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Depreciation, amortization, shipping and handling expenses - Summary of Depreciation and Amortization (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Disclosure of income statement [line items]        
Amortization of intangible assets ¥ 38,957 $ 6,162 ¥ 1,012 ¥ 1,012
Depreciation of investment property 355 56 376 380
Depreciation of property, plant and equipment 492,826 77,952 450,092 422,859
Depreciation of right-of-use assets 41,458 6,558 43,127 [1] 40,958 [1]
Depreciation and amortization expenses 573,596 90,728 494,607 465,209
Cost of sales [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 381,248 60,303 327,866 315,445
Research and development expenses [Member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses 41,835 6,618 26,815 16,470
Selling general and administrative expenses [member]        
Disclosure of income statement [line items]        
Depreciation and amortization expenses ¥ 150,513 $ 23,807 ¥ 139,926 ¥ 133,294
[1] In 2020, COVID-19 related rent rebate received from lessors of RMB 0.2 million has been offset against the depreciation of right-of-use assets.