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Intangible assets, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
Finite-Lived Intangible Assets [Line Items]          
Goss carrying amount     ¥ 106,717   ¥ 562,970
Less: accumulated amortization     ¥ (9,212)   (78,287)
Less: accumulated impairment loss       (8,162)
Intangible assets, net $ 73,562   ¥ 97,505   476,521
Estimated amortization expenses          
2016         195,643
2017         160,273
2018         113,457
After 2018         7,148
Amortization expense 10,663 ¥ 69,075 ¥ 6,071 ¥ 1,990  
Impairment loss $ 1,260 ¥ 8,162  
Game Licenses [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goss carrying amount     ¥ 102,038   492,133
Game Licenses [Member] | Weighted Average [Member]          
Estimated amortization expenses          
Amortization period 2 years 9 months 18 days 2 years 9 months 18 days 2 years 7 months 6 days    
Software Licenses [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goss carrying amount     ¥ 1,639   45,262
Software Licenses [Member] | Weighted Average [Member]          
Estimated amortization expenses          
Amortization period 3 years 3 years 3 years    
Game engine [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goss carrying amount       15,905
Game engine [Member] | Weighted Average [Member]          
Estimated amortization expenses          
Amortization period 3 years 3 years    
Capitalized Costs for Internally Generated Software [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goss carrying amount     ¥ 3,040   ¥ 9,670
Capitalized Costs for Internally Generated Software [Member] | Weighted Average [Member]          
Estimated amortization expenses          
Amortization period 1 year 6 months 1 year 6 months 1 year 6 months