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Property, Plant and Equipment - Summary of Property, Plant and Equipment (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 detailed information about property, plant and equipment [Line Items]        
Beginning balance ¥ 4,127,185      
Charge for the year 431,567 $ 68,184 ¥ 465,093 ¥ 456,002
Impairment loss 20,845 3,293 3,297 2,873
Ending balance 3,824,018 604,168 4,127,185  
Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 8,058,169   7,914,527  
Additions 261,433   284,993  
Acquisition as subsidiary     29  
Disposal of subsidiary (155,850)      
Disposals (22,573)   (141,582)  
Transfers     (381)  
Write-off (73,757)   (5)  
Translation difference 4,459   588  
Ending balance 8,071,881   8,058,169 7,914,527
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 3,930,984   3,584,983  
Charge for the year 431,567   465,093  
Disposal of subsidiary (51,006)      
Disposals (18,601)   (121,857)  
Transfers     (24)  
Write-off (68,075)      
Impairment loss 20,845   3,297  
Translation difference 2,149   (508)  
Ending balance 4,247,863   3,930,984 3,584,983
Freehold land [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 13,263      
Ending balance 13,509 2,134 13,263  
Freehold land [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 13,730   13,301  
Translation difference 263   429  
Ending balance 13,993   13,730 13,301
Freehold land [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 467   460  
Translation difference 17   7  
Ending balance 484   467 460
Leasehold land, buildings and improvements [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 1,709,360      
Ending balance 1,631,418 257,752 1,709,360  
Leasehold land, buildings and improvements [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 2,351,646   2,307,160  
Additions 1,109   23,621  
Disposal of subsidiary (107,632)      
Disposals (3,310)   (16,492)  
Transfers 81,486   37,001  
Write-off (2,385)      
Translation difference 1,954   356  
Ending balance 2,322,868   2,351,646 2,307,160
Leasehold land, buildings and improvements [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 642,286   572,857  
Charge for the year 78,347   78,504  
Disposal of subsidiary (26,031)      
Disposals (1,879)   (8,720)  
Transfers     (24)  
Write-off (1,377)      
Translation difference 104   (331)  
Ending balance 691,450   642,286 572,857
Construction in progress [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 336,151      
Ending balance 280,041 44,245 336,151  
Construction in progress [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 336,151   328,117  
Additions 226,977   232,474  
Transfers (280,358)   (224,440)  
Write-off (1,674)      
Ending balance 281,096   336,151 328,117
Construction in progress [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss 1,055      
Ending balance 1,055      
Plant and machinery [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 1,960,557      
Ending balance 1,798,122 284,091 1,960,557  
Plant and machinery [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 5,049,756   4,969,820  
Additions 7,464   8,514  
Disposal of subsidiary (35,490)      
Disposals (10,064)   (114,861)  
Transfers 198,872   186,620  
Write-off (53,792)      
Translation difference 88   (337)  
Ending balance 5,156,834   5,049,756 4,969,820
Plant and machinery [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 3,089,199   2,831,362  
Charge for the year 325,979   359,046  
Disposal of subsidiary (15,040)      
Disposals (10,191)   (104,346)  
Write-off (51,087)      
Impairment loss 19,790   3,297  
Translation difference 62   (160)  
Ending balance 3,358,712   3,089,199 2,831,362
Office furniture, fittings and equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 67,630      
Ending balance 58,428 9,231 67,630  
Office furniture, fittings and equipment [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 192,461   181,448  
Additions 16,763   17,757  
Acquisition as subsidiary     29  
Disposal of subsidiary (12,473)      
Disposals (3,718)   (6,966)  
Transfers     142  
Write-off (15,307)   (5)  
Translation difference 2,228   56  
Ending balance 179,954   192,461 181,448
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 124,831   110,175  
Charge for the year 21,202   21,248  
Disposal of subsidiary (9,695)      
Disposals (1,798)   (6,514)  
Write-off (15,012)      
Translation difference 1,998   (78)  
Ending balance 121,526   124,831 110,175
Motor and transport vehicles [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 40,224      
Ending balance 42,500 $ 6,715 40,224  
Motor and transport vehicles [Member] | Cost [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 114,425   114,681  
Additions 9,120   2,627  
Disposal of subsidiary (255)      
Disposals (5,481)   (3,263)  
Transfers     296  
Write-off (599)      
Translation difference (74)   84  
Ending balance 117,136   114,425 114,681
Motor and transport vehicles [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 74,201   70,129  
Charge for the year 6,039   6,295  
Disposal of subsidiary (240)      
Disposals (4,733)   (2,277)  
Write-off (599)      
Translation difference (32)   54  
Ending balance ¥ 74,636   ¥ 74,201 ¥ 70,129