v2.4.0.6

Investment in Equity Investees (Detail) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2011 Shanghai Tonghua Network Technology Co Ltd CNY | Dec. 31, 2011 Shanghai Tonghua Network Technology Co Ltd USD ($) | Dec. 31, 2011 Beijing Huayi Giant Information Technology Co. Ltd. CNY | Dec. 31, 2011 Beijing Huayi Giant Information Technology Co. Ltd. USD ($) | Dec. 31, 2011 Shanghai Juxi Network Technology Co Ltd CNY | Dec. 31, 2011 Shanghai Juxi Network Technology Co Ltd USD ($) | Dec. 31, 2011 Shanghai Juxian Network Technology Co Ltd CNY | Dec. 31, 2011 Shanghai Juxian Network Technology Co Ltd USD ($) | Dec. 31, 2011 Yunfeng Fund CNY | Dec. 31, 2011 Yunfeng Fund USD ($) | Dec. 31, 2011 Gross CNY | Dec. 31, 2010 Gross CNY | Dec. 31, 2011 Gross Shanghai Tonghua Network Technology Co Ltd CNY | Dec. 31, 2010 Gross Shanghai Tonghua Network Technology Co Ltd CNY | Dec. 31, 2011 Gross Beijing Huayi Giant Information Technology Co. Ltd. CNY | Dec. 31, 2010 Gross Beijing Huayi Giant Information Technology Co. Ltd. CNY | Dec. 31, 2011 Gross Shanghai Juxi Network Technology Co Ltd CNY | Dec. 31, 2011 Gross Shanghai Juxian Network Technology Co Ltd CNY | Dec. 31, 2011 Gross Yunfeng Fund CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments CNY | Dec. 31, 2010 Income (Loss) from Equity Method Investments CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments Shanghai Tonghua Network Technology Co Ltd CNY | Dec. 31, 2010 Income (Loss) from Equity Method Investments Shanghai Tonghua Network Technology Co Ltd CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments Beijing Huayi Giant Information Technology Co. Ltd. CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments Shanghai Juxi Network Technology Co Ltd CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments Shanghai Juxian Network Technology Co Ltd CNY | Dec. 31, 2011 Income (Loss) from Equity Method Investments Yunfeng Fund CNY
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity investees |  | 35,125,945 |  | 2,351,894 | $ 201,583 | 32,774,051 | $ 5,292,034 |  | $ 947,608 |  | $ 20,321 |  |  | $ 49,370,326 | [1] | 360,266,331 | 35,774,051 | 3,000,000 | 3,000,000 | 32,769,269 | 32,774,051 | 6,128,039 | 1,319,023 | 317,050,000 | [1] | (8,866,107) | (648,106) | (1,731,257) | (648,106) | 538,265 | (163,888) | (1,191,127) | (6,318,100) | [1]
Cost of investments |  | 324,492,280 |  |  |  | (4,782) |  | 6,128,039 |  | 1,319,023 |  | 317,050,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share of equity income | (1,305,709) | (8,218,001) | (648,106) | (1,083,151) |  | 538,265 |  | (163,888) |  | (1,191,127) |  | (6,318,100) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity investees | $ 55,831,872 | 351,400,224 | 35,125,945 | 1,268,743 | $ 201,583 | 33,307,534 | $ 5,292,034 | 5,964,151 | $ 947,608 | 127,896 | $ 20,321 | 310,731,900 | [1] | $ 49,370,326 | [1] | 360,266,331 | 35,774,051 | 3,000,000 | 3,000,000 | 32,769,269 | 32,774,051 | 6,128,039 | 1,319,023 | 317,050,000 | [1] | (8,866,107) | (648,106) | (1,731,257) | (648,106) | 538,265 | (163,888) | (1,191,127) | (6,318,100) | [1]
[1] | In September 2011, the Company invested an aggregate amount of RMB317,050,000 (US$50,374,172) as a limited partner in Yunfeng Fund, for the purpose of purchasing shares of Alibaba Group Holdings Limited (the "Alibaba Group"), China's leading e-commerce company. Yunfeng Fund has purchased ordinary shares of the Alibaba Group at a price per share of US$13.50. The term of the Yunfeng Fund is 10 years, which may be extended for additional successive one-year periods up to a maximum of two years, and may be further extended upon the written election or vote of a majority in interest of the limited partners. Given that the Company holds more than three percent interest in Yunfeng Fund and the significance of this investment, the investment is accounted for under the equity method as prescribed in ASC323-10. As of and for the year ended December 31, 2011, the total assets, liabilities and operating loss of Yunfeng fund were RMB3,051,110,433 (US$484,772,626), RMB89,687,234 (US$14,249,866) and RMB63,008,814 (US$10,011,092), respectively.

X
- Definition Increase Decrease In Investments + References No definition available. + Details
Name: | ga_IncreaseDecreaseInInvestments
Namespace Prefix: | ga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 9 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration