v2.4.0.6

DIVIDEND - Additional Information (Detail)	1 Months Ended				12 Months Ended
	Aug. 08, 2011 USD ($)	Aug. 08, 2011 CNY	Feb. 21, 2011 USD ($)	Feb. 21, 2011 CNY	Dec. 31, 2011 USD ($)	Dec. 31, 2011 CNY	Dec. 31, 2010 CNY	Dec. 31, 2009 CNY
Dividends [Line Items]
Declared Dividends	$ 721,309,505	4,539,849,894	$ 42,948,709	270,314,878
Dividend, registered date	Aug. 31, 2011	Aug. 31, 2011	Mar. 18, 2011	Mar. 18, 2011
Dividends Paid					$ 764,258,214	4,810,164,772	279,122,994	277,652,205

X

- 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

X

- Details

Name:	ga_DividendsLineItems
Namespace Prefix:	ga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 20

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration