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Summary of Significant Accounting Policies - Summary of Changes in Accumulated Balances of Other Comprehensive Income (Detail) (USD $) | 6 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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