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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, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Disclosure of income statement [Line Items]        
Depreciation and amortization expenses ¥ 444,181 $ 70,177 ¥ 478,160 ¥ 469,435
Cost of sales [Member]        
Disclosure of income statement [Line Items]        
Depreciation and amortization expenses 307,102 48,520 322,289 319,962
Research and development expenses [Member]        
Disclosure of income statement [Line Items]        
Depreciation and amortization expenses 48,291 7,630 56,812 58,204
Selling, general and administrative expenses [Member]        
Disclosure of income statement [Line Items]        
Depreciation and amortization expenses ¥ 88,788 $ 14,027 ¥ 99,059 ¥ 91,269