v2.4.0.6

Subsequent Events - Additional Information (Detail) | 1 Months Ended
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Aug. 08, 2011 USD ($) | Aug. 08, 2011 CNY | Feb. 21, 2011 USD ($) | Feb. 21, 2011 CNY | Feb. 24, 2012 Dividend Declared USD ($) | Feb. 24, 2012 Dividend Declared CNY | Mar. 29, 2012 Dividend Paid | Apr. 05, 2012 Dividend Paid
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Dividend declared | $ 721,309,505 | 4,539,849,894 | $ 42,948,709 | 270,314,878 | $ 71,000,000 | 447,000,000 |  |
Dividend Rate |  |  |  |  | $ 0.30 |  |  |
Dividend payable date |  |  |  |  |  |  | Mar. 29, 2012 | Apr. 05, 2012

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- Definition Common stock dividends declared and/or paid by an entity to common shareholders. + References No definition available. + Details
Name: | ga_CommonStockDividendsDeclared
Namespace Prefix: | ga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Per share dividends declared and paid during the period for each share of common stock outstanding. + References No definition available. + Details
Name: | ga_CommonStockDividendsPerShareDeclaredAndPaid
Namespace Prefix: | ga_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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