (140,969)    
Amounts reclassified from accumulated other comprehensive income       
Net current period other comprehensive income (140,969)    
Balance at March 31, 2014 1,857,361 1,857,361 1,998,330
Accumulated Net Unrealized Investment Gain (Loss)
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at December 31, 2013 (5,281)    
Other comprehensive income before reclassifications 2,184    
Amounts reclassified from accumulated other comprehensive income       
Net current period other comprehensive income 2,184    
Balance at March 31, 2014 (3,097)    
Accumulated Translation Adjustment
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at December 31, 2013 2,003,611    
Other comprehensive income before reclassifications (143,153)    
Amounts reclassified from accumulated other comprehensive income       
Net current period other comprehensive income (143,153)    
Balance at March 31, 2014 $ 1,860,458