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Property and Equipment, Net - Additional Information (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Property, Plant and Equipment [Line Items]        
Depreciation expenses ¥ 45,156 $ 6,940 ¥ 46,455 ¥ 26,002