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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, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of income statement [line items]        
Amortization of intangible assets ¥ 1,012 $ 156 ¥ 1,012  
Amortization of prepaid operating lease       ¥ 12,724
Depreciation of investment property 376 58 380 884
Depreciation of property, plant and equipment 450,092 69,552 422,859 420,277
Depreciation of right-of-use assets 43,127 [1] 6,664 [1] 40,958  
Depreciation and amortization expenses 494,607 76,430 465,209 433,885
Cost of sales [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 327,866 50,664 315,445 312,769
Research and development expenses [Member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 26,815 4,144 16,470 26,751
Selling general and administrative expenses [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses ¥ 139,926 $ 21,622 ¥ 133,294 ¥ 94,365
[1] In 2020, COVID-19 related rent rebate received from lessors of RMB 0.2 million (less than US$ 0.1 million) has been offset against the depreciation of right-of-use assets.