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Equity Investments in Investees Through Company's Subsidiaries or VIEs (Detail)
Dec. 31, 2012
Equity Method Investee Beijing Paibo Times Technology Co., Ltd.
 
Subsidiary or Equity Method Investee [Line Items]  
Percentage of equity interest in equity method investee held by the entity 32.56%
Equity Method Investee Chongqing Rongdu Technology Co., Ltd.
 
Subsidiary or Equity Method Investee [Line Items]  
Percentage of equity interest in equity method investee held by the entity 40.00%
Equity Method Investee Henan Feidian Network Technology Co., Ltd.
 
Subsidiary or Equity Method Investee [Line Items]  
Percentage of equity interest in equity method investee held by the entity 40.00%
OPDA Appublish Co., Ltd.
 
Subsidiary or Equity Method Investee [Line Items]  
Percentage of equity interest in equity method investee held by the entity 15.33%