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Changes in Accumulated Other Comprehensive Income (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2012 $ 1,911,970
Other comprehensive income (loss) before reclassifications 263,019
Amounts reclassified from accumulated other comprehensive income (loss)   
Net current period other comprehensive income (loss) 263,019
Balance at September 30, 2013 2,174,989
Accumulated Net Unrealized Investment Gain (Loss)
  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2012 14,130
Other comprehensive income (loss) before reclassifications (4,345)
Amounts reclassified from accumulated other comprehensive income (loss)   
Net current period other comprehensive income (loss) (4,345)
Balance at September 30, 2013 9,785
Accumulated Translation Adjustment
  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2012 1,897,840
Other comprehensive income (loss) before reclassifications 267,364
Amounts reclassified from accumulated other comprehensive income (loss)   
Net current period other comprehensive income (loss) 267,364
Balance at September 30, 2013 $ 2,165,204