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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_a&doctype=Standard -URIDate 2016-03-31 + Details
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