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Commitments and Contingencies - Additional Information (Detail) ¥ in Millions, $ in Millions | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Disclosure of commitments and contingencies [line items] |  |  |
Capital commitments related to property, plant and equipment | ¥ 450.0 | $ 69.5 | ¥ 594.0
Investments commitments related to interest in joint venture | 17.6 | 2.7 | 17.6
Irrevocable letter of credits issued | ¥ 54.4 | $ 8.4 | ¥ 30.8

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- Definition Disclosure of commitments and contingencies [line items] + References No definition available. + Details
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- Definition Irrevocable letter of credits issued. + 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 2020-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 74 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_74_c&doctype=Standard -URIDate 2020-01-01 + Details
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