v2.4.0.6

Summary Of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2011 USD ($) Year Entity Segment | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY Entity | Dec. 31, 2009 CNY Entity | Dec. 31, 2010 USD ($) | Dec. 31, 2008 CNY | Dec. 31, 2011 Land Use Rights Year | Dec. 31, 2011 Minimum | Dec. 31, 2010 Minimum | Dec. 31, 2009 Minimum | Dec. 31, 2011 Maximum | Dec. 31, 2011 Business Tax | Dec. 31, 2011 VAT and related surcharges | Dec. 31, 2011 Advertising Expense USD ($) | Dec. 31, 2011 Advertising Expense CNY | Dec. 31, 2010 Advertising Expense CNY | Dec. 31, 2009 Advertising Expense CNY | Dec. 31, 2010 KOK3 game software CNY | Dec. 31, 2009 KOK3 game software CNY | Dec. 31, 2011 Mr Yuzhu Shi | Dec. 31, 2011 Capital Lease Obligations | Dec. 31, 2011 Non Employee | Dec. 31, 2010 Non Employee | Dec. 31, 2009 Non Employee | Feb. 13, 2008 Stock Repurchase Plan 1 American Depositary Share USD ($) | Dec. 24, 2007 Stock Repurchase Plan 1 American Depositary Share USD ($) | Dec. 31, 2008 Stock Repurchase Plan 1 American Depositary Share USD ($) | Dec. 31, 2007 Stock Repurchase Plan 1 American Depositary Share USD ($) | Aug. 11, 2008 Stock Repurchase Plan 2 American Depositary Share USD ($) | Dec. 31, 2009 Stock Repurchase Plan 2 American Depositary Share USD ($) | Dec. 31, 2008 Stock Repurchase Plan 2 American Depositary Share USD ($) | Aug. 31, 2009 Stock Repurchase Plan 3 American Depositary Share USD ($) | Sep. 30, 2011 Stock Repurchase Plan 4 American Depositary Share USD ($) | Dec. 31, 2011 Stock Repurchase Plan 4 American Depositary Share USD ($) | Dec. 31, 2011 Stock Repurchase Plan 4 American Depositary Share CNY | Dec. 31, 2011 Online Game Product Development Costs | Dec. 31, 2011 Online Game Product Development Costs Minimum | Dec. 31, 2011 Online Game Product Development Costs Maximum | Dec. 31, 2011 Salvage Value | Dec. 31, 2009 Shenzhen Tencent Computer Systems Company Limited Year | Dec. 31, 2011 Shanghai Giant Network Technology Co Ltd USD ($) | Dec. 31, 2011 Shanghai Giant Network Technology Co Ltd CNY | Dec. 31, 2010 Shanghai Giant Network Technology Co Ltd CNY | Dec. 31, 2009 Shanghai Giant Network Technology Co Ltd CNY | Dec. 31, 2011 Shanghai Giant Network Technology Co Ltd Contract Termination CNY | Dec. 31, 2011 Shanghai Zhengtu Information Technology Co.Ltd USD ($) | Dec. 31, 2011 Shanghai Zhengtu Information Technology Co.Ltd CNY | Dec. 31, 2010 Shanghai Zhengtu Information Technology Co.Ltd CNY | Dec. 31, 2009 Shanghai Zhengtu Information Technology Co.Ltd CNY | Dec. 31, 2011 Group's VIE subsidiary | Dec. 31, 2011 Hangzhou Snow Wolf Software Co Ltd Online software game Year | Dec. 31, 2011 Beijing Julun Network Information Technology Co Ltd Online software game Year | Dec. 31, 2011 Resources SZITIE Trust Co Ltd Held-to-maturity Security | Dec. 31, 2011 Resources SZITIE Trust Co Ltd Held-to-maturity Security Minimum | Dec. 31, 2011 Resources SZITIE Trust Co Ltd Held-to-maturity Security Maximum | Dec. 31, 2011 China Railway Trust Held-to-maturity Security
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue for upfront and royalty fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of game series |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination notice period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |
Penalty fee payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Technical and consulting services and software licenses fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 234,000,000 | 1,474,000,000 | 1,135,000,000 | 989,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of the option to purchase equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,588,840 | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,675,742 | 73,485,950 | 127,393,934 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112,248,055 | 706,478,031 | 587,825,321 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112,309,542 | 706,865,023 | 574,594,639 |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in cash and cash equivalents | (290,219,942) | (1,826,615,294) | 1,679,781,053 | (599,117,587) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 213,222,000 | 1,342,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 150,990,805 | 950,321,028 | 2,776,936,322 | 1,097,155,269 | 441,210,747 | 1,696,272,856 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,872,000 | 93,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments | 55,831,872 | 351,400,224 | 35,125,945 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,291,000 | 33,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,089,000 | 579,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112,315,000 | 706,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noon buying currency exchange rate at Federal Reserve Bank of New York, USD to RMB |  | 6.2939 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents maturity period |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short term investments maturity period |  |  |  |  |  |  |  | 90 days |  |  | 365 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of estimated residual value of Fixed assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, capitalization cost | 5,402,000 | 34,002,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Method of amortization of Purchased software | Amortization is computed using the straight-line method over three years. | Amortization is computed using the straight-line method over three years. