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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance ¥ 3,995,744      
Charge for the year 508,726 $ 71,615 ¥ 516,276 ¥ 492,826
Ending balance 3,553,601 500,253 3,995,744  
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 9,794,919   9,531,630  
Additions 178,876   353,348  
Disposal of subsidiary (107,785)      
Disposals (30,811)   (67,385)  
Transfers     98  
Write-off (13,764)   (29,127)  
Translation difference (507)   6,355  
Ending balance 9,820,928   9,794,919 9,531,630
Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (5,799,175)   (5,333,721)  
Charge for the year 527,556   533,777  
Disposal of subsidiary 66,674      
Disposals 24,922   61,671  
Write-off 12,033   25,832  
Impairment loss 44,667   17,278  
Translation difference (442)   1,902  
Ending balance (6,267,327)   (5,799,175) (5,333,721)
Freehold land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 14,177      
Ending balance 14,592 2,054 14,177  
Freehold land [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 14,654   13,464  
Translation difference 402   1,190  
Ending balance 15,056   14,654 13,464
Freehold land [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (477)   (457)  
Translation difference (13)   20  
Ending balance (464)   (477) (457)
Buildings and improvements [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,499,656      
Ending balance 1,401,655 197,316 1,499,656  
Buildings and improvements [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 2,610,784   2,546,285  
Additions 2,903   8,768  
Disposal of subsidiary (80,585)      
Disposals     (5,530)  
Transfers 38,506   72,252  
Write-off (2,890)   (14,827)  
Translation difference (233)   3,836  
Ending balance 2,568,485   2,610,784 2,546,285
Buildings and improvements [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (1,111,128)   (1,023,456)  
Charge for the year 92,919   101,709  
Disposal of subsidiary 44,274      
Disposals     3,166  
Write-off 2,068   11,855  
Impairment loss 9,162      
Translation difference (37)   984  
Ending balance (1,166,830)   (1,111,128) (1,023,456)
Construction in progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 334,709      
Ending balance 239,114 33,661 334,709  
Construction in progress [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 348,769   405,430  
Additions 149,846   312,442  
Transfers (244,741)   (369,120)  
Translation difference (139)   17  
Ending balance 253,735   348,769 405,430
Construction in progress [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (14,060)      
Write-off 0      
Impairment loss 561   14,060  
Ending balance (14,621)   (14,060)  
Plant and machinery [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 2,052,585      
Ending balance 1,829,082 257,487 2,052,585  
Plant and machinery [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 6,471,846   6,224,902  
Additions 18,676   13,469  
Disposal of subsidiary (21,632)      
Disposals (7,000)   (54,323)  
Transfers 201,642   288,475  
Write-off (7,474)   (1,081)  
Translation difference (197)   404  
Ending balance 6,655,861   6,471,846 6,224,902
Plant and machinery [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (4,419,261)   (4,069,642)  
Charge for the year 402,554   398,465  
Disposal of subsidiary 17,225      
Disposals 5,456   51,290  
Write-off 6,681   978  
Impairment loss 34,458   3,218  
Translation difference (132)   204  
Ending balance (4,826,779)   (4,419,261) (4,069,642)
Office furniture, fittings and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 52,342      
Ending balance 41,417 5,830 52,342  
Office furniture, fittings and equipment [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 232,329   222,380  
Additions 7,151   12,413  
Disposal of subsidiary (5,568)      
Disposals (772)   (964)  
Transfers 4,593   8,491  
Write-off (3,229)   (10,754)  
Translation difference (360)   763  
Ending balance 234,144   232,329 222,380
Office furniture, fittings and equipment [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (179,987)   (168,930)  
Charge for the year 21,568   22,005  
Disposal of subsidiary 5,175      
Disposals 687   960  
Write-off 3,123   10,559  
Impairment loss 438      
Translation difference (281)   571  
Ending balance (192,727)   (179,987) (168,930)
Motor and transport vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 42,275      
Ending balance 27,741 $ 3,905 42,275  
Motor and transport vehicles [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 116,537   119,169  
Additions 300   6,256  
Disposals (23,039)   (6,568)  
Write-off (171)   (2,465)  
Translation difference 20   145  
Ending balance 93,647   116,537 119,169
Motor and transport vehicles [member] | Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (74,262)   (71,236)  
Charge for the year 10,515   11,598  
Disposals 18,779   6,255  
Write-off 161   2,440  
Impairment loss 48      
Translation difference 21   123  
Ending balance ¥ (65,906)   ¥ (74,262) ¥ (71,236)