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Share-Based Compensation - Expenses Recorded by Group (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses ¥ 73,316 $ 11,268 ¥ 306,149 ¥ 315,740
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses 762 117 1,490 1,523
Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses 20,691 3,180 148,211 142,777
Selling and Marketing Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses 39 6 13,830 18,206
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expenses ¥ 51,824 $ 7,965 ¥ 142,618 ¥ 153,234