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of Purchased software | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |
Number of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |
Impairment of intangible assets |  |  | 46,557,669 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,557,669 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment losses |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land use rights agreements, term |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid card expiration period | 2 years | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of prepaid card return policy | The Group has implemented a return policy for distributors to return cards that are unsold six months after purchased from the Group. | The Group has implemented a return policy for distributors to return cards that are unsold six months after purchased from the Group. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Online Software Cooperation Agreement, Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business tax and related surcharges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  | 5.00% |  |  |  |  |  |
Business tax and surcharges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,665,622 | 111,185,658 | 85,019,261 | 72,701,726 |  |  |  |  |  |  |
Percentage of taxes and other charges included in cost of services |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business tax, VAT and related surcharges | 11,567,548 | 72,804,988 | 37,192,656 | 39,066,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing | 27,007,347 | 169,981,540 | 143,006,150 | 119,600,377 |  |  |  |  |  |  |  |  |  | 16,732,000 | 105,308,000 | 65,297,000 | 31,426,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options issued | 60,000 | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | For the lessee, a lease is a capital lease if any of the following conditions exist: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of estimated remaining economic life for lease term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value of leased property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit | 7,062,636 | 44,451,522 | 14,758,798 | 9,955,138 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized to be repurchased, ADSs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchased during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,484,100 |  | 16,055,000 | 1,429,100 |  |  |  |  |  | 932,972 | 932,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of share repurchased during the period | 337,235,151 | 2,122,524,316 | 2,176,792,033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  | 182,700,000 | 17,300,000 |  |  |  |  |  | 3,648,097 | 22,960,759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of share to be repurchased additionally |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchased during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,570,785 | 14,947,200 |  | 932,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of share repurchased during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200,000 | $ 97,800,000 |  | $ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment expected yield (net) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 14.00% | 19.50% | 9.10%
Investment maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Percentage of group's revenue derived from a single online game |  |  |  |  |  |  |  | 90.00% | 90.00% | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer represented 10% or more of net sales | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of the U.S. dollar against RMB | 3.30% | 3.30% | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Appreciation or Depreciation of Functional Currency of Entity and its Subsidiaries and VIEs Against Reporting Currency by Percentage + References No definition available. + Details
Name: | ga_AppreciationOrDepreciationOfFunctionalCurrencyOfEntityAndItsSubsidiariesAndVIEsAgainstReportingCurrencyByPercentage
Namespace Prefix: | ga_
Data Type: | num:percentItemType
Balance Type: | na
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