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Commitments and Contingencies - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of commitments and contingencies [Line Items] |  |  |  |  |
Minimum operating lease payments recognized as an expense | ¥ 54,671 | $ 8,638 | ¥ 54,617 | ¥ 60,201 |
Capital commitments related to property, plant and equipment | 409,487 |  | 427,089 |  | $ 64,696
Investments commitments related to interest in joint venture | 0 |  | 75,000 |  | 0
Irrevocable letter of credits issued | ¥ 1,905 |  | ¥ 29,729 |  | $ 301
Bottom of range [Member] |  |  |  |  |
Disclosure of commitments and contingencies [Line Items] |  |  |  |  |
Property plant and equipment, subject to or available for operating lease useful life average | 1 year | 1 year |  |  |
Top of range [Member] |  |  |  |  |
Disclosure of commitments and contingencies [Line Items] |  |  |  |  |
Property plant and equipment, subject to or available for operating lease useful life average | 5 years | 5 years |  |  |

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- Definition Irrevocable letter of credits issued. + References No definition available. + Details
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- Definition Property plant and equipment subject to or available for operating lease useful life average. + References No definition available. + Details
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- Definition The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_23_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 74 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_74_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_35_c&doctype=Standard -URIDate 2016-03-31 + Details
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