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Intangible Assets Net - Additional Information (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, amortization expenses $ 22,071 ¥ 143,602 ¥ 183,964 ¥ 184,147
Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful life of intangible assets 1 year 1 year    
Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful life of intangible assets 20 years 20 years