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5. Income Taxes (Detail) - Table of Unrecognized Tax Benefits, Interest, and Penalties (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance	$ 12,026,563	$ 14,806,768
Increase (Decrease) in unrecognised tax benefits taken in current year	(2,780,205)	5,515,443	313,596
Gross Unrecognized Tax Benefits [Member]
Balance	10,129,508	12,950,686	3,427,492	3,687,082
Increase (Decrease) in unrecognised tax benefits taken in current year	(2,821,178)	9,523,194	(259,590)
Charges to Uncrecognized Tax Benefits [Member]
Balance	1,897,055	1,856,082	1,634,844	1,060,001
Increase in surcharge in current year	40,973	221,238	574,843
Net Unrecognized Tax Benefits [Member]
Balance	12,026,563	14,806,768	5,062,336	4,747,083
Increase in surcharge in current year	40,973	221,238	574,843
Increase (Decrease) in unrecognised tax benefits taken in current year	$ (2,821,178)	$ 9,523,194	$ (259,590)

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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