Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013	$ 1,998,330
Other comprehensive income before reclassifications	(1,593,691)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income	(1,593,691)
Balance at June 30, 2014	404,639
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	12,066
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income	12,066
Balance at June 30, 2014	6,785
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013	2,003,611
Other comprehensive income before reclassifications	(1,605,757)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income	(1,605,757)
Balance at June 30, 2014	$ 397,854