v2.4.0.6

Short-term Investments (Parenthetical) (Detail) |  |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Aug. 31, 2009 Investment Contracts Held-to-maturity Security New China Trust CNY | Aug. 31, 2009 Investment Contracts Held-to-maturity Security New China Trust Quarterly Rate | Aug. 31, 2009 Investment Contracts Held-to-maturity Security New China Trust Annual Rate | Dec. 24, 2010 Investment Contracts Held-to-maturity Security Shanghai Lingang CNY | Dec. 24, 2010 Investment Contracts Held-to-maturity Security Anhui Hailuo CNY | Nov. 30, 2011 Zhonghang WanKe Co Ltd Held-to-maturity Security China Railway Trust USD ($) | Nov. 30, 2011 Zhonghang WanKe Co Ltd Held-to-maturity Security China Railway Trust CNY
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment contract period |  |  |  | 2 years |  |  |  |  |  |
Short Term Investments | $ 146,137,476 | 919,774,660 | 3,253,362,000 | 500,000,000 |  |  | 850,000,000 | 500,000,000 |  |
Investment yield |  |  |  |  | 1.50% | 6.00% | 4.00% | 4.20% |  |
Shares held as securities |  |  |  | 45,040,000 |  |  |  |  |  |
Investment Maturity Date |  |  |  |  |  |  | 150 days | 157 days |  |
Invested in a real estate project |  |  |  |  |  |  |  |  | $ 95,330,399 | 600,000,000
Expected annual interest rate |  |  |  |  |  |  |  |  | 13.00% | 13.00%
Investment Maturity period |  |  |  |  |  |  |  |  | 1 year | 1 year
Percentage of return on investment |  |  |  |  |  |  |  |  | 9.10% | 9.10%

X
- Definition Total number of common stock shares held in trust. + References No definition available. + Details
Name: | ga_CommonStockHeldInTrustShares
Namespace Prefix: | ga_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment Contractual Period + References No definition available. + Details
Name: | ga_InvestmentContractualPeriod
Namespace Prefix: | ga_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment Interest Rate, Percentage + References No definition available. + Details
Name: | ga_InvestmentInterestRatePercentage
Namespace Prefix: | ga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The time period from the fund establishment until the maturity of the fund. + References No definition available. + Details
Name: | ga_InvestmentMaturityPeriod
Namespace Prefix: | ga_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments in real estate + References No definition available. + Details
Name: | ga_InvestmentsInRealEstate
Namespace Prefix: | ga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Rate of Return on Alternative Investments + References No definition available. + Details
Name: | ga_RateOfReturnOnAlternativeInvestments
Namespace Prefix: | ga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short Term Investments, Maturity Period + References No definition available. + Details
Name: | ga_ShortTermInvestmentsMaturityPeriod
Namespace Prefix: | ga_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated average rate of return on investments which is included in the calculation of the amount of the specified guaranteed benefit obligation as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-1 -Section Appendix C -Paragraph 46 -Subparagraph C-1 -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 Statement of Position (SOP) -Number 03-1 -Paragraph 38 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11318-158416 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14944-158439 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14937-158439 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
Name: | us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeEstimatedAverageInvestmentYield
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ShortTermInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant