Components of Income Tax Provision (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Current tax provision
Federal	$ 0	$ 0	$ 0	$ 0
State	0	0	0	0
Foreign	3,402,482	3,016,059	8,197,780	9,280,633
Current Income Tax Expense (Benefit), Total	3,402,482	3,016,059	8,197,780	9,280,633
Deferred tax provision (benefit)
Federal	0	0	0	0
State	0	0	0	0
Foreign	830,419	0	(471,468)	0
Deferred Income Tax Expense (Benefit), Total	830,419	0	(471,468)	0
Income tax provision	$ 4,232,901	$ 3,016,059	$ 7,726,312	$ 9,280,633