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Summary of Significant Accounting Policies - Summary of Changes in Accumulated Balances of Other Comprehensive Income (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balances as of December 31, 2013	$ (11,159)
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income	11,159
Net current period other comprehensive income	(44,966)
Balances as of June 30, 2014	(56,125)
Balances as of December 31, 2013	(87,455,970)
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income	(25,467)	(759,565)
Net current period other comprehensive income	(16,005,233)
Balances as of June 30, 2014	(103,461,203)
Unrealized Gains on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balances as of December 31, 2013	36,626
Amount of gain (loss) reclassified from accumulated other comprehensive income to net income	(36,626)
Net current period other comprehensive income	141,393
Balances as of June 30, 2014	178,019
Foreign Currency Translation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balances as of December 31, 2013	(87,481,437)
Net current period other comprehensive income	(16,101,660)
Balances as of June 30, 2014	(103,583,097)
Available-for-sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income before reclassification adjustments for gains on available for sale investments	(56,125)
Other comprehensive income before reclassification adjustments for gains on available for sale investments	(15,979,766)
Available-for-sale Securities [Member] | Unrealized Gains on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income before reclassification adjustments for gains on available for sale investments	178,019
Available-for-sale Securities [Member] | Foreign Currency Translation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income before reclassification adjustments for gains on available for sale investments	$ (16,101,660)

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Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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