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Goodwill - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 242,446,000us-gaap_Goodwill 1,504,278,000us-gaap_Goodwill 1,504,278,000us-gaap_Goodwill
Goodwill, impairment loss $ 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss