v2.4.0.6

Significant related party transactions (Parenthetical) (Detail) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2011 Shanghai Jiante Biotechnology Co. Ltd. USD ($) | Apr. 30, 2011 Shanghai Jiante Biotechnology Co. Ltd. CNY | Dec. 31, 2011 Shanghai Jiante Biotechnology Co. Ltd. USD ($) | Dec. 31, 2011 Shanghai Jiante Biotechnology Co. Ltd. CNY | Aug. 31, 2011 Union Sky Holding Group Limited USD ($) | Aug. 31, 2011 Union Sky Holding Group Limited CNY | Dec. 31, 2011 Union Sky Holding Group Limited USD ($) | Dec. 31, 2011 Union Sky Holding Group Limited CNY
Prepayment to related parties | $ (152,337,978) | (958,800,000) | $ (152,337,978) | [1] | (958,800,000) | [1] |  |  |  |  |  |
Interest income from related parties |  |  |  |  |  |  | $ 3,411,536 | 21,471,866 | $ 3,411,536 | [1] | 21,471,866 | [1]
[1] | In April 2011, the Company made a prepayment to Shanghai Jiante, for a commitment to invest RMB958,800,000 (US$152,337,978) in Sunshine Insurance Group Corporation, Ltd., a privately held insurance company, which was due to investor sentiment, regulatory and other considerations, the Company subsequently unwound in August 2011 by transferring it to Union Sky for the full amount of the prepayment plus accrued interest of RMB21,471,866 (US$3,411,536), which was accrued from April through August 2011. Both these amounts were settled in cash in September, 2011.

X
- Definition Income derived from investments in debt securities and on cash and cash equivalents from related parties the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References No definition available. + Details
Name: | ga_InterestIncomeFromRelatedParties
Namespace Prefix: | ga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a -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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_PaymentsForAdvanceToAffiliate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration