Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013	$ 1,998,330
Other comprehensive income/(loss) before reclassifications	(4,717,214)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income/(loss)	(4,717,214)
Balance at September 30, 2014	(2,718,884)
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013	(5,281)
Other comprehensive income/(loss) before reclassifications	45,784
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income/(loss)	45,784
Balance at September 30, 2014	40,503
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013	2,003,611
Other comprehensive income/(loss) before reclassifications	(4,762,998)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income/(loss)	(4,762,998)
Balance at September 30, 2014	$ (2,759,387)