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Long-term Investments - Additional Information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jul. 31, 2018
CNY (¥)
Jul. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Summary Of Investment Holdings [Line Items]            
Carrying amount of cost method investments           ¥ 557,524
Equity investments without readily determinable fair value ¥ 1,761,487   $ 256,198      
Accumulated impairment of equity investments without readily determinable fair value 31,500   4,581      
Unrealized gains of equity securities without readily determinable fair values 189,639 $ 27,582        
Unrealized losses of equity securities without readily determinable fair values 0 0        
Net realized gains and losses for equity securities 0 0        
Net unrealized gains and losses for equity securities 189,639 $ 27,582        
Equity method investments ¥ 810,553   $ 117,890     ¥ 10,363
Beijing Xin’ai Sports Media Technology co., LTD            
Summary Of Investment Holdings [Line Items]            
Equity method investment, ownership percentage 29.00%   29.00% 32.00% 32.00%  
Equity method investments       ¥ 796,000 $ 115,773  
Basis differences and investment goodwill       ¥ 609,502 $ 88,648