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Depreciation, amortization, shipping and handling expenses - Summary of Other Operating Income (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 Information On Income Statement [line items]        
Interest income ¥ 132,083 $ 20,892 ¥ 166,970 ¥ 177,261
Dividend income from quoted equity securities 168 26 166 959
Gain on disposal of property, plant and equipment 1,224 194    
Gain on disposal of quoted equity securities 5,416 857 874 11,528
Gain on disposal of right-of-use assets 14,714 2,327 2,574 9,237
Government grants 152,932 24,190 209,793 122,371
Fair value gain on quoted equity securities 138 22   1,118
Fair value gain on foreign exchange forward contract 0 0 999  
Realised foreign exchange gain, net 0 0 1,390 3,604
Unrealised foreign exchange gain, net 0 0 1,827 4,679
Others 19,496 3,083 15,676 16,404
Other operating income ¥ 326,171 $ 51,591 ¥ 400,269 ¥ 347,161