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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Depreciation and Amortization (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Disclosure of income statement [line items]        
Depreciation and amortization expenses $ 64,855 ¥ 433,885 ¥ 444,181 ¥ 478,160
Cost of sales [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 46,751 312,769 307,102 322,289
Research and development expenses [Member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 3,999 26,751 48,291 56,812
Selling general and administrative expenses [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses $ 14,105 ¥ 94,365 ¥ 88,788 ¥ 99,